# Function_passing.py
# This program demonstrates how to pass a function as an argument!
# This works the same as when you store the command in a Button
# as the callback.

currentFunction = None

def addFunc(x, y):
    print "ADD ", x+y

def subtractFunc(x, y):
    print "SUBTRACT ", x-y

def multiplyFunc(x, y):
    print "MULTIPLY ", x*y


def storeFunction(theFunc):
    global currentFunction
    currentFunction = theFunc
    

def callCurrent(x, y):
    currentFunction(x, y)


def main():

    # Call the store function with a function as
    # the parameter!
    #storeFunction(multiplyFunc)
    #storeFunction(addFunc)
    storeFunction(subtractFunc)

    # Now, let callCurrent dynamically call the
    # stored function!
    callCurrent(4, 5)

main()