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puts(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ATTRIBUTES \|STANDARDS \|HISTORY \|BUGS \|SEE ALSO \|COLOPHON

puts(3)                  Library Functions Manualputs(3)

NAME top

       fputc, fputs, putc, putchar, puts - output of characters and       strings

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <stdio.h>int fputc(intc, FILE *stream);int putc(intc, FILE *stream);int putchar(intc);int fputs(const char *restricts, FILE *restrictstream);int puts(const char *s);

DESCRIPTION top

fputc() writes the characterc, cast to anunsigned char, tostream.putc() is equivalent tofputc() except that it may be implemented       as a macro which evaluatesstream more than once.putchar(c) is equivalent toputc(c, stdout).fputs() writes the strings tostream, without its terminating       null byte ('\0').puts() writes the strings and a trailing newline tostdout.       Calls to the functions described here can be mixed with each other       and with calls to other output functions from thestdio library       for the same output stream.       For nonlocking counterparts, seeunlocked_stdio(3).

RETURN VALUE top

fputc(),putc(), andputchar() return the character written as anunsigned char cast to anint orEOFon error.puts() andfputs() return a nonnegative number on success, orEOF       on error.

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │fputc(),fputs(),putc(),putchar(), │ Thread safety │ MT-Safe │       │puts()                               │               │         │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       C11, POSIX.1-2008.

HISTORY top

       POSIX.1-2001, C89, C99.

BUGS top

       It is not advisable to mix calls to output functions from thestdio library with low-level calls towrite(2) for the file       descriptor associated with the same output stream; the results       will be undefined and very probably not what you want.

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17puts(3)

Pages that refer to this page:curs_addch(3x), curs_termcap(3x), curs_terminfo(3x), fgetc(3), flockfile(3), fputwc(3), fputws(3), gets(3), getw(3), printf(3), putwchar(3), setbuf(3), stdio(3)