# threeVersionsIsEven.py   P. Conrad for CS5nm, 11/10/08
#   Three different ways to write isEven.
#   All of these will produce the same results


# The shortest version

def isEven(n):
    return (n%2==0)

# This version is just longer

def isEven_v2(n):
    if (n%2==0):
        return True
    else:
        return False

# This version uses the fact that
#  once you return a value, the function call is over.
# So the only way that the function reaches the line "return False"
#  is when we didn't return True, so the "else" is actual unnecessar

def isEven_v3(n):
    if (n%2==0):
        return True
    return False

# A way to quickly write isOdd, given that we already have isEven

def isOdd(n):
    return not isEven(n)