std::puts (3) - Linux Man Pages
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
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.
// Run this code
snprintf prints formatted output to stdout, a file stream or a buffer