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

int a = 0;

void f(int n) { 
  int i=0;  i = i + 1;  n = n + 1;  a = a + 1;
}

int main(void) {
  int i = 0, n = 0;
  printf("Checkpoint A:  i = %d, n = %d and a = %d\n",  i, n, a); 
  f(n);
  printf("Checkpoint B:  i = %d, n = %d and a = %d\n",  i, n, a); 
  return EXIT_SUCCESS;
}