# Manual de gcalctool

gcalctool is a calculator for GNOME. It includes basic, advanced, financial, and scientific modes and uses a multiple precision package to do its arithmetic to give a high degree of accuracy.

2003
2004
2005
Sun Microsystems
Projècte de documentacion de GNOME

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License (GFDL), Version 1.1 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. You can find a copy of the GFDL at this link or in the file COPYING-DOCS distributed with this manual.

This manual is part of a collection of GNOME manuals distributed under the GFDL. If you want to distribute this manual separately from the collection, you can do so by adding a copy of the license to the manual, as described in section 6 of the license.

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Sun Microsystems Inc.
Calculator Manual V2.9
Març de 2005

Sun Java Desktop System Documentation Team

Projècte de documentacion de GNOME

Calculator Manual V2.8
Agost de 2004

Sun Java Desktop System Documentation Team

Projècte de documentacion de GNOME

gcalctool Manual V2.7
Febrièr de 2004

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.6
Octòbre de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.5
Julhet de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.4
Junh de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.3
Abril de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.2
Abril de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.1
Març de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

gcalctool Manual V2.0
Març de 2003

Còla Sun de documentacion de GNOME

Projècte de documentacion de GNOME

This manual describes version 5.5.37 of Calculator.

## Feedback

To report a bug or make a suggestion regarding the gcalctool application or this manual, follow the directions in the GNOME Feedback Page.

## Introduccion

The gcalctool application provides the following modes for different types of mathematical functionality:

Basic

  The default mode. Provides standard calculator functions. You can perform standard addition, subtraction, division, and multiplication functions in Basic mode and you can use all of the Basic functions in each of the other modes.

A_vançat

  Provides advanced calculator functions. You can store numbers in 10 different memory registers, and easily retrieve and replace the numbers in the memory registers. You can use all of the Advanced functions in Financial, Scientific and Programming modes.

Financièr

  Provides several complex financial functions.

Scientific

  Provides many additional mathematical functions, including trigonometric functions. You can also store your own functions and constants, when you use Scientific mode.

Programming

  Provides functions useful to a programmer, including bitwise functions and a bit editor.

You can use gcalctool in the following numbering systems:

Numbering System | Basa
--- | ---
Binari | 2
Octal | 8
Decimal | 10
Hexadecimal | 16

## Per començar

You can start gcalctool in the following ways:

Menut

  Choose Accessories Calculator.

Linha de comanda

  Execute the following command: `gnome-calculator`

When you start gcalctool, the following window is displayed:

### gcalctool Basic Mode Window

Shows gcalctool Basic mode window.

The gcalctool window contains the following elements:

Barra de menuts

  The menus on the menubar contain all of the commands that you need to work with gcalctool.

Display area

  The display area shows the numbers that you enter, and the results of calculations.

Mode area

  The mode area displays the buttons for the current mode. The Basic mode buttons are always displayed. Advanced mode buttons are also available in Financial, Scientific and Programming modes.

Popup Menu

  The Shows popup-menu symbol. symbol on a gcalctool button indicates that a popup menu is displayed when you click on that button.

Barra d'estat

  The status bar displays messages on the status of your calculations.

## Utilizacion

### To Use Calculator Functions

To perform a calculation, use one of the following methods:

- Click on the gcalctool buttons to enter numbers and functions.

- Give focus to the gcalctool window, then use the keyboard or numeric keypad to specify the calculation that you want to perform. For a complete list of keyboard shortcuts, see .

The gcalctool application automatically displays numbers with more than 40 digits, and small numbers, as exponential numbers. For example, the following table shows the value that is displayed when you use the decimal numeric base with an accuracy of 2 significant places:

Visualizar | Signifies
--- | ---
1.23e+37 | 1.23 * 1037
1e-5 | 0,00001

For information about how to enter a number in exponential format, see .

#### To Display a Separator in Large Numbers

To insert a separator between every three digits to the left of the numeric point in decimal base, choose View Show Thousands Separator.

Different countries and cultures have varying conventions for how to communicate. These conventions include the language spoken and the character used as a numeric separator.

gcalctool has been internationalized so users can adapt to their own conventions. This is done by setting a specific locale. We can't determine what locales will exist, except for a standard one called the C locale.

When you use the C locale, the separator character is not displayed.

#### To Copy and Paste in the Display Area

To copy the result of a calculation, choose Edit Copy. You can paste the value into another application.

To paste a previously copied value into the display area, choose Edit Paste.

### To Perform Basic Calculations

Basic mode is displayed by default when you first start gcalctool. To explicitly invoke Basic mode, choose View Basic.

The calculator memory registers are unavailable in Basic Mode. In other words, View Memory Registers is inactive.

#### To Perform Simple Calculations

To perform simple calculations, use the buttons described in .

