i = 10
j = 20
while(i < j):
    print(i, j)
    j -= 3
    i -= 1

# Question:  What does this print?

# Here's a function puzzle

def foo(a, b):
    a = 100
    c = 400
    return b / 2

a = 10
b = 5
b = foo(a,b)
print(a, b)

print(c)  # This prints an error.  What error does it print, and why does this generate an error?

# What does this print?