You are to write a program that adds two two-digit integers. Can you test this program exhaustively? If so, how many test cases are required? Assuming that each test case can be executed and analyzed...

You are to write a program that adds two two-digit integers. Can you test this program exhaustively? If so, how many test cases are required? Assuming that each test case can be executed and analyzed in one second, how long would it take for you to run all the tests?