Write a method called digitRange that accepts an integer as a parameter and returns the range of values of its digits. The range is defined as 1 more than the difference between the largest and smallest digit value. For example, the call of digitRange(68437) would return 6 because the largest digit value is 8 and the smallest is 3, so 8 − 3 + 1 = 6. If the number contains only one digit, return 1. You should solve this problem without using a String.