简单工厂模式

#pragma onceclass Operation{public:Operation(void);~Operation(void);public:double m_numberA;double m_numberB;public: virtualdouble GetResult()=0;};struct OperateFactory { static Operation* CreateOperate(char operate);};

 

 

#include "Operation.h"#include <string>#include <exception>using namespace std;Operation::Operation(void){this->m_numberA=0;this->m_numberB=0;}Operation::~Operation(void){}//加法class OperationAdd:public Operation{public:double GetResult(){double m_result=0;m_result=this->m_numberA+this->m_numberB;return m_result;}};//减法class OperationSub:public Operation{public:double GetResult(){double m_result=0;m_result=this->m_numberA-this->m_numberB;return m_result;}};//乘法class OperationMul:public Operation{public:double GetResult(){double m_result=0;m_result=this->m_numberA*this->m_numberB;return m_result;}};//除法class OperationDiv:public Operation{public:double GetResult(){double m_result=0; if (this->m_numberB==0){throw new exception("除数不能为0");return 0;}else{m_result=this->m_numberA/this->m_numberB;return m_result;}}};Operation* OperateFactory::CreateOperate( char operate ){Operation *oper;switch (operate){case '+':oper=new OperationAdd;break;case '-':oper=new OperationSub;break;case '*':oper=new OperationMul;break;case '/':oper=new OperationDiv;break;}return oper;}

 

// Factory.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <iostream>#include <string>#include "Operation.h"using namespace std;int _tmain(int argc, _TCHAR* argv[]){//OperateFactory Ofactory;Operation *oper;oper=OperateFactory::CreateOperate('+');oper->m_numberA=1121;oper->m_numberB=1111;double Result=oper->GetResult();cout<<Result;delete oper;getchar();return 0;}