FreeBSD man pages : putchar (3)
PUTC(3) FreeBSD Library Functions Manual PUTC(3)
fputc, putc, putchar, putw - output a character or word to a stream
Standard C Library (libc, -lc)
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.
The putc() macro acts essentially identically to fputc(), but is a macro
that expands in-line. It may evaluate stream more than once, so argu-
ments given to putc() should not be expressions with potential side
The putchar() macro is identical to putc() with an output stream of
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 ISO/IEC
9899:1990 (``ISO C89''). 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.
FreeBSD 4.8 June 4, 1993 FreeBSD 4.8