PUTC(3S)                COMMAND REFERENCE                PUTC(3S)



NAME
     putc, putchar, fputc, putw - put character or word on a
     stream

SYNOPSIS
     #include <stdio.h>

     int putc(c, stream)
     char c;
     FILE *stream;

     putchar(c)

     fputc(c, stream)
     FILE *stream;

     putw(w, stream)
     FILE *stream;

DESCRIPTION
     putc appends the character c to the named output stream.  It
     returns the character written.

     putchar(c) is defined as putc(c, stdout).

     fputc behaves like putc, but is a genuine function rather
     than a macro.

     putw appends word (that is, int) w to the output stream.  It
     returns the word written.  putw neither assumes nor causes
     special alignment in the file.

DIAGNOSTICS
     These functions return the constant EOF upon error.  Since
     this is a good integer, ferror(3s) should be used to detect
     putw errors.

CAVEATS
     Because it is implemented as a macro, putc treats a stream
     argument with side effects improperly.  In particular

          putc(c, *f++);

     doesn't work sensibly.

     Errors can occur long after the call to putc.

     The de facto standard for both putc and fputc is to return
     EOF when an attempt is made to output the character with the
     value 255. If this character must be output, change the
     definition of _ptr in the iobuf structure in the file
     /usr/include/stdio.h from char * to unsigned char *.  Be



Printed 3/13/89                                                 1

PUTC(3S)                COMMAND REFERENCE                PUTC(3S)



     aware that this change may break existing software that uses
     these functions.

SEE ALSO
     fopen(3s), fclose(3s), getc(3s), puts(3s), printf(3s), and
     fread(3s).

















































Printed 3/13/89                                                 2

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