Question

Trace and document every step of execution of the following program:

public class Trace {

   public static void main(String[] args) {
       int[] num = {1, 3, 6, 9, 12 };

       for (int i = 4; i >= 0; i--) {
           num[i] +=1;
       }
           num[0] *=num[4];
       }
   }

Answer 1

well simply first understand that in the for loop simply all the number are

being incremented by 1 starting from the last index to first .

Now the new num array is num = {2,4,7,10,13 }

then at the end 1st element is changed by its multiplication with the last element

and hence num[0] =2*13=26;

hence final array num ={26,4,7,10,13}

Also you can see this window as confirmation

if u have any query feel free to ask and please like my answer