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Consider the following iterative program that is supposed to compute the product of m and n using addition (no multiplications are allowed!)

  public int mpy(int m, int n) { // m and n must be nonnegative
     int i = 0;                      /* line 1 */
     int ans = ?  ;                  /* line 2 */
     while (i != n) {                /* line 3 */
        i = i + 1;
        ans =  ????  ;               /* line 4 */
     }
     return ans;
  }