putc — put a byte on a stream
#include <stdio.h>
int putc(int c, FILE *stream);
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.The putc() function shall be equivalent to fputc(), except that if it is implemented as a macro it may evaluate stream more than once, so the argument should never be an expression with side-effects.
Refer to fputc .
Refer to fputc .
None.
Since it may be implemented as a macro, putc() may treat a stream argument with side-effects incorrectly. In particular, putc(c,*f++) does not necessarily work correctly. Therefore, use of this function is not recommended in such situations; fputc() should be used instead.
None.
None.
2.5 Standard I/O Streams , fputc
XBD <stdio.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0470 [14] is applied.
return to top of page