##### Performing Simple Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Numerals | 0 to 9 inclusive | In decimal and hexadecimal base, all numerals are available. In octal base, 8 and 9 are unavailable. In binary base, only 0 and 1 are available. The default base is decimal. | 1 | 1
Numeric point | . | Starts the fractional part of a numeric entry. | 1 . 2 | 1,2
Calculate a result | = | Displays the result of the current calculation in the current base. | 1 + 2 = | 3
Adicion | + | Adds the current value in the display area to the next number that you enter. | 1 + 2 = | 3
Sostraccion | - | Subtracts from the current value in the display area the next number that you enter. | 3 - 2 = | 1
Multiplicacion | * | Multiplies the current value in the display area by the next number that you enter. | 3 * 2 = | 6
Division | / | Divides the current value in the display area by the next number that you enter. | 6 / 3 = | 2
Change the arithmetic sign | +/- | Changes a positive number to a negative number, or a negative number to a positive number. | 8 +/- | -8

#### To Erase Characters

To erase characters, use the buttons described in .

##### Erasing Characters

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Retorn enrèire | Bksp | Removes the rightmost character from the display area. | 1 + 2 2 Bksp = | 3
Clear Entry | CE | Removes the current value from the display area. This operation is the same as Clr | 1 + 2 2 CE = | 0
Netejar | Clr | Resets the current value in the display area to zero and removes any previous calculation results. Clr also deselects the Hyp and Inv options in Scientific. | 1 + 2 2 Clr | 0

#### To Display ASCII Values

To display the ASCII value of a character, choose Edit Insert ASCII Value .

The Insert ASCII Value dialog is displayed.

Enter the required character in the Character field, then click Insert. The ASCII value of that character, in the current numeric base, appears in the display area. For example, the ASCII value of B in decimal base is 66.

### To Perform Advanced Calculations

To change to Advanced mode, choose View Advanced .

When you change to Advanced mode, the following buttons are displayed to the right of the Basic mode buttons:

#### gcalctool Advanced Mode Buttons

Shows gcalctool Advanced mode buttons.

#### Performing Advanced Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Percentatge | % | Divides the current value by 100. | 560 % = | 5,60
Reciprocal | 1/x | Divides 1 by the current value in the display area. | 4 1/x | 0,25
Square Root | Sqrt | Calculates the square root of the current value in the display area. | Sqrt 9 )= | 3
Carrat | x2 | Calculates the square of the current value in the display area. | 3 x2 | 9
Integer Portion | Int | Calculates the integer portion of the current value in the display area. | -23.45 Int | -23
Fractional Portion | Frac | Calculates the fractional portion of the current value in the display area. | -23.45 Frac | -0,45
Absolute Value | Abs | Calculates the absolute value of the current value in the display area. | -23.45 Abs | 23,45
Parentheses | ( and ) | Calculations within parentheses are performed first. You can nest parentheses to any level. | 2 + 3 * 4 = 2 + ( 3 * 4 ) | 20 14

#### To Use the Calculator Memory Registers

You can store values in any of the ten gcalctool memory registers R0 to R9. To display the memory registers, choose View Memory Registers .

The memory registers can be dismissed by either choosing View Memory Registers again, or by clicking on the Close button in the memory register window.

describes the memory functions that you can use.

##### Memory Functions

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---

Store Value in Memory Register

Sto

Stores the current contents of the display area in the specified memory register. Click Sto, then select a memory register from the popup menu.

To clear a memory register during a gcalctool session:

1. Click Clr.

2. Click Sto.

3. Select the memory register from the popup menu.

22 Sto R2

The value 22 is stored in memory register R2.

Retrieve Value From Memory Register | Rcl | Retrieves the contents of the specified memory register. Click Rcl, then select the memory register from the popup menu. | 0 Rcl R2 | The value in the display area is 22.
Exchange Memory Register Value and Displayed Value | Exch | Exchanges the contents of the specified memory register and the current value in the display area. Click Exch, then select the memory register from the popup menu. | 44 Exch R2 | The value in the display area changes from 44 to 22, the value in R2 changes from 22 to 44.

If you use keyboard shortcuts, you can use the keyboard to specify the memory register, as shown in the following examples:

Keyboard Entry | Descripcion
--- | ---
E 2 | Stores the current contents of the display area in memory register R2.
R 2 | Retrieves the current contents of memory register R2 into the display area.
X 2 | Exchanges the current value of the display area with the contents of memory register R2.

### To Perform Financial Calculations

To change to Financial mode, choose View Financial .

When you change to Financial mode, the following buttons are displayed above the Basic and Advanced mode buttons:

#### gcalctool Financial Mode Buttons

Shows gcalctool Financial mode buttons.

To perform financial calculations, use the buttons described in .

#### Performing Financial Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---

Compounding Term

Ctrm

Calculates the number of compounding periods necessary to increase an investment from a present value to a future value, at a fixed interest rate per compounding period.

