Question

Hi, I have an array : int [] num = new int[6]{1,2,2,1,1,2};

I want to multiply the value at element 0 with every other value, I then want to multiply the value at element 1 with the values at elements 2 through to the last element. Then multiply the value at element 2 with the values from 3 through to the end, and so on until I have iterated through the whole array.

My efforts thus far seem clumsy and verbose, so I was wondering if anyone could show me an elegant way of achieving my aim.

Many thanks.

Answer 1

You can go through the array backwards and do it in one pass and not repeat operations.

 for (int i = num.Length - 2; i >= 0; i--)
 {
     num[i] *= num[i + 1];
 }

Gives 8,8,4,2,2,2