NAME

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

USAGE

#include <stdio.h>
 
int putc(c, stream) char c; FILE *stream;
 
putchar(c)
 
fputc(c, stream) char c; FILE *stream;
 
putw(w, stream) FILE *stream;

DESCRIPTION

The macro 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 function rather than a macro. 

Putw appends word (i.e., int) w to the output stream. It returns the word written. Putw neither assumes nor causes special alignment in the file. 

NOTES

Because it is implemented as a macro, putc treats a stream argument with side effects improperly.  In particular, “putc(c, *f++);” doesn’t work correctly. 

An error generated by a putc call can appear long after the erroneous call is executed. 

DIAGNOSTICS

These functions return the constant EOF upon error.  Since this is a good integer, you must use ferror(3S) to detect putw errors. 

RELATED INFORMATION

fopen(3S), fclose(3S), getc(3S), puts(3S), printf(3S), fread(3S)