plgstrm: Get current stream number

`plgstrm`: Get current stream number
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#### `plgstrm`: Get current stream number

`plgstrm (` | p_strm`)`;

Gets the number of the current output stream. See also `plsstrm`.

`p_strm` (``PLINT_NC_SCALAR``, output)

  Returned value of the current stream value.

Redacted form: `plgstrm(p_strm)`

This function is used in example 1,20.

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