The PLplot Plotting Library: Programmer's Reference Manual
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### `plgver`: Get the current library version number

`plgver` (p_ver);

Get the current library version number. Note: you must have allocated space for this (80 characters is safe).

`p_ver` (`char *`, output) Pointer to the current library version number.

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`plgstrm`: Get current stream number | Up | `plgvpd`: Get viewport limits in normalized device coordinates