1  foo1 (p)
       2       char *p;
       3  {
       4    p[0] = p[1];
       5    return p[0];
       6  }
       7  
       8  foo2 (p, x)
       9       char *p;
      10  {
      11    p[0] = x;
      12    return p[0];
      13  }
      14