1PUTS(3)                    Linux Programmer's Manual                   PUTS(3)
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NAME

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

9       #include <stdio.h>
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11       int fputc(int c, FILE *stream);
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13       int fputs(const char *s, FILE *stream);
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15       int putc(int c, FILE *stream);
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17       int putchar(int c);
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19       int puts(const char *s);
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DESCRIPTION

22       fputc() writes the character c, cast to an unsigned char, to stream.
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24       fputs()  writes  the  string  s to stream, without its terminating null
25       byte ('\0').
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27       putc() is equivalent to fputc() except that it may be implemented as  a
28       macro which evaluates stream more than once.
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30       putchar(c) is equivalent to putc(c, stdout).
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32       puts() writes the string s and a trailing newline to stdout.
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34       Calls  to the functions described here can be mixed with each other and
35       with calls to other output functions from the  stdio  library  for  the
36       same output stream.
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38       For nonlocking counterparts, see unlocked_stdio(3).
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RETURN VALUE

41       fputc(),  putc(),  and putchar() return the character written as an un‐
42       signed char cast to an int or EOF on error.
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44       puts() and fputs() return a nonnegative number on success,  or  EOF  on
45       error.
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ATTRIBUTES

48       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
49       tributes(7).
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51       ┌──────────────────────────┬───────────────┬─────────┐
52       │Interface                 │ Attribute     │ Value   │
53       ├──────────────────────────┼───────────────┼─────────┤
54       │fputc(), fputs(), putc(), │ Thread safety │ MT-Safe │
55       │putchar(), puts()         │               │         │
56       └──────────────────────────┴───────────────┴─────────┘

CONFORMING TO

58       POSIX.1-2001, POSIX.1-2008, C89, C99.
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BUGS

61       It is not advisable to mix calls to output functions from the stdio li‐
62       brary with low-level calls to write(2) for the file descriptor  associ‐
63       ated  with  the  same  output stream; the results will be undefined and
64       very probably not what you want.
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SEE ALSO

67       write(2),  ferror(3),   fgets(3),   fopen(3),   fputwc(3),   fputws(3),
68       fseek(3), fwrite(3), putwchar(3), scanf(3), unlocked_stdio(3)
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COLOPHON

71       This  page  is  part of release 5.10 of the Linux man-pages project.  A
72       description of the project, information about reporting bugs,  and  the
73       latest     version     of     this    page,    can    be    found    at
74       https://www.kernel.org/doc/man-pages/.
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78GNU                               2020-12-21                           PUTS(3)
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