表达式

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创建一个控制台应用程序

using System;
using System.Collections.Generic;
using System.Text;

namespace Ch03Ex02
{
    class Program
    {
        static void Main(string[] args)
        {
            double firstNumber, secondNumber;
            string userName;
            Console.WriteLine("Enter your name");
            userName =Console.ReadLine();
            Console.WriteLine("Welcome{0}!",userName);
            Console.WriteLine("Now give me a number");
            firstNumber=Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("Now give me another number:");
            secondNumber=Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("The sum of{0} and {1} is {2}.",firstNumber ,
                secondNumber,firstNumber+secondNumber);
            Console.WriteLine("The result of subtracting {0} from {1} is {2}.",
                secondNumber ,firstNumber,firstNumber - secondNumber);
            Console.WriteLine("The product of {0} and {1} is {2}.",
                firstNumber,secondNumber, firstNumber * secondNumber);
            Console.WriteLine("The result of dividing {0} by {1} is {2},",
                firstNumber, secondNumber, firstNumber / secondNumber);
            Console.WriteLine("The remainder after dividing {0} by {1} is {2}.",
                firstNumber, secondNumber, firstNumber % secondNumber);
            Console.ReadKey();
        }
    }
}