Write a program that allows a user to display a horizontal “bar-graph”.
Your program first asks the user to enter a series of positive integers (no more than 20).
They can indicate they are done by entering -1. You should read these numbers into an
array. Be sure you do not allow the user to enter negative numbers. Also make sure the
number entered is less than 70.
Once you have read all the numbers from the user, you are to print a horizontal bar graph,
with each line corresponding to one of the numbers entered. Use iomanip and functions