function testing

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!\n')

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\n' % (age,height,weight,iq))
print('~' * 80)
#a puzzle for extra credit
print('Here is a puzzle\n')


what = add(age,subtract(height,multiply(weight,divide(iq,2))))

print('That becomes: ', what, 'Can you do it by hand?')
x = iq
w = weight
s = height
f = age
print(s-x/2*w+f)
print((s-((x/2)*w))+f)
print(-(((int(x) / 2) * int(w)) - int(s)) + int(f) )
#print('(((iq/2)*weight)-height)+add')