用C++实现的命令行计算器

C++实现的命令行计算器。
只进行加减乘除运算，没有进行异常判断。没啥技术含量，直接贴代码。

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
void main() {

cout << " ********************************************************" << endl;
cout << " 命令行计算器" << endl << endl;
cout << " 1.用法介绍：第一次先输入一个数字，然后回车" << endl;
cout << " 2.输入运算符号，然后回车" << endl;
cout << " 3.再次输入一个数字，然后回车，程序会自动运算出结果" << endl;
cout << " 4.输入exit退出程序" << endl;
cout << " ********************************************************" << endl;
string leftParStr;
int leftParInt;
int rightParInt;
string rightParStr;
string calculator;
while(true) {

cout << "1.请输入运算左值：";
cin >> leftParStr;
if(leftParStr == "exit")
return;
cout << "2.请输入运算符：";
cin >> calculator;
if(calculator == "exit")
return;
cout << "3.请输入运算右值：";
cin >> rightParStr;
if(rightParStr == "exit")
return;
leftParInt = atoi(leftParStr.c_str());
rightParInt = atoi(rightParStr.c_str());
if(calculator == "+") {
cout << " The result of this calculator is: " << leftParInt + rightParInt << endl;
}
///*
if(calculator == "-") {
cout << " The result of this calculator is: " << leftParInt - rightParInt << endl;
}
if(calculator == "*") {
cout << " The result of this calculator is: " << leftParInt * rightParInt << endl;
}
if(calculator == "/") {
cout << " The result of this calculator is: " << leftParInt / rightParInt << endl;
}
}

}本文出自 “怒放的生命” 博客，请务必保留此出处http://shane.blog.51cto.com/824878/339922