Question

c#如何使用控制台程序编写一个简单的四则运算计算器？

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("第一个数：");
int a = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("输入运算符（+—*/）");
// c=Console.ReadLine();
char str=Convert.ToChar(Console.ReadLine());

Console.WriteLine("第er个数：");
int b = Int32.Parse(Console.ReadLine());

//int c = a + b;
//Console.WriteLine("两个数和为：{0}",c);

switch (str) {
case '+':
Console.WriteLine("两个数和为：{0}", a+b);

break;
case '-':
Console.WriteLine("两个数差为：{0}", a-b);
break;
case '*':
Console.WriteLine("两个数积为：{0}", a*b);
break;
case '/':
Console.WriteLine("两个数商为：{0}", a/b);
break;
case '%':
Console.WriteLine("两个数余数为：{0}", a % b);
break;
default:
Console.WriteLine("输入正确的运算符！！");
break;

}

}
}
}