1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)putc.3 8.1 (Berkeley) 06/04/93 11.\" 12.Dd 13.Dt PUTC 3 14.Os 15.Sh NAME 16.Nm fputc , 17.Nm putc , 18.Nm putchar , 19.Nm putw 20.Nd output a character or word to a stream 21.Sh SYNOPSIS 22.Fd #include <stdio.h> 23.Ft int 24.Fn fputc "int c" "FILE *stream" 25.Ft int 26.Fn putc "int c" "FILE *stream" 27.Ft int 28.Fn putchar "int c" 29.Ft int 30.Fn putw "int w" "FILE *stream" 31.Sh DESCRIPTION 32The 33.Fn fputc 34function 35writes the character 36.Fa c 37(converted to an ``unsigned char'') 38to the output stream pointed to by 39.Fa stream . 40.Pp 41.Fn Putc 42acts essentially identically to 43.Fn fputc , 44but is a macro that expands in-line. It may evaluate 45.Fa stream 46more than once, so arguments given to 47.Fn putc 48should not be expressions with potential side effects. 49.Pp 50.Fn Putchar 51is identical to 52.Fn putc 53with an output stream of 54.Em stdout . 55.Pp 56The 57.Fn putw 58function 59writes the specified 60.Em int 61to the named output 62.Fa stream . 63.Sh RETURN VALUES 64The functions, 65.Fn fputc , 66.Fn putc 67and 68.Fn putchar 69return the character written. 70If an error occurs, the value 71.Dv EOF 72is returned. 73The 74.Fn putw 75function 76returns 0 on success; 77.Dv EOF 78is returned if 79a write error occurs, 80or if an attempt is made to write a read-only stream. 81.Sh SEE ALSO 82.Xr ferror 3 , 83.Xr fopen 3 , 84.Xr getc 3 , 85.Xr stdio 3 86.Sh STANDARDS 87The functions 88.Fn fputc , 89.Fn putc , 90and 91.Fn putchar , 92conform to 93.St -ansiC . 94A function 95.Fn putw 96function appeared in 97.At v6 . 98.Sh BUGS 99The size and byte order of an 100.Em int 101varies from one machine to another, and 102.Fn putw 103is not recommended for portable applications. 104