/*
PROOF OF CORRECTNESS:
  COMP(x,y):  computation unknown
  That is, what does the function really compute? Note that you must also fill-in the 
  POST condition.
*/
#include <stdio.h>

int comp(int x, int y) {
int z, w;

  // PRE: y >= 0
  
  z = x;




  w = y;

 

 
  // INVARIANT:
  

  while ( w > 0 ) {




    z = z + y;
    




    w = w - 1;



  }
  

  // INVARIANT:                                   and EXIT:        
  




   
  // POST: z = 
  
  return z;
}

int main() {
printf("comp(2,3)=%d\n",comp(2,3)); }