Write a method that returns the number of times that 'num' can be divided by 'div' before resulting in zero. For example, if you start with 'num'=50 and 'div'=4 the answer can be determined this way: 50/4=12 (because this is INTEGER division!) 12/4=3. 3/4=0. So there were 3 steps to get to zero, we therefore return 3. Preconditions: 'num' is non-negative. 'div' is greater than 1. Look at the test data for examples.