初始代码.cpp

设计模式：工厂模式、单例模式的基本实现

#include <iostream>
using namespace std;

int main()
{
	int a;
	cout << "请输入数字a :";
	cin >> a;

	int b;
	cout << "请输入数字b :";
	cin >> b;

	char c;
	cout << "请输入操作符c :";
	cin >> c;

	int d;
	if(c == '+')
		d = a+b;
	if(c == '-')
		d = a-b;
	if(c == '*')
		d = a*b;
	if(c == '/')
		d = a/b;

	cout << "结果是: " << d << endl;

	return 0;
}