1  void param_test(char my_char, char my_char_2);
       2  void sub0(void);
       3  void sub1(char *my_char);
       4  
       5  int main(int argc, char **argv)
       6  {
       7    char my_char = 'y';
       8    
       9    param_test('y', 'z');
      10    sub0();
      11    sub1(&my_char);
      12    
      13    return 0;
      14  }