C++ please

1. Write a do while loop that continually loops until the user enters a single digit between 0 and 9. There should only be one prompt for the user to enter a number inside the loop.

2. Write a simple 4 function calculator using a switch statement. The program should switch on the operator: +, -, *, /. The user should enter two numbers (any type is fine) and then enter an operator and the program should perform the calculation indicated.

3. Write a program that has the user enter a numeric scores (0-100) and then, using the conditional operator, display whether or not the student made a passing score. A passing score is 70 or above.