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;
 }

 }
 
}