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putchar

From cppreference.com
< c‎ | io
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).

Contents

[edit] Parameters

ch - character to be written

[edit] Return value

On success, returns the written character.

On failure, returns EOF and sets the error indicator (see ferror()) on stdout.

[edit] 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

[edit] See also

writes a character to a file stream
(function) [edit]
C++ documentation for putchar