设计模式复习-简单工厂模式
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设计模式复习-简单工厂模式
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简单工厂模式
实现整数四则运算 (1) 基本实现 (2) 健壮实现 (3) 工厂模式
#pragma once
#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;//(1)基本实现
void BasicFun() {int nNumberFirst, nNumberSecond;char cSymbol;cin >> nNumberFirst;cin >> nNumberSecond;cin >> cSymbol;if (cSymbol == '+') cout << nNumberFirst + nNumberSecond;if (cSymbol == '-') cout << nNumberFirst - nNumberSecond;if (cSymbol == '*')cout << nNumberFirst * nNumberSecond;if (cSymbol == '/')cout << nNumberFirst / nNumberSecond;getchar();return ;
}
//(2)规范和健壮性实现
void StandardAndRobustFun() {int nNumberFirst, nNumberSecond;string strSymbol="";try {cin >> nNumberFirst;cin >> nNumberSecond;cin >> strSymbol;if (nNumberSecond == 0 && strSymbol[0] == '/') {cout << "error:The dividend cannot be zero ";return;}switch (strSymbol[0]) {case '+': cout << nNumberFirst + nNumberSecond << endl; break;case '-': cout << nNumberFirst - nNumberSecond << endl; break;case '*': cout << nNumberFirst * nNumberSecond << endl; break;case '/': cout << nNumberFirst / nNumberSecond << endl; break;default:cout << "Input Format Error" << endl; break;}}catch (void *pErrorKey) {cout << "Unknow Error" << endl;}return;
}
//(3)简单工厂模式
class COperationClass {
public:virtual bool GetValue(const int &nNumberFirst, const int &nNumberSecond, int &nNumberAns) = 0;
};
class CAddition :public COperationClass {
public:bool GetValue(const int &nNumberFirst, const int &nNumberSecond, int &nNumberAns) {nNumberAns = nNumberFirst + nNumberSecond;return true;}
};
class Csubtraction :public COperationClass {
public:bool GetValue(const int &nNumberFirst, const int &nNumberSecond, int &nNumberAns) {nNumberAns = nNumberFirst - nNumberSecond;return true;}
};
class Cmultiplication :public COperationClass {
public:bool GetValue(const int &nNumberFirst, const int &nNumberSecond, int &nNumberAns) {nNumberAns = nNumberFirst * nNumberSecond;return true;}
};class Cdivision :public COperationClass {
public:bool GetValue(const int &nNumberFirst, const int &nNumberSecond, int &nNumberAns) {if (nNumberSecond == 0) {return 0;}nNumberAns = nNumberFirst / nNumberSecond;return true;}
};class CFactory {
public:bool GetAlgorithm(const string &strSymbol, COperationClass * &pAlgorithm) {pAlgorithm = NULL;switch (strSymbol[0]) {case '+': pAlgorithm = new CAddition(); break;case '-': pAlgorithm = new Csubtraction(); break;case '*': pAlgorithm = new Cmultiplication(); break;case '/': pAlgorithm = new Cdivision(); break;default: return false;}return pAlgorithm != NULL;}
};int main()
{system("color 0b");//BasicFun();//StandardAndRobustFun();CFactory CFactorTest;COperationClass * pOperationNow = NULL;if (CFactorTest.GetAlgorithm("+", pOperationNow)) {int nComputerResult = 0;pOperationNow->GetValue(1, 2, nComputerResult);cout << nComputerResult << endl;delete(pOperationNow);}else {cout << "error" << endl;}getchar();return 0;
}
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