1  extern int gArray[];
       2  
       3  int foo(int *a)
       4  {
       5    int *p = a;
       6  
       7    return *p;
       8  }
       9  
      10  int main(int argc, char *argv[])
      11  {
      12    if (argc & 1)
      13      gArray[argc - 1] = 1;
      14  
      15    if (argc > 1)
      16      return foo(gArray);
      17  
      18    return 0;
      19  }