1) Write a program in C++ that take three scores from user and calculate the average using do-while loop. It repeats as many times as the user wishes. The program only terminates when a user press N...

1) Write a program in C++ that take three scores from user and calculate the average using do-while loop. It repeats as many times as the user wishes. The program only terminates when a user press N and Y to continue again any other character should display invalid character.