calculator.cs

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 WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        static double total=0;
        static double temp;
        static bool isPlused = false;
        static bool isMinus = false;
        static bool isMultiplied = false;
        static bool isDivided = false;
        static bool isFacted = false;
        static bool isPowered = false;
        static bool isSquared = false;
        public Form1()
        {
            InitializeComponent();
            buttonSqrt.Text = "\u221A";
            buttonReset.Enabled = false;
        }
        #region Reset-QuadraticFormular
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            buttonReset.Enabled = true;
            panel2.Hide();
            panel1.Show();
            panel3.Enabled = false;
            label1.Text = "Reza is handsome";
            label1.Enabled = true;
        }
 
        private void buttonReset_Click(object sender, EventArgs e)
        {
            panel1.Hide();
            panel2.Show();
            foreach (Control c in this.Controls)
            {
                c.Enabled = true ;
            }
            textBoxA.Clear();
            textBoxB.Clear();
            textBoxC.Clear();
            labelX1.Text = "X1 =";
            labelX2.Text = "X2 =";
            label1.Text = "";
            buttonReset.Enabled = false;
        }

        private void buttoncalc_Click(object sender, EventArgs e)
        {
            double a = double.Parse(textBoxA.Text);
            double b = double.Parse(textBoxB.Text);
            double c = double.Parse(textBoxC.Text);
            double delta = Math.Pow(b, 2) - 4 * a * c;
            if (delta==0)
            {
                labelX1.Text += Convert.ToString(-b / (2 * a));
                labelX2.Text += Convert.ToString(-b / (2 * a));
            }
            else
            {
                if (delta > 0)
                {
                    labelX1.Text += Convert.ToString((-b - Math.Sqrt(delta)) / (2 * a));
                    labelX2.Text += Convert.ToString((-b + Math.Sqrt(delta)) / (2 * a));
                }
                else
                {
                    MessageBox.Show("There is no solution for this equation!");
                };
            }
        }
        #endregion

        #region x^2, x! and sqrt(x)

        private void buttonS1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Text += "!";
                isPlused = false;
                isMinus = false;
                isMultiplied = false;
                isDivided = false;
                isFacted = true;
                isPowered = false;
                isSquared = false;
            }
            else
            { }
        }

        private void buttonPower2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Text += "^2";
                isPlused = false;
                isMinus = false;
                isMultiplied = false;
                isDivided = false;
                isFacted = false;
                isPowered = true;
                isSquared = false;
            }
            else
            {
            }
        }

        private void buttonSqrt_Click(object sender, EventArgs e)
        {
            textBox1.Text = "\u221A" + textBox1.Text;
            isPlused = false;
            isMinus = false;
            isMultiplied = false;
            isDivided = false;
            isFacted = false;
            isPowered = false;
            isSquared = true;
        }

        #endregion

        #region 0-9
        private void button0_Click(object sender, EventArgs e)
        {
            textBox1.Text += button0.Text;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text += button1.Text;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text += button2.Text;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text += button3.Text;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += button4.Text;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text += button5.Text;
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += button6.Text;
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += button7.Text;
        }

        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text += button8.Text;
        }

        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text += button9.Text;
        }
        #endregion

        #region Settings
        private void buttonDel_Click(object sender, EventArgs e)
        {
            textBox1.Clear();
        }

        private void buttondot_Click(object sender, EventArgs e)
        {
            MessageBox.Show("No function for this yet, sorry ^^");
        }

        private void buttone_Click(object sender, EventArgs e)
        {
            MessageBox.Show("No function for this yet, sorry ^^");
        }

        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text=textBox1.Text.Substring(0, textBox1.Text.Length - 1);
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (textBox1.Text.Length == 0)
                button10.Enabled = false;
            else
                button10.Enabled = true;
        }
        #endregion

        #region Equal Button
        private void buttonEqual_Click(object sender, EventArgs e)
        {
            if (isPlused == true)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Text = Convert.ToString(total);
                total = 0;
            }
            else if (isMinus == true)
            {
                total = total - double.Parse(textBox1.Text);
                textBox1.Text = Convert.ToString(total);
                total = 0;
            }
            else if (isMultiplied == true)
            {
                total = total * double.Parse(textBox1.Text);
                textBox1.Text = Convert.ToString(total);
                total = 0;
            }
            else if (isDivided == true)
            {
                total = total / double.Parse(textBox1.Text);
                textBox1.Text = Convert.ToString(total);
                total = 0;
            }
            else if (isFacted == true)
            {
                for (double i = total - 1; i > 0; i--)
                {
                    total = total * i;
                };
                textBox1.Text = Convert.ToString(total);
                total = 0;
            }
            else if (isPowered == true)
            {
                textBox1.Text = Convert.ToString(Math.Pow(total, 2));
                total = 0;
            }
            else if (isSquared == true)
            {
                textBox1.Text=textBox1.Text.Remove(0, 1);
                total = double.Parse(textBox1.Text);
                textBox1.Text = Convert.ToString(Math.Sqrt(total));
                total = 0;
            }

        }
        #endregion

        #region + - x /
        private void buttonX_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Clear();
                isPlused = false;
                isMinus = false;
                isMultiplied = true;
                isDivided = false;
                isFacted = false;
                isPowered = false;
                isSquared = false;
            }
            else { }
        }

        private void buttonDiv_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Clear();
                isPlused = false;
                isMinus = false;
                isMultiplied = false;
                isDivided = true;
                isFacted = false;
                isPowered = false;
                isSquared = false;
            }
            else { }
        }

        private void buttonAdd_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Clear();
                isPlused = true;
                isMinus = false;
                isMultiplied = false;
                isDivided = false;
                isFacted = false;
                isPowered = false;
                isSquared = false;
            }
            else { }
        }


        private void buttonSub_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length != 0)
            {
                total = total + double.Parse(textBox1.Text);
                textBox1.Clear();
                isPlused = false;
                isMinus = true;
                isMultiplied = false;
                isDivided = false;
                isFacted = false;
                isPowered = false;
                isSquared = false;
            }
            else { }
        }

        #endregion

    }
}