putchar
Defined in header <stdio.h> | ||
|---|---|---|
int putchar( int ch );
|
Writes a character ch to stdout. Internally, the character is converted to unsigned char just before being written.
Equivalent to putc(ch, stdout).
Parameters
| ch | - | character to be written |
Return value
On success, returns the written character.
On failure, returns EOF and sets the error indicator (see ferror()) on stdout.
Example
putchar 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 = putchar(c);
/* Test whether EOF was reached. */
if (ret_code == EOF)
if (ferror(stdout))
{
fprintf(stderr,"putchar() failed in file %s at line # %d\n", __FILE__,__LINE__-6);
perror("putchar()");
exit(EXIT_FAILURE);
}
putchar('\n');
// putchar return value is not equal to the argument
int r = 0x1070;
printf("\n0x%x\n", r);
r = putchar(r);
printf("\n0x%x\n", r);
}Output:
abcdefghijklmnopqrstuvwxy 0x1070 p 0x70
References
- C11 standard (ISO/IEC 9899:2011):
- 7.21.7.8 The putchar function (p: 333)
- C99 standard (ISO/IEC 9899:1999):
- 7.19.7.9 The putchar function (p: 299)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.9.7.9 The putchar function
See also
| writes a character to a file stream (function) |
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