#include <stdio.h>

int main(void) {

  FILE *output_file_pointer;
  char *str = "Another string";
  int i;

  output_file_pointer = fopen("first-file", "a");

  while (*str != '\0'){
    fputc(*str, output_file_pointer);
    str++;
  }

  fclose(output_file_pointer);
  return 0;
}