Format
#include <stdio.h>
int putc(int c, FILE *stream);
int putchar(int c);Language Level: ANSI
Threadsafe: No. #undef putc or #undef putchar allows the putc or putchar function to be called instead of the macro version of these functions. The functions are threadsafe.
Description
The putc() function converts c to unsigned char and then writes c to the output stream at the current position. The putchar() is equivalent to putc(c, stdout).
The putc() function can be defined as a macro so the argument can be evaluated multiple times.
The putc() and putchar() functions are not supported for files opened with type=record.
Return Value
The putc() and putchar() functions return the character written. A return value of EOF indicates an error.
The value of errno may be set to:
Example that uses putc()
This example writes the contents of a buffer to a data stream. In this example, the body of the for statement is null because the example carries out the writing operation in the test expression.
#include <stdio.h>
#include <string.h>
#define LENGTH 80
int main(void)
{
FILE *stream = stdout;
int i, ch;
char buffer[LENGTH + 1] = "Hello world";
/* This could be replaced by using the fwrite routine */
for ( i = 0;
(i < strlen(buffer)) && ((ch = putc(buffer[i], stream)) != EOF);
++i);
}
/******************** Expected output: **************************
Hello world
*/Related Information