#include<assert.h>

#pragma CIVL ACSL

$input int N;
$assume(N > 0);

void arrayZeroes(int *a, int n) {
  int i;
  
  /*@ loop invariant 0 <= i && i <=n;
    @ loop invariant \forall int j; 0<=j && j<i ==>
    @                               a[j] == 0;
    @*/
  for (i = 0; i < n; i++) 
    a[i] = 0;
}

int main() {
  int a[N];

  $havoc(&a);
  arrayZeroes(a, N);
  $assert($forall (int i : 0 .. N-1) a[i] == 0);
}