one for city). Project Drill 2 (25 points) Create a C program which uses a "while loop" to obtain three numbers from the user, print the numbers entered, and print the average of all three numbers. Project Drill 3 (25 points) Create a C program which sets up an array with four elements to store grades. Use a for loop to print out the grades. Project Drill 4 (25 points) Create a C program, which defines, and assigns values to, two integers in the main program. Pass the addresses of these two integers to a function. The function should calculate the value of the sum of the two numbers, and return the value back to the main program. The program must print the values of the two numbers used, and the calculated sum of both the numbers