You have just deposited $8000 in an account that pays an annual interest rate of 9%, compounded monthly. Given the annual interest rate, you determine that the simple monthly interest rate is 0.09 / 12 = 0.0075. To calculate the time period necessary to double your investment, click Ctrm, and put the following values into the text entries:

Periodic Interest Rate

  0,0075

Future Value

  16000

Present Value

  8000

Click Calculate

92,77

The investment doubles in value in 92.77 months.

Double-Declining Depreciation

Ddb

Calculates the depreciation allowance on an asset for a specified period of time, using the double-declining balance method.

You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900. To calculate the depreciation expense for the fourth year, using the double-declining balance method, click Ddb and put the following values into the text entries:

Cost

  8000

Salvage

  900

Life

  6

Period

  4

Click Calculate

790,12

The depreciation expense for the fourth year is $790.12.

Future Value

Fv

Calculates the future value of an investment based on a series of equal payments at a specific periodic interest rate, over the number of payment periods in the term.

You plan to deposit $4000 in a bank account on the last day of each year for the next 20 years. The account pays 8% interest, compounded annually. Interest is paid on the last day of each year. To calculate the value of your account in 20 years, press Fv and put the following values into the text entries:

Periodic Payment

  4000

Periodic Interest Rate

  0,08

Number Of Periods

  20

Click Calculate

183047,86

At the end of 20 years, the value of the account is $183,047.86.

Gross Profit Margin

Gpm

Calculates the resale price of a product, based on the product cost and the wanted gross profit margin.

You sell T-Shirts online. Each T-Shirt cost you $12 in material and labor. You want to sell the T-Shirts with a Gross Profit Margin of 0.40 - for every five dollars you earn, you want two to be profit. To calculate the price you would have to sell your T-Shirts for, press Gpm and put the following values into the text entries:

Cost

  12

Margin

  0.40

Click Calculate

20

You will have to sell your T-Shirts for $20

Periodic Payment

Pmt

Calculates the amount of the periodic payment of a loan, where payments are made at the end of each payment period.

You are considering a $120,000 mortgage for 30 years at an annual interest rate of 11.0%. Given the annual interest rate, you determine that the simple monthly interest rate is 0.11 / 12 = 0.00917. The term is 30 * 12 = 360 months. To calculate the monthly repayment for this mortgage, press Pmt and put the following values into the text entries:

Principal

  120000

Periodic Interest Rate

  0,00917

Term

  360

Click Calculate

1143,15

The monthly repayment is $1143.15.

Present Value

Pv

Calculates the present value of an investment based on a series of equal payments, discounted at a periodic interest rate, over the number of payment periods in the term.

You have just won a million dollars. The prize is awarded in 20 annual payments of $50,000 each. Annual payments are received at the end of each year. If you were to accept the annual payments of $50,000, you would invest the money at a rate of 9%, compounded annually.

However, you are given the option of receiving a single lump-sum payment of $400,000 instead of the million dollars annuity. To calculate which option is worth more in today's dollars, press Pv and put the following values into the text entries:

Periodic Payment

  50000

Periodic Interest Rate

  0,09

Number Of Periods

  20

Click Calculate

456427,28

The $1,000,000 paid over 20 years is worth $456,427.28 in present dollars.

Periodic Interest Rate

Taus

Calculates the periodic interest necessary to increase an investment of a present value to a future value, over a number of compounding periods.

You have invested $20,000 in a bond. The bond matures in five years, and has a maturity value of $30,000. Interest is compounded monthly. The term is 5 * 12 = 60 months. To calculate the periodic interest rate for this investment, press Rate and put the following values into the text entries:

Future Value

  30000

Present Value

  20000

Term

  60

Click Calculate

,00678

The monthly interest rate is 0.678%. The annual interest rate is 0.678% * 12 = 8.14%.

Straight-Line Depreciation

Sln

Calculates the straight-line depreciation of an asset for one period. The depreciable cost is cost - salvage. The straight-line method of depreciation divides the depreciable cost evenly over the useful life of an asset. The useful life is the number of periods, typically years, over which an asset is depreciated.

You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900. To calculate the yearly depreciation expense, using the straight-line method, prss Sln, and put the following values into the first three memory registers:

Cost

  8000

Salvage

  900

Life

  6

Click Calculate

1183,33

The yearly depreciation expense is $1183.33.

Sum-Of-The-Years'-Digits Depreciation

Syd

Calculates the depreciation allowance on an asset for a specified period of time, using the Sum-Of-The-Years'-Digits method. This method of depreciation accelerates the rate of depreciation, so that more depreciation expense occurs in earlier periods than in later ones. The depreciable cost is cost - salvage. The useful life is the number of periods, typically years, over which an asset is depreciated.

