#include <stdio.h>
int fputs(const char *s, FILE *str);
int puts(const char *s);

#include <wchar.h>
int fputws(const wchar_t *s, FILE *str);

fputs, puts and fputws write a null-terminated string s to a stream, excluding the null character. fputs and puts write to a byte-oriented stream, and fputws writes to a wide-oriented stream. fputs and fputws write to str, while puts writes to stdout, and appends a newline character.

The functions return EOF if a write error occurs. fputws also fails if there's an encoding error. Otherwise, the functions return a non-negative value.