Defined in header <stdio.h>
int fputs( const char          *str, FILE          *stream );
(until C99)
int fputs( const char *restrict str, FILE *restrict stream );
(since C99)

Writes every character from the null-terminated string str to the output stream stream, as if by repeatedly executing fputc.

The terminating null character from str is not written.


str - null-terminated character string to be written
stream - output stream

Return value

On success, returns a non-negative value.

On failure, returns EOF and sets the error indicator (see ferror()) on stream.


The related function puts appends a newline character to the output, while fputs writes the string unmodified.

Different implementations return different non-negative numbers: some return the last character written, some return the number of characters written (or INT_MAX if the string was longer than that), some simply return a non-negative constant such as zero.


#include <stdio.h>
int main(void)
    int rc = fputs("Hello World", stdout);
    if (rc == EOF)
       perror("fputs()"); // POSIX requires that errno is set


Hello World


  • C11 standard (ISO/IEC 9899:2011):
    • The fputs function (p: 331-332)
  • C99 standard (ISO/IEC 9899:1999):
    • The fputs function (p: 297)
  • C89/C90 standard (ISO/IEC 9899:1990):
    • The fputs function

See also

prints formatted output to stdout, a file stream or a buffer
writes a character string to stdout
gets a character string from a file stream
C++ documentation for fputs

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