You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900. To calculate the depreciation expense for the fourth year, using the sum-of-the-years'-digits method, press Syd, and put the following values into the text entries:

Cost

  8000

Salvage

  900

Life

  6

Period

  4

Click Calculate

1014,29

The depreciation expense for the fourth year is $1014.29.

Payment Period

Term

Calculates the number of payment periods that are necessary during the term of an ordinary annuity, to accumulate a future value, at a certain periodic interest rate.

You plan to deposit $1800 in a bank account on the last day of each year. The account pays 11% interest, compounded annually. Interest is paid on the last day of each year. To calculate the time period necessary to accumulate $120,000, press Term, and put the following values into the text entries:

Periodic Payment

  1800

Future Value

  120000

Periodic Interest Rate

  0,11

Click Calculate

20,32

$120,000 accumulates in the account in 20.32 years.

### To Perform Scientific Calculations

To change to Scientific mode, choose View Scientific .

When you change to Scientific mode, the following buttons are displayed above the Basic and Advanced mode buttons:

#### gcalctool Scientific Mode Buttons

Shows gcalctool Scientific mode buttons.

#### To Set the Accuracy

To set the accuracy of the display area and of the memory registers, click Acc, then select from the popup menu the accuracy level that you require. The current accuracy level is indicated by a preceding black circle in the popup menu. Up to 99 significant places can be displayed. The default accuracy is 9 significant places.

To set the accuracy level above 9, select Other (9) ..., then choose the accuracy level you require in the Set Precision popup.

By default, trailing zeroes are not shown. To display trailing zeroes, click Acc then select Show Trailing Zeroes from the popup menu, or choose View Show Trailing Zeroes . A preceding check mark in the Acc popup menu or View menu indicates that the Show Trailing Zeroes option has been selected. To hide trailing zeroes, choose View Show Trailing Zeroes again.

The examples in the following table show how the accuracy setting affects x in the display area, when you use decimal base, with the Show Trailing Zeroes option selected, for the `1 / 8 = x` calculation:

Precision | Resulta
--- | ---
1 decimala significativa | 1,2
2 decimalas significativas | 1,25
3 decimalas significativas | 1,250

#### To Set the Display Type

To set the display type, select one of the buttons described in .

##### Setting the Display Type

Foncion | Boton | Descripcion
--- | --- | ---
Engineering Display Type | Eng | Sets the display type to engineering format. Results are displayed in scientific notation. The exponent is always a multiple of three.
Fixed-Point Display Type | Fix | Sets the display type to fixed-point format. Results are not displayed in scientific notation. Fixed-point is the default display type. If you change from scientific mode to either basic mode or financial mode, gcalctool automatically sets the display type to fixed-point format.
Scientific Display Type | Sci | Sets the display type to scientific format. Results are displayed in scientific notation, with a fixed number of numeric digits.

#### To Set the Trigonometric Type

To set the trigonometric type, select one of the buttons described in .

##### Setting the Trigonometric Type

Foncion | Boton | Descripcion
--- | --- | ---
Grases | Grases | Sets the trigonometric type to degrees. Degrees is the default trigonometric type.
Gradians | Gradians | Sets the trigonometric type to gradians.
Radians | Radians | Sets the trigonometric type to radians.

#### To Set the Trigonometric Options

To set the trigonometric options, use the options described in .

##### Setting the Trigonometric Options

Foncion | Boton | Descripcion
--- | --- | ---
Hyperbolic Option Indicator | Hyp | Selects the hyperbolic option for use with the trigonometric functions.
Inverse Option Indicator | Inv | Selects the inverse option for use with the trigonometric functions.

By default, the options described in are not selected. Click Clr to deselect these options.

#### To Calculate Trigonometric Values

To calculate trigonometric values, use the buttons described in .

