PUTC(3) BSD Programmer's Manual PUTC(3)
fputc, putc, putchar, putw - output a character or word to a stream
fputc(int c, FILE *stream);
putc(int c, FILE *stream);
putw(int w, FILE *stream);
The fputc() function writes the character c (converted to an ``unsigned
char'') to the output stream pointed to by stream.
Putc() acts essentially identically to fputc(), but is a macro that ex-
pands in-line. It may evaluate stream more than once, so arguments given
to putc() should not be expressions with potential side effects.
Putchar() is identical to putc() with an output stream of stdout.
The putw() function writes the specified int to the named output stream.
The functions, fputc(), putc() and putchar() return the character writ-
ten. If an error occurs, the value EOF is returned. The putw() function
returns 0 on success; EOF is returned if a write error occurs, or if an
attempt is made to write a read-only stream.
ferror(3), fopen(3), getc(3), stdio(3)
The functions fputc(), putc(), and putchar(), conform to ANSI C
X3.159-1989 (``ANSI C ''). A function putw() function appeared in Version
6 AT&T UNIX.
The size and byte order of an int varies from one machine to another, and
putw() is not recommended for portable applications.
4.4BSD June 4, 1993 1