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用面向對象語言實現一個計算器控制臺程序

#include <iostream>
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using namespace std;
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//Operation 運算類
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class Operation{
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double m_numberA;
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double m_numberB;
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public:
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void SetNumA(double numA) { m_numberA = numA;}
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void SetNumB(double numB) { m_numberB = numB;}
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double GetNumA(void) const { return m_numberA;}
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double GetNumB(void) const { return m_numberB;}
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virtual double GetResult() = 0;
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};
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class OperationAdd:public Operation{
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public:
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double GetResult(){
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return GetNumA() + GetNumB();
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}
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};
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class OperationSub:public Operation{
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public:
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double GetResult(){
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return GetNumA() - GetNumB();
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}
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};
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class OperationMul:public Operation{
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public:
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double GetResult(){
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return GetNumA() * GetNumB();
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}
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};
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class OperationDiv:public Operation{
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public:
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double GetResult(){
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if (GetNumB() == 0)
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throw "numB cannot be zero!";
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return GetNumA() / GetNumB();
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}
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};
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class OperationFactory{
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public:
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static Operation* CreateOperate(char oper){
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Operation *poper = NULL;
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switch (oper){
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case '+':
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poper = new OperationAdd;
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break;
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case '-':
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poper = new OperationSub;
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break;
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case '*':
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poper = new OperationMul;
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break;
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case '/':
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poper = new OperationDiv;
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break;
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}
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return poper;
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}
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};
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int main()
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{
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cout<<"input A:";
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double numA;
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cin>>numA;
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cout<<"input operator:";
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char oper;
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cin>>oper;
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cout<<"input B:";
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double numB;
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cin>>numB;
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Operation *poper = OperationFactory::CreateOperate(oper);
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poper->SetNumA(numA);
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poper->SetNumB(numB);
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cout<<poper->GetNumA()<<' '<<oper<<' '<<poper->GetNumB()<<" = "<<poper->GetResult()<<endl;
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system("pause");
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return 0;
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}

posted on 2011-08-12 14:18 Hsssssss 閱讀(646) 評論(1) 編輯收藏引用所屬分類: C++代碼

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# re: 用面向對象語言實現一個計算器控制臺程序 2011-08-12 22:16 Hsssssss

用面向對象語言實現一個計算器控制臺程序

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