##### Calculating Trigonometric Values

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Cosine `cos` | Cos, Hyp option not selected, Inv option not selected | Calculates the cosine of the current value in the display area. | 60 Cos | 0,5
Arc Cosine `acos` | Cos, Hyp option not selected, Inv option selected | Calculates the arc cosine of the current value in the display area. | 0.5 Inv Cos | 60
Hyperbolic Cosine `cosh` | Cos, Hyp option selected, Inv option not selected | Calculates the hyperbolic cosine of the current value in the display area. | 0.4 Hyp Cos | 1,081072372
Arc Hyperbolic Cosine `acosh` | Cos, Hyp option selected, Inv option selected | Calculates the arc hyperbolic cosine of the current value in the display area. | 1.6 Hyp Inv Cos | 1,046967915
Sine `sin` | Sin, Hyp option not selected, Inv option not selected | Calculates the sine of the current value in the display area. | 90 Sin | 1
Arc Sine `asin` | Sin, Hyp option not selected, Inv option selected | Calculates the arc sine of the current value in the display area. | 1 Inv Sin | 90
Hyperbolic Sine `sinh` | Sin, Hyp option selected, Inv option not selected | Calculates the hyperbolic sine of the current value in the display area. | 0.4 Hyp Sin | 0,410752326
Arc Hyperbolic Sine `asinh` | Sin, Hyp option selected, Inv option selected | Calculates the arc hyperbolic sine of the current value in the display area. | 1.6 Hyp Inv Sin | 1.248983328
Tangent `tan` | Tan, Hyp option not selected, Inv option not selected | Calculates the tangent of the current value in the display area. | 45 Tan | 1
Arc Tangent `atan` | Tan, Hyp option not selected, Inv option selected | Calculates the arc tangent of the current value in the display area. | 1 Inv Tan | 45
Hyperbolic Tangent `tanh` | Tan, Hyp option selected, Inv option not selected | Calculates the hyperbolic tangent of the current value in the display area. | 0.6 Hyp Tan | 0.537049567
Arc Hyperbolic Tangent `atanh` | Tan, Hyp option selected, Inv option selected | Calculates the arc hyperbolic tangent of the current value in the display area. | 0.6 Hyp Inv Tan | 0,693147181

#### To Calculate Logarithms

To calculate logarithms, use the buttons described in .

##### Calculating Logarithms

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Common Logarithm Base 10 | Log10 | Calculates the common logarithm (base 10) of the current value in the display area. | 10 Log10 | 1
Natural Logarithm | Ln | Calculates the natural logarithm of the current value in the display area. | 10 Ln | 2,30
Common Logarithm Base 2 | Log2 | Calculates the common logarithm (base 2) of the current value in the display area. | 10 Log2 | 3,32

Common antilogarithm and natural antilogarithm are not supported in this version of gcalctool.

#### To Enter Exponential Numbers

To enter exponential numbers, use the Exp button.

The Exp button enables you to enter numbers in scientific notation, that is, mantissa * baseexponent:

mantissa

  Current non-zero value in the display area. If the current value in the display area is zero, the mantissa is 1.0.

base

  2, 8, 10, or 16 for binary, octal, decimal, and hexadecimal numeric base respectively.

exponent

  Next number that you enter.

When you click Exp, the calculator displays `. +` to represent base to the power of the next number that you enter.

To change the sign of the number, use the +/- button before the Exp button. To change the sign of the exponent (the power to which the number is raised) use - after the Exp button.

To enter a decimal number in exponential format, use the guidelines in the following table:

Nombre | Enter | Number Displayed
--- | --- | ---
1200000000 | 12 Exp + 8 = | 1200000000
-1200000000 | - 12 Exp + 8 = | -1200000000
0,00000012 | 12 Exp - 8 = | 1.2e-7
-0,00000012 | - 12 Exp - 8 = | -1.2e-7

#### To Use Constant Values

Click Con to display the list of defined constant values. All constant values are specified in decimal numeric base, even if the current numeric base is not decimal.

Select a constant from the menu to enter its value in the display area. If you use the keyboard shortcut #, you can use the keyboard to specify the constant, as shown in the following example:

Keyboard Entry | Contrast
--- | ---
# 3 | C3

The gcalctool application provides ten default constant values, as described in the following table:

Nombre | Valor | Descripcion
--- | --- | ---
C0 | 0,621 | Kilometer-to-mile conversion factor Multiply the current value in the display area by this constant, to convert from kilometers per hour to miles per hour. For example, 8 * Con C0 = 5. Divide the current value in the display area by this constant, to convert from miles per hour to kilometers per hour. For example, 5 / Con C0 = 8.
C1 | 1,414213562 | Square root of 2
C2 | 2,718281828 | e
C3 | 3,141592653 | pi
C4 | 0,3937007 | Centimeter-to-inch conversion factor Multiply the current value in the display area by this constant, to convert from centimeters to inches. For example, 30 * Con C4 = 12. Divide the current value in the display area by this constant, to convert from inches to centimeters. For example, 12 / Con C4 = 30.
C5 | 57,295779513 | Degrees in a radian
C6 | 1048576 | 2 ^ 20
C7 | 0,0353 | Gram-to-ounce conversion factor Multiply the current value in the display area by this constant, to convert from grams to ounces. For example, 500 * Con C7 = 18. Divide the current value in the display area by this constant, to convert from ounces to grams. For example, 18 / Con C7 = 500.
C8 | 0,948 | Kilojoule-to-British-thermal-unit conversion factor Multiply the current value in the display area by this constant, to convert from kilojoules to British thermal units. For example, 10 * Con C8 = 9.48. Divide the current value in the display area by this constant, to convert from British thermal units to kilojoules. For example, 9.48 / Con C8 = 10.
C9 | 0,061 | Cubic-centimeter-to-cubic-inch conversion factor Multiply the current value in the display area by this constant, to convert from cubic centimeters to cubic inches. For example, 100 * Con C9 = 6.10. Divide the current value in the display area by this constant, to convert from cubic inches to cubic centimeters. For example, 6.10 / Con C9 = 100.

