Chapter 5, Problem 8PP

Complete the previous Programming Project and create a top-level function named dayOfWeek with the header:

  int dayOfWeek(int month, int day, int year);

The function should encapsulate the necessary logic to return the day of the week of the specified date as an int (Sunday = 0, Monday = 1, etc.) You should add validation code to the function that tests if any of the inputs are invalid. If so, the function should return –1 as the day of the week. In your main function write a test driver that checks if dayOfWeek is returning the correct values. Your set of test cases should include at least two cases with invalid inputs.