C#封装四则运算示例

using System;

public class Operation
{
    public static double GetResult(double numberA, double numberB, string operate)
    {
        double result = 0d;
        switch (operate)
        {
            case "+":
                result = numberA + numberB;
                break;
            case "-":
                result = numberA - numberB;
                break;
            case "*":
                result = numberA * numberB;
                break;
            case "/":
                result = numberA / numberB;
                break;
        }
        return result;
    }


    class Program
    {
        public static void Main(string[] args)
        {
            Console.Write("Please input numberA: ");
            string strNumberA = Console.ReadLine();
            Console.Write("Please select operate(+ - * /): ");
            string strOperate = Console.ReadLine();
            Console.Write("Please input numberB: ");
            string strNumberB = Console.ReadLine();
            string strResult = "";
            strResult = Convert.ToString(Operation.GetResult(Convert.ToDouble(strNumberA),Convert.ToDouble(strNumberB), strOperate));
            Console.WriteLine("Result is :" + strResult);
            Console.ReadLine();
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}