When we are using while loop to compute the product of several values we need to initialize the value holding the product to 1 because when we multiply something with 1 it will give the same number.
If we initialize it with 0 the product will come out to be 0 because anything multiplied by 0 is 0.
we cannot initialize it with NULL because it is not a pointer.
We need to initialize the number since it contains garbage values so it will give product with that value.
