简易计算器案例

简易计算器案例

 

 

计算类封装

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

namespace MyCalculator.Optimization
{
    /// <summary>
    /// 计算器封装
    /// </summary>
    public class Calculator
    {
        //当前的操作符
        public string Operation { get; set; }

        /// <summary>
        /// 封装逻辑算法
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public int StartCalculator(string data)
        {
            //获取操作数
            string num1 = data.Substring(0, data.IndexOf(Operation));
            string num2 = data.Substring(data.IndexOf(Operation) + 1);
            //类型转换
            int a = Convert.ToInt32(num1);
            int b = Convert.ToInt32(num2);

            //按照类型运算
            int result = 0;
            switch (Operation)
            {
                case "+":
                    result = Add(a,b);
                    break;
                case "-":
                    result = Sub(a, b);
                    break;
                case "×":
                    result = Mul(a, b);                
                    break;
                case "÷":
                    result = Div(a, b);
                    break;
            }
            return result;
        }

        //内部私有方法【封装】
        private  int Add(int a, int b)
        {
            return a + b;
        }
        private int Sub(int a, int b)
        {
            return a - b;
        }
        private int Div(int a, int b)
        {
            return a / b;
        }
        private int Mul(int a, int b)
        {
            return a * b;
        }
    }
}

 

主窗体程序

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

namespace MyCalculator.Optimization
{
    public partial class FrmMain : Form
    {
        private Calculator myCalculator = new Calculator();

        public FrmMain()
        {
            InitializeComponent();
            InitBtn();
        }

        #region 数字键关联事件


        public void InitBtn()
        {
            this.btn0.Click += new EventHandler(btn_Click);
            this.btn1.Click += new EventHandler(btn_Click);
            this.btn2.Click += new EventHandler(btn_Click);
            this.btn3.Click += new EventHandler(btn_Click);
            this.btn4.Click += new EventHandler(btn_Click);
            this.btn5.Click += new EventHandler(btn_Click);
            this.btn6.Click += new EventHandler(btn_Click);
            this.btn7.Click += new EventHandler(btn_Click);
            this.btn8.Click += new EventHandler(btn_Click);
            this.btn9.Click += new EventHandler(btn_Click);

            this.btn_Multiply.Click += new System.EventHandler(this.btn_Cal_Click);
            this.btn_Add.Click += new System.EventHandler(this.btn_Cal_Click);
            this.btn_div.Click += new System.EventHandler(this.btn_Cal_Click);
            this.btn_Sub.Click += new System.EventHandler(this.btn_Cal_Click);
        }


        #endregion

        //在屏幕上显示数字
        private void btn_Click(object sender, EventArgs e)
        {         
            this.lblResult.Text += ((Button)sender).Tag.ToString();
        }
        //保存操作符
        private void btn_Cal_Click(object sender, EventArgs e)
        {          
            myCalculator.Operation = ((Button)sender).Tag.ToString();
            this.lblResult.Text += myCalculator.Operation;
        }
        //开始运算
        private void btnCalculate_Click(object sender, EventArgs e)
        {
            int result = myCalculator.StartCalculator(this.lblResult.Text);
            this.lblResult.Text += "=" + result;
        }
        //清除
        private void btn_Clear_Click(object sender, EventArgs e)
        {
            this.lblResult.Text = "";
        }
    }
}