面向对象 的特性 继承 简单计算器

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入第一个数");
            double numb1 = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("请输入第二个数");
            double numb2 = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("请输入要进行的运算");
            string oprationstr = Console.ReadLine();
            double result = 0;
            #region MyRegion
            /*switch (oprationstr)
            {
                case "+":
                    result = numb1 + numb2;
                    break;
                case "-":
                    result = numb1 - numb2;
                    break;
                case "*":
                    result = numb1 * numb2;
                    break;
                case "/":
                    result = numb1 / numb2;
                    break;
            }*/
            #endregion
           

            //使用类
            OprationLibrary.Opration op = new OprationLibrary.Opration();
            result = op.GetResult(numb1, numb2, oprationstr);

            /*OprationLibrary.OprationSqrt sqrt = new OprationLibrary.OprationSqrt();
            result= sqrt.Sqrt(numb1, numb2, oprationstr);*/

            OprationLibrary.OprationSin sin = new OprationLibrary.OprationSin();
            result= sin.Sin(numb1, numb2, oprationstr);
            Console.WriteLine(result);
            Console.ReadKey();
        }
    }

}

 

 

OprationLibrary类库

Opration.cs

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

namespace OprationLibrary
{
    public class Opration
    {
        public double GetResult(double numb1, double numb2, string oprationstr)
        {
            double result = 0;
            switch (oprationstr)
            {
                case "+":
                    result = numb1 + numb2;
                    break;
                case "-":
                    result = numb1 - numb2;
                    break;
                case "*":
                    result = numb1 * numb2;
                    break;
                case "/":
                    result = numb1 / numb2;
                    break;
            }
            return result;
        }
    }
}

 

 

 

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

namespace OprationLibrary
{
    public class OprationSin:OprationSqrt
    {
        public double Sin(double numb1, double numb2, string oprationstr)
        {
            if (oprationstr == "sin")
            {
                return Math.Sin(numb1);
            }
            else
            {
                OprationSqrt op = new OprationSqrt();
                return op.GetResult(numb1, numb2, oprationstr);
            }
        }
    }
}

 

 

 

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

namespace OprationLibrary
{
    public class OprationSqrt:Opration
    {
        public double Sqrt(double numb1, double numb2, string oprationstr)
        {
            if (oprationstr == "sqrt")
            {
                return Math.Sqrt(numb1);
            }
            else
            {
                return GetResult(numb1, numb2, oprationstr);
            }           
        }
    }
}

 

 

WindowsFormsApplication1:

 

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double numb1 = Convert.ToDouble(this.textBox1.Text);
            double numb2 = Convert.ToDouble(this.textBox3.Text);
            string oprationstr = this.textBox2.Text;
            double result = 0;
            #region MyRegion
            /*switch (oprationstr)
            {
                case "+":
                    result = numb1 + numb2;
                    break;
                case "-":
                    result = numb1 - numb2;
                    break;
                case "*":
                    result = numb1 * numb2;
                    break;
                case "/":
                    result = numb1 / numb2;
                    break;
            }*/
            #endregion

            OprationLibrary.Opration op = new OprationLibrary.Opration();
            result= op.GetResult(numb1, numb2, oprationstr);
            MessageBox.Show(result.ToString());
        }
    }
}