DCT1083 Programming Fundamentals Lab 26 sept 2013

Write function headers for the following functions:

1. Computing a sales commission, given the sales amount and the commission rate.
2. Printing the calendar for a month, given the month and year.
3. Computing a square root.
4. Testing whether a number is even, and returning true if it is.
5. Printing a message a specified number of times.
6. Computing the monthly payment, given the loan amount, number of years, and annual interest rate.