ex21.py

# "Functions Can Return Something"
# return sets variables to be a value from a function

def add(a, b):
    print "ADDING %d + %d" % (a, b)
    return a + b

def subtract(a, b):
    print "SUBTRACTING %d - %d" % (a, b)
    return a - b

def multiply(a, b):
    print "MULTIPLYING %d * %d" % (a, b)
    return a * b

def divide(a, b):
    print "DIVIDING %d / %d" % (a, b)
    return a / b

print "Let's do some math with just functions!"

age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)

print "Age: %d, Height: %d, Weight: %d, IQ: %d" % (
    age, height, weight, iq)

# A puzzle for extra credit, type it anyway. 
print "Here's a puzzle."

# what = 35+(74-(180*(50/2)))
# what = (30+5)+((78-4)-((90*2)*((100/2)/2)))
what = add(age, subtract(height, multiply(weight, divide(iq, 2))))

print "That becomes:", what, "Can you do it by hand?"
print "Yes, I can: %d" % ((30+5)+((78-4)-((90*2)*((100/2)/2))))