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
	{
		double f, s;
		double sum;
		bool root = false;
		public Form1()
		{
			InitializeComponent();
		}

		private void textBox1_TextChanged(object sender, EventArgs e)
		{

		}
		public string Calc(string n)
		{

			if (n.Contains("-") || n.Contains("+") || n.Contains("*") || n.Contains("/") || n.Contains("^") || n.Contains("√") || n.Contains("("))
			{
				if (n.Contains("("))
				{
					return n = Calc((n.Substring(0,n.IndexOf('(')))+Calc(n.Substring(n.IndexOf('(') + 1, (n.IndexOf(')') - n.IndexOf('(') - 1)))+n.Substring(n.IndexOf(')') + 1));
				}
				if (n.Contains("-"))