You can overwrite the default constants to store your own constants.

To store a new constant or edit an existing constant, perform the following steps:

1. Click Con, then select Edit Constants from the popup menu.

2. In the Edit Constants dialog, select the constant that you want to overwrite or edit.

3. Click on the Value field, then enter the new value.

4. Click on the Description field, then enter the new description.

5. Click OK to save your changes and close the Edit Constants dialog.

#### To Use Functions

To show the available functions, click Fun. A popup menu displays the list of defined functions. Select a function from the menu to run that function.

If you use the keyboard shortcut F, you can use the keyboard to specify the function, as shown in the following example:

Keyboard Entry | Foncion
--- | ---
F 3 | F3

The gcalctool application does not provide any default functions. You can store up to ten functions.

To store a new function or edit an existing function, perform the following steps:

1. Click Fun, then select Edit Functions from the popup menu.

2. In the Edit Functions dialog, select a blank entry, or the function that you want to overwrite.

3. Click on the Value field, then enter the new equation to solve. You can use "ans" for the result of the previous equation and "R5" for register 5 etc. For example, enter `(-R1+sqrt(R1^2-4*R0*R2))/(2*R0)` to calculate a root of the quadratic equation R0*x^2 + R1*x + R2 = 0.

4. Click on the Description field, then enter the new description. For example, `Quadratic Solver`.

5. Click OK to save your changes and close the Edit Functions dialog.

#### To Perform Miscellaneous Scientific Calculations

To perform miscellaneous scientific calculations, use the buttons described in .

##### Performing Miscellaneous Scientific Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
e to the x power | ex | Calculates the value of `e` raised to the power of the current value in the display area. | 2 ex | 7,39
10 to the x power | 10x | Calculates the value of 10 raised to the power of the current value in the display area. | 2 10x | 100
2 to the x power | 2x | Calculates the value of 2 raised to the power of the current value in the display area. | 2 2x | 4
x to the y power | xy | Raises the current value in the display area to the power of the next value that you enter. | 2 xy 4 = | 16
x to the reciprocal y power | x1/y | Raises the current value in the display area to the reciprocal power of the next value that you enter. | 2 x1/y 4 = | 16
x Factorial | x! | Calculates the factorial of the current value in the display area. x factorial is x*(x-1)*(x-2)...*1. This function applies only to positive integers. | 4 x! | 24
Modulus Division | Mod | Divides the current integer value in the display area by the next integer number that you enter, displaying the remainder. | 15 Mod 4 = | 3
Random Number Generator | Rand | Generates a random number in the range 0.0 to 1.0 then displays the random number in the display area. | Rand | 0,14

### To Perform Programming Calculations

To change to Programming mode, choose View Programming .

When you change to Programming mode, the following widget is displayed above the Base and Advanced mode buttons:

#### gcalctool Programming Mode Buttons

Shows gcalctool Programming mode buttons.

#### To Set the Numeric Base

To set the numeric base, select one of the buttons described in .

##### Setting the Numeric Base

Foncion | Boton | Descripcion
--- | --- | ---
Binary Base | Bin | Sets the numeric base to binary, that is, base 2.
Octal Base | Oct | Sets the numeric base to octal, that is, base 8.
Decimal Base | Dec | Sets the numeric base to decimal, that is, base 10. Decimal is the default numeric base. If you change from Programming mode to another mode, gcalctool automatically sets the numeric base to decimal.
Hexadecimal Base | Exa | Sets the numeric base to hexadecimal, that is, base 16.

#### To Set the Word Length

The word length can be altered, to make the bitwise functions behave differently. To set the word length, select one of the buttons described in .

##### Setting the Word Length

Foncion | Boton | Descripcion
--- | --- | ---
64 bit word | 64 bit | Sets the word length to 64 bits. 64 bits is the default word length.
32 bit word | 32 bit | Sets the word length to 32 bits.
16 bit word | 16 bit | Sets the word length to 16 bits.

#### To Perform Bit Manipulations on Integers

If the calculator display shows an integer value, then each of the bits in that integer value is displayed as a collection of 0s and 1s in the Bit Editor. By clicking on any of these individual bits, their value can be toggled, causing the displayed integer value to be adjusted accordingly.

#### To Perform Bitwise Calculations

To perform bitwise calculations, use the buttons described in .

