Write a function called diff(list) that returns the difference between the largest and smallest values in the list. For example,

diff([10, 3, 5, 6]) ? 7 diff([7, 2, 10, 9]) ? 8 diff([2, 10, 7, 1]) ? 9

Hint: to get the largest ( or smallest) number, you can compare the first number, list[0], with all the other numbers one by one, and assign the value of other number to it if the other number is larger (or smaller).