Design Pattern Learning July 6

One: Simple Factory mode

Python:

Class Operation:

def getresult (self):

Pass

Class Opertationadd (operation):

def getresult (SELF,O1,O2):

Return o1+02

Class Operationdiv (operation):

def getresult (SELF,O1,O2):

Tyr

Return O1/o2

Except

Print: "Error.divided by Zero"

return 0

Class Operationundef (operation):

def getresult (self):

Print "Undefine operation."

return 0

Class Operationfactory:

Operations = {}

operations[' + '] = Operationadd ()

operations['/'] = Operationdiv ()

def createoperation (self,ch):

If ch in self.operation:

OP = self.operation[ch]

Else

op = operationundef ()

Return op

C++:

Design Pattern Learning July 6