# Author:  James Tam
# Version: Oct 2016

def isZero(num):
    if (num == 0):
        return(True)
    else:
        return(False)
                                                                               
def divide(numerator,denominator):
    result = -1
    # Students write this part of the function
    if (isZero(denominator) == False):
        result = numerator / denominator
    else:
        result = -1
    return(result)

def start():
    num = divide(2,3)
    print(num)
    num = divide(2,0)
    print(num)

start()