Write a program that asks a user for two points that are whole numbers as input (assume the user inputs the correct data, in other words, you do not have to validate this input). Store the first point in the variables X1 and Y1. Store the second point in X2 and Y2. Create two user-defined functions. One function should return the midpoint of the line. The second function should return the slope of the line. Display the returned values to the monitor appropriately labeled midpoint and slope..