< cpp‎ | io‎ | c
Input/output library
I/O manipulators
C-style I/O
(deprecated in C++98)
File I/O
String I/O
Array I/O
(deprecated in C++98)
(deprecated in C++98)
(deprecated in C++98)
Synchronized Output
Error category interface
Defined in header <cstdio>
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 std::fputc.

The terminating null character from str is not written.


str - character string to be written

Return value

On success, returns a non-negative value

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


The std::puts function appends the newline character to the output, while std::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 std::puts is running out of space on the file system, when stdout is redirected to a file.


#include <cstdio>
int main()
    int rc = std::puts("Hello World");
    if (rc == EOF)
       std::perror("puts()"); // POSIX requires that errno is set


Hello World

See also

writes a character string to a file stream
prints formatted output to stdout, a file stream or a buffer