PUTC(3) BSD Programmer's Manual PUTC(3)
fputc, putc, putchar, putw - output a character or word to a stream
#include <stdio.h> int fputc(int c, FILE *stream); int putc(int c, FILE *stream); int putchar(int c); int 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 w 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 X3.159-1989 ("ANSI C"). A function putw() function appeared in Version 6 AT&T UNIX.
Since the size and byte order of an int may vary from one machine to another, putw() is not recommended for portable applications. MirOS BSD #10-current June 4, 1993 1
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