#include <stdio.h>
#include <stdlib.h>

// note that, in contrast to example4.cpp, here
// the arguments of the foo function are pointers.
void foo(int * a, int * b)
{
  *a = 10;
  *b = 20;
}


int main()
{
  int x = 333;
  int y = 444;

  printf("before calling foo:\n");
  printf("x = %d, y = %d\n\n", x, y);
  foo(&x, &y);

  // note that, in contrast to example4.cpp, the values of x and y 
  // are different after calling the foo function.
  printf("after calling foo:\n");
  printf("x = %d, y = %d\n", x, y);
}