#include <stdio.h>

/* Input: We pass the values of two variables to f.
   We change the values of the formal parameters in f. */
 
void f(int fp1, int fp2){
  fp1 += 1; fp2 += 2;                       /* Bad to alter the values of formal parameters */
  printf("fp1 + fp2 = %d + %d = %d\n", fp1, fp2, fp1 + fp2);
}

int main(void) {
  int i = 3,
      j = 4;
  
  f(i, j);

  printf("i + j = %d + %d = %d\n", i, j, i + j);
  
  return 0;
}