The process of finding the largest value is used frequently in computer applications. For example, a program that determines the winner of a sales contest would input the number of units sold by each salesperson. The salesperson who sells the most units wins the contest. Write a program using a while loop that lets the user enter a series of integers. The user should enter - 99 to signal the end of the series. After all the numbers have been entered, the program should display the largest of the numbers entered.