Writes a character ch to the given output stream stream. putc() may be implemented as a macro and evaluate stream more than once, so the corresponding argument should never be an expression with side effects.
Internally, the character is converted to unsigned char just before being written.
[edit] Parameters ch - character to be written stream - output stream [edit] Return valueOn success, returns the written character.
On failure, returns EOF and sets the error indicator (see ferror()) on stream.
Shows putc with error checking
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int ret_code = 0;
for (char c = 'a'; (ret_code != EOF) && (c != 'z'); c++)
ret_code = putc(c, stdout);
// Test whether EOF was reached.
if (ret_code == EOF && ferror(stdout))
{
perror("putc()");
fprintf(stderr, "putc() failed in file %s at line # %d\n",
__FILE__, __LINE__ - 7);
exit(EXIT_FAILURE);
}
putc('\n', stdout);
return EXIT_SUCCESS;
}
Output:
abcdefghijklmnopqrstuvwxy[edit] References
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