#include <stdio.h>
int puts(const char *s);
puts writes the string pointed to by s to the standard output stream using putchar and appends a new-line character to the output. The terminating null character is not written.
puts returns EOF if a write error occurs; otherwise it returns a nonnegative value.
puts conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).