std::fputs (3) - Linux Manuals
Defined in header <cstdio>
int fputs( const char* str, std::FILE* stream );
Writes every character from the null-terminated string str to the output stream stream, as if by repeatedly executing std::fputc.
The terminating null character from str is not written.
str - null-terminated character string to be written
stream - output stream
On success, returns a non-negative value
On failure, returns EOF and sets the error indicator (see std::ferror) on stream.
The related function std::puts appends a newline character to the output, while std::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.
// Run this code
snprintf prints formatted output to stdout, a file stream or a buffer