In your code, n is always 0 since you have modifed it. You should store a temporary variable for n beforehand.

I assume it means that somewhere in your code you divide by a variable that has 0 as value.

@Coopsec - consider: volume of sphere (dough blob) == volume of cylinder (pizza of different thicknesses)

The "crispy" crust pizzas are 1 unit deep

The "thick" crust pizzas are 5 units deep

I'd start with reading the description :)