02週作業 進階小算盤

1.程式碼

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 Calculator
{
    public partial class Form1 : Form
    {
        bool isFirstDigit = true/* 是否為第一個數字*/, isOP1 = true/* 是否為第一個運算元*/, isOP2 = true; /*判斷在txtop1或txtop2*/
        double result = 0, op1 = 0, op2 = 0;
        char op;//放置加減乘除
        int d1 = 1;

        public Form1()
        {
            InitializeComponent();
        }
        private void calc_result() //計算結果
        {
            if (txtOp.Text.Equals("") || txtOp1.Text.Equals("") || txtOp2.Text.Equals("")) return;
            op1 = double.Parse(txtOp1.Text);
            op2 = double.Parse(txtOp2.Text);
            switch (op)
            {
                case '+':
                    result = op1 + op2; break;
                case '-':
                    result = op1 - op2; break;
                case '*':
                    result = op1 * op2; break;
                case '/':
                    result = op1 / op2; break;
            }

            txtResult.Text = result.ToString();
            txtOp1.Text = result.ToString();

        }
        private void btnEqual_Click(object sender, EventArgs e) //等號按鈕按下
        {
            if (txtOp.Text.Equals("") || txtOp1.Text.Equals("") || txtOp2.Text.Equals("")) return;
            if (!txtOp2.Text.Equals("0")) calc_result(); txtOp2.Text = ""; isOP2 = true;
            txtRecord.Text = ""; d1 = 0;
        }

        private void btnNums_Click(object sender, EventArgs e) //數字按鈕按下
        {

            Button b = (Button)sender;
            if (isFirstDigit)
            {
                if (b.Text.Equals("0")) return;
                else
                {
                    isFirstDigit = false;
                }
            }

            if (isOP1)
            {
                txtOp1.Text += b.Text.ToString();
                txtRecord.Text += b.Text.ToString();
                isOP2 = true;
            }
            else
            {
                txtOp2.Text += b.Text.ToString();
                txtRecord.Text += b.Text.ToString();
                isOP2 = false;
            }
        }

        private void btnOperator_Click(object sender, EventArgs e) //+-/*按鈕按下
        {
            isFirstDigit = false;
            calc_result();
            if (txtOp1.Text != "") txtRecord.Text = txtOp1.Text;
            //else txtRecord.Text = txtResult.Text;
            if (isFirstDigit) return;
            Button b = (Button)sender;
            op = b.Text[0];
            txtRecord.Text += op;
            txtOp.Text = b.Text;
            if (isOP1) isOP1 = false;
            isFirstDigit = true;
            isOP2 = false;
            txtOp2.Text = "";

        }

        private void Clear_Click(object sender, EventArgs e) //C清楚按鈕
        {
            isFirstDigit = true;
            isOP1 = true;
            result = 0; op1 = 0; op2 = 0; op = ' ';
            txtResult.Text = "0"; txtOp.Text = ""; txtRecord.Text = "";
            txtOp1.Text = ""; txtOp2.Text = ""; txtOp3.Text = "";
        }

        private void M_Click(object sender, EventArgs e) //記憶數字
        {
            if (isOP2 == true) txtOp3.Text = txtOp1.Text;
            else txtOp3.Text = txtOp2.Text;
        }

        private void R_Click(object sender, EventArgs e) //取的記憶的數字
        {
            if (txtOp3.Text != "") txtOp2.Text = txtOp3.Text;
        }

        private void Back_bt(object sender, EventArgs e)//倒退按鈕
        {
            string ch;
            if (d1 != 0)
            {
                if (txtRecord.Text.Length > 0)
                {
                    ch = txtRecord.Text.Substring(0, txtRecord.Text.Length - 1);
                    txtRecord.Text = ch;
                }

            }
            else
            {
                if (txtOp2.Text == "")
                {
                    if (txtResult.Text.Length > 0)
                    {
                        ch = txtResult.Text.Substring(0, txtResult.Text.Length - 1);
                        txtResult.Text = ch;
                    }

                }
                else
                {
                    ch = txtRecord.Text.Substring(0, txtRecord.Text.Length - 1);
                    txtRecord.Text = ch;
                }
            }
            if (isOP2 == true)
            {
                ch = txtOp1.Text;
                ch = ch.Substring(0, ch.Length - 1);
                txtOp1.Text = ch;
            }
            if (isOP2 == false)
            {
                ch = txtOp2.Text;
                ch = ch.Substring(0, ch.Length - 1);
                txtOp2.Text = ch;
            }
        }
    }
}

2.流程圖

3.程式結果

4.執行過程影片