function address 3

def a(x, y):

print("I am from function a")

return x(y)

def b(z):

z()

def c(): #register the address of function c with the content below. Function c is not run until function c is called outside on line 9.

print("I am from function c")

print("I am from function b")

return c #return must be placed at the end of the function

def d():

print("I am from function d")

a(b,d)()