stderr undeclared identifier
c
Solution
While stdio.h should work, sometimes you need to include stdlib.h as well. Include the following:
#include <stdio.h>
#include <stdlib.h>
Declare both of these includes at the TOP of the same .C file your argmatch_valid function above is defined.
My crystal ball suggests that the stdio.h you think you are including is getting wrapped by a comment or within another preprocessor section that is getting wiped out. Maybe you can post your entire source file. Someone will likely spot the real error.
Problem
``` void argmatch_valid (const char *const *arglist, const char *vallist, size_t valsize) { size_t i; const char *last_val = NULL; fprintf (stderr, _("Valid arguments are:")); for (i = 0; arglist[i]; i++) if ((i == 0)|| memcmp (last_val, vallist + valsize * i, valsize)) { fprintf (stderr, "\n - `%s'", arglist[i]); last_val = vallist + valsize * i; } else { fprintf (stderr, ", `%s'", arglist[i]); } putc ('\n', stderr); } ``` I am getting the following although I have included stdio.h in my .c file ``` warning C4013: 'fprintf' undefined; assuming extern returning int error C2065: 'stderr' : undeclared identifier warning C4013: 'putc' undefined; assuming extern returning int ``` I thought of disabling the warning by #pragma warning( disable :4013 ) but wanted to compile the code clean. Thanks in advance