【简单计算器】实现加减乘除

//2012年12月1日16:59:52，有图#include "stdafx.h"#include <iostream>using namespace std;int main(){float num1, num2;char ch;cout << "please input tow numbers expression:";cin >> num1 >> ch >> num2;switch (ch){case '+':cout << num1 << "+" << num2 << "=" << num1+num2 << endl;break;case '-':cout << num1 << "-" << num2 << "=" << num1-num2 << endl;break;case '*':cout << num1 << "x" << num2 << "=" << num1*num2 << endl;break;case '/':if (num2)    cout << num1 << "/" << num2 << "=" << num1/num2 << endl;else cout << "error!\n";break;default:cout << "input error!\n";break;}return 0;}