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puts

From cppreference.com
< c‎ | io
 
 
File input/output
Types and objects
Functions
File access
Direct input/output
Unformatted input/output
(C95)(C95)
(C95)
(C95)(C95)
(C95)
(C95)
Formatted input
(C99)(C99)(C99)(C11)(C11)(C11)     
 
Defined in header <stdio.h>
int puts( const char* str );

Writes every character from the null-terminated string str and one additional newline character '\n' to the output stream stdout, as if by repeatedly executing fputc.

The terminating null character from str is not written.

Contents

[edit] Parameters

str - character string to be written

[edit] Return value

On success, returns a non-negative value.

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

[edit] Notes

The puts function appends the newline character to the output, while fputs function does not.

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.

A typical cause of failure for puts is running out of space on the file system, when stdout is redirected to a file.

[edit] Example

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

Output:

Hello World

[edit] References

  • C23 standard (ISO/IEC 9899:2023):
  • 7.21.7.9 The puts function (p: TBD)
  • C17 standard (ISO/IEC 9899:2018):
  • 7.21.7.9 The puts function (p: TBD)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.21.7.9 The puts function (p: 333)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.19.7.10 The puts function (p: 299)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 7.9.7.10 The puts function

[edit] See also

writes a character string to a file stream
(function) [edit]
prints formatted output to stdout, a file stream or a buffer
(function) [edit]