##### Performing Bitwise Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Bitwise OR | O | Performs a bitwise OR operation on the current value in the display area and the next number that you enter. | 10001000 O 00010001 | 10011001
Bitwise AND | AND | Performs a bitwise AND operation on the current value in the display area and the next number that you enter. | 10101010 E 00110011 | 100010
Bitwise NOT | NOT | Performs a bitwise NOT operation on the current value in the display area, using the word size configured in . | NOT 1357ACE | FECA8531
Bitwise XOR | XOR | Performs a bitwise XOR operation on the current value in the display area and the next number that you enter. | 1100 XOR 1010 | 110
Bitwise XNOR | XNOR | Performs a bitwise XNOR operation on the current value in the display area and the next number that you enter. | 1100 XNOR 1010 | 1001

#### To Manipulate Binary Numbers

To manipulate binary numbers, use the buttons described in .

##### Manipulating Binary Numbers

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Left Shift n | < | Shifts the current value in the display area, the specified number of places to the left. Click <, then select the number of shift places from the popup menu. The number can be shifted up to 15 places left. | 111 < 1 place | 1110
Right Shift n | > | Shifts the current value in the display area, the specified number of places to the right. Click >, then select the number of shift places from the popup menu. The number can be shifted up to 15 places right. | 1011 > 1 place | 101
Truncating a number | Trunc | Truncates the current value in the display area to the word size configured in . | FFFFFFFFFF Trunc | FFFFFFFF
Get the 1's complement | 1's | Calculates the 1's complement for the current value in the display area, using the word size configured in . | D723 1's | FFFF28DC
Get the 2's complement | 2's | Calculates the 2's complement for the current value in the display area, using the word size configured in . | D723 2's | FFFF28DD

If you use keyboard shortcuts, you can use the keyboard to specify the number of places to shift, as shown in the following examples:

Keyboard Entry | Descripcion
--- | ---
< 4 | Shifts the current binary value in the display area 4 places to the left.
> 4 | Shifts the current binary value in the display area 4 places to the right.

#### To Perform Miscellaneous Programming Calculations

To perform miscellaneous programming calculations, use the buttons described in .

##### Performing Miscellaneous Programming Calculations

Foncion | Boton | Descripcion | Exemple | Resulta
--- | --- | --- | --- | ---
Hexadecimal Numerals | A to F inclusive | These numerals are available in hexadecimal base only. | B | B

### To Undo and Redo

To undo your previous action, choose Edit Undo . You can undo up to 15 past actions.

If you want to redo an action you have just undone, choose Edit Redo . You can redo up to 15 undone actions.

### To Quit

To quit gcalctool, choose Calculator Quit .

When you quit gcalctool, the current values of the following settings are stored and automatically applied the next time you start gcalctool:

- Mode: Basic, Advanced, Financial, or Scientific

- Precision

- Memory Registers window displayed or not displayed, plus the contents of each memory register

- Numeric base

- Display type

- Trigonometric type

- Show Trailing Zeroes

- Show Thousands Separator

## Technical Information

### Error Conditions

If you perform an invalid calculation, gcalctool indicates the error condition as follows:

- Displays the word `Error` in the display area.

- Displays an error message in the status bar.

- Makes all calculator buttons unavailable, except Clr.

- Makes all calculator options unavailable.

- Makes all calculator menu items unavailable, except Calculator Quit and Help Contents.

To clear the error condition, click Clr or press Shift Delete.

### Changing Modes

If the user tries to change modes when a partial calculation is being displayed, a warning dialog is displayed, telling the user that the current calculation will be cleared, and the base will be reset to decimal.

There is a checkbox present, that if checked, prevents the dialog from being shown again.

If the user presses the Cancel button, the change mode operation is cancelled. If the user presses the Change Mode button, the mode is changed and has the following side-effects:

- Clears the display.

- Sets the base to decimal.

- Sets the numeric display to fixed.

- Sets the accuracy to nine places after the numeric point.

- Clears the display of the thousands separator.

- Clears the display of trailing zeroes after the numeric point.

- Dismisses the register window if the new mode is Basic.

### Changing The Display Area

It is possible to use the mouse to click on the display area and edit it.

All the normal keyboard shortcuts will work, plus the addition of:

- Ctrl Delete which will delete the character to the right of the text cursor

- Home which moves the text cursor to the beginning of the display area

- End which moves the text cursor to the end of the display area

## Quick Reference: Keyboard Shortcuts

, , and provide a quick reference for all of the gcalctool keyboard shortcuts.

When you use the keyboard shortcut for any of the calculator buttons that have a menu associated with them, that menu is displayed. You can then use the arrow keys to select a menu item or the menu item's shortcut.

