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fputc, putc

From cppreference.com
< c‎ | io
 
 
File input/output


Functions
File access
Direct input/output
Unformatted input/output
fputc
(until C11)(since C11)
(C95)(C95)
(C95)
(C95)(C95)
(C95)
(C95)
Formatted input
Formatted output
File positioning
Error handling
Operations on files
 

Defined in header <stdio.h>
int fputc( int ch, FILE *stream );
int putc( int ch, FILE *stream );

Writes a character ch to the given output stream stream. putc() may be implemented as a macro and evaluation 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.

Contents

[edit] Parameters

ch - character to be written
stream - output stream

[edit] Return value

On success, returns the written character.

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

[edit] Example

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)
       if (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

  • C11 standard (ISO/IEC 9899:2011):
  • 7.21.7.3 The fputc function (p: 331)
  • 7.21.7.7 The putc function (p: 333)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.19.7.3 The fputc function (p: 297)
  • 7.19.7.8 The putc function (p: 299)
  • C89/C90 standard (ISO/IEC 9899:1990):

[edit] See also

writes a character to stdout
(function) [edit]
C++ documentation for fputc, putc