# Author:  James Tam
# Version: May 19, 2021
# Learning objective: writing test drivers (test cases) to verify the correctness
# (test) of a function.


def absolute(number):
    if (number < 0):
        result = number * -1
    else:
        result = number
    return(result)

# Test cases
print(absolute(-13))
print(absolute(7))