//Header file: #include <stdio.h> //Declaration: int fputs(const char *str, FILE *stream); //Return: returns nonnegative on success or EOF on failure. #include <stdio.h> #include <stdlib.h> int main(void) { FILE *fp; if((fp=fopen("test", "wb"))==NULL) { printf("Cannot open file.\n"); exit(1); } fputs("this is a test", fp); fclose(fp); }