Library /sys$common/syshlp/helplib.hlb  —  CRTL  putwc  Description
    Since putwc might be implemented as a macro, a file pointer
    argument with side effects (for example putwc (wc, *f++)) might
    be evaluated incorrectly. In such a case, use the fputwc function
    instead.

    See also fputwc.
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