### Quick Reference for Keyboard Shortcuts of gcalctool Buttons

Keyboard Shortcut | Boton | Foncion | See
--- | --- | --- | ---
0 to 9 inclusive | 0 to 9 inclusive | Numerals |
A | Acc | Precision |
a | A | Hexadecimal numerals |
b | B | Hexadecimal numerals |
C | +/- | Change the arithmetic sign |
c | C | Hexadecimal numerals |
D | Ddb | Double-declining depreciation |
d | D | Hexadecimal numerals |
E | Exp | Exponential |
e | E | Hexadecimal numerals |
F | Fun | Foncion |
f | F | Hexadecimal numerals |
G | 10x | 10 to the x power |
g | Log | Common base 10 logarithm |
H | 2x | 2 to the x power |
h | Log2 | Common base 2 logarithm |
I | Gpm | Gross Profit Margin |
i | Int | Integer portion |
J | Cos-1 | Inverse Cosine |
j | Cos | Cosinus |
K | Sin-1 | Inverse Sine |
k | Sin | Sinus |
l | Sln | Straight-line depreciation |
M | Mod | Modulus Division |
m | Ctrm | Compounding term |
N | ex | e to the x power |
n | Ln | Natural logarithm |
O | x1/y | x to the reciprocaly power |
o or ^ | xy | x to the y power |
P | Pmt | Periodic payment |
p | Pv | Present value |
R | Rcl | Retrieve value from memory register |
r | 1/x | Reciprocal |
E | Sto | Store value in memory register |
s | Sqrt | Square root |
T | Taus | Periodic interest rate |
t | Term | Payment period |
u | Abs | Absolute value |
v | Fv | Future value |
W | Tan-1 | Inverse Tan |
w | Tan | Tan |
X | Exch | Exchange memory register value and displayed value |
x | Xor | Bitwise XOR |
O | Syd | Sum-of-the-years'-digits depreciation |
Z | 2's | 2's complement |
z | 1's | 1's complement |
! | x! | x factorial |
# | Con | Constant value |
% | % | Percentatge |
& | E | Bitwise AND |
( and ) | ( and ) | Parentheses |
* | * | Multiplicacion |
+ | + | Adicion |
- | - | Sostraccion |
. | . | Numeric point |
/ | / | Division |
: | Frac | Fractional portion |
< | < | Left shift n |
= or Return | = | Calculate a result |
> | > | Right shift n |
? | Rand | Random number generator |
@ | x2 | Carrat |
{ | Xnor | Bitwise XNOR |
[ | Trunc | Truncates the number |
| | O | Bitwise OR |
~ | Not | Bitwise NOT |
Retorn enrèire | Bksp | Retorn enrèire |
Esc or Ctrl Retorn enrèire | CE | Clear entry |
Shift Suprimir | Clr | Netejar |

### Quick Reference for Keyboard Shortcuts of gcalctool Scientific Mode Options

Keyboard Shortcut | Opcion | Foncion | See
--- | --- | --- | ---
Alt 1 | 16 bit | Set the word size to 16 bits. |
Alt 3 | 32 bit | Set the word size to 32 bits. |
Alt 6 | 64 bit | Set the word size to 64 bits. |
Alt a | Gradians | Set the trigonometric type to gradians. |
Alt b | Bin | Set the numeric base to binary. |
Alt d | Dec | Set the numeric base to decimal. |
Alt f | Fix | Set the display type to fixed-point format. |
Alt g | Grases | Set the trigonometric type to degrees. |
Alt i | Inv | Select the inverse option for use with the trigonometric functions. |
Alt n | Eng | Set the display type to engineering format. |
Alt o | Oct | Set the numeric base to octal. |
Alt r | Radians | Set the trigonometric type to radians. |
Alt s | Sci | Set the display type to scientific format. |
Alt x | Exa | Set the numeric base to hexadecimal. |
Alt y | Hyp | Select the hyperbolic option for use with the trigonometric functions. |

### Quick Reference for Keyboard Shortcuts of gcalctool Menu Items

Keyboard Shortcut | Menu Item | Foncion | See
--- | --- | --- | ---
Ctrl b | Visualizacion Basic | Change to Basic mode |
Ctrl c | Edicion Copiar | Copy the current value in the display area to the clipboard |
Ctrl f | Visualizacion Financièr | Change to Financial mode |
Ctrl h | Ajuda Ensenhador | Display the gcalctool online help |
Ctrl i | Edicion Inserir una valor ASCII | Display the Insert ASCII Value dialog |
Ctrl k | Visualizacion Show Thousands Separator | Display the thousands separator |
Ctrl m | Visualizacion Memory Registers | Display the Memory Registers window |
Ctrl p | Visualizacion Programming | Change to Programming mode |
Ctrl q | Calculeta Quitar | Quit the gcalctool application |
Ctrl s | Visualizacion Scientific | Change to Scientific mode |
Ctrl t | Visualizacion Show Trailing Zeroes | Show trailing zeroes |
Ctrl v | Edicion Pegar | Paste the current value in the clipboard to the display area |
Ctrl z | Edicion Undo | Undo previous action |
Shift Ctrl z | Edicion Redo | Redo an undone action |