putc(3S)                         DG/UX 5.4.2                        putc(3S)


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

SYNOPSIS
       #include <stdio.h>

       int putc (int c, FILE *stream);

       int putchar (int c);

       int fputc (int c, FILE *stream);

       int putw (int w, FILE *stream);

DESCRIPTION
       putc writes c (converted to an unsigned char) onto the output stream
       [see intro(3)] at the position where the file pointer (if defined) is
       pointing, and advances the file pointer appropriately.  If the file
       cannot support positioning requests, or stream was opened with append
       mode, the character is appended to the output stream.  putchar(c) is
       defined as putc(c, stdout).  putc and putchar are macros.

       fputc behaves like putc, but is a function rather than a macro.
       fputc runs more slowly than putc, but it takes less space per
       invocation and its name can be passed as an argument to a function.

       putw writes the word (i.e., integer) w to the output stream (where
       the file pointer, if defined, is pointing).  The size of a word is
       the size of an integer and varies from machine to machine.  putw
       neither assumes nor causes special alignment in the file.

SEE ALSO
       exit(2), lseek(2), write(2), abort(3C), fclose(3S), ferror(3S),
       fopen(3S), fread(3S), printf(3S), puts(3S), setbuf(3S), stdio(3S).

DIAGNOSTICS
       On success, these functions (with the exception of putw) each return
       the value they have written.  putw returns ferror (stream).  On
       failure, they return the constant EOF.  This result will occur, for
       example, if the file stream is not open for writing or if the output
       file cannot grow.

NOTES
       Because it is implemented as a macro, putc evaluates a stream
       argument more than once.  In particular, putc(c, *f++); doesn't work
       sensibly.  fputc should be used instead.

       Because of possible differences in word length and byte ordering,
       files written using putw are machine-dependent, and may not be read
       using getw on a different processor.

       Functions exist for all the above defined macros.  To get the
       function form, the macro name must be undefined (e.g., #undef putc).




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