plgver: Get the current library version number

`plgver`: Get the current library version number
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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` (``PLCHAR_NC_VECTOR``, output)

  Returned ascii character string (with preallocated length of 80 characters or more) containing the PLplot version number.

Redacted form: `plgver(p_ver)`

This function is used in example 1.

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