賀老師的教學(xué)鏈接??本課講解

示例：工廠模式

實現(xiàn)的C++代碼：

#include<iostream> using namespace std; //基類：運算類 class COperation { public:double numberA;double numberB;virtual double getResult() = 0; }; //加法 class AddOperation: public COperation { public:virtual double getResult(){return numberA+numberB;} }; //減法 class SubOperation: public COperation { public:virtual double getResult(){return numberA-numberB;} }; //乘法 class MultiOperation: public COperation { public:virtual double getResult(){return numberA*numberB;} }; //除法 class DivOperation: public COperation { public:virtual double getResult(){return numberA/numberB;} }; //工廠類 class CCalculatorFactory { public:static COperation* Create(char cOperator); };COperation* CCalculatorFactory::Create(char cOperator) {COperation *oper;switch (cOperator){case '+':oper=new AddOperation();break;case '-':oper=new SubOperation();break;case '*':oper=new MultiOperation();break;case '/':oper=new DivOperation();break;default:oper=new AddOperation();break;}return oper; }int main() {double a,b;char ch;cin>>a>>ch>>b;COperation * op=CCalculatorFactory::Create(ch);op->numberA=a;op->numberB=b;cout<<op->getResult()<<endl;return 0; }

總結(jié)

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