sample.c

void check(char *password)

{
  size_t password_length;
  char character_test;
  uint char_counter;
  int accumulator;
  int number_from_char;
  
  accumulator = 0;
  char_counter = 0;
  while( true ) {
    password_length = strlen(password);
    if (password_length <= char_counter) {
      printf("Password Incorrect!\n");
      return;
    }
    character_test = password[char_counter];
    sscanf(&character_test,"%d",&number_from_char);
    accumulator = accumulator + number_from_char;
    if (accumulator == 0xf) break;
    char_counter = char_counter + 1;
  }
  printf("Password OK!\n");
                    /* WARNING: Subroutine does not return */
  exit(0);
}