C# 入门级计算器源码（实现了加减乘除等）

【实例简介】

之前做的一个小计算器，算法有点复杂QAQ

已知Bug：连续点击两次运算符号会导致结果出错。

【实例截图】

【核心代码】

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 _001Software_计算器
{
    public partial class Form1 : Form
    {
        bool Cal_Started, Res = false, Cltxt = true;
        int type, ltype;
        double first, second, result;
        public Form1()
        {
            InitializeComponent();
        }

        private void button_cls_Click(object sender, EventArgs e)
        {
            Cls();
        }

        public void Cls()
        {
            Cal_Started = false;
            Output.Text = "";
        }

        public void Cal()
        {
            Cltxt = true;
            if (Cal_Started == false)
            {
                Cal_Started = true;
                ltype = type;
                //try ... catch
                first = double.Parse(Output.Text);
            }
            else if (Cal_Started == true)
            {
                //try ... catch
                second = double.Parse(Output.Text);
                if (Res == true)
                {
                    switch (type)
                    {
                        case 1:
                            result = first   second;
                            break;
                        case 2:
                            result = first - second;
                            break;
                        case 3:
                            result = first * second;
                            break;
                        case 4:
                            result = first / second;
                            break;
                    }
                }
                else
                {
                    switch (ltype)
                    {
                        case 1:
                            result = first   second;
                            break;
                        case 2:
                            result = first - second;
                            break;
                        case 3:
                            result = first * second;
                            break;
                        case 4:
                            result = first / second;
                            break;
                    }

                }
                first = result;
                Output.Text = result.ToString();
            }
            
        }

        public void Input(string text)
        {
            if (Cltxt == false)
            {
                Output.Text  = text;
            }
            else
            {
                Output.Text = text;
                Cltxt = false;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Cal_Started = false;
        }

        private void button_0_Click(object sender, EventArgs e)
        {
            Input(button_0.Text);
        }

        private void button_1_Click(object sender, EventArgs e)
        {
            Input(button_1.Text);
        }

        private void button_2_Click(object sender, EventArgs e)
        {
            Input(button_2.Text);
        }

        private void button_3_Click(object sender, EventArgs e)
        {
            Input(button_3.Text);
        }

        private void button_4_Click(object sender, EventArgs e)
        {
            Input(button_4.Text);
        }

        private void button_5_Click(object sender, EventArgs e)
        {
            Input(button_5.Text);
        }

        private void button_6_Click(object sender, EventArgs e)
        {
            Input(button_6.Text);
        }

        private void button_7_Click(object sender, EventArgs e)
        {
            Input(button_7.Text);
        }

        private void button_8_Click(object sender, EventArgs e)
        {
            Input(button_8.Text);
        }

        private void button_9_Click(object sender, EventArgs e)
        {
            Input(button_9.Text);
        }

        private void button_add_Click(object sender, EventArgs e)
        {
            type = 1;
            Cal();
        }

        private void button_sub_Click(object sender, EventArgs e)
        {
            type = 2;
            Cal();
        }

        private void button_mul_Click(object sender, EventArgs e)
        {
            type = 3;
            Cal();
        }

        private void button_div_Click(object sender, EventArgs e)
        {
            type = 4;
            Cal();
        }

        private void button_dot_Click(object sender, EventArgs e)
        {
            if (Cltxt == true)
            {
                Output.Text = "0.";
                Cltxt = false;
            }
            else
            {
                Output.Text  = ".";
            }
        }

        private void button_res_Click(object sender, EventArgs e)
        {
            Res = true;
            Cal();
            Cal_Started = false;
        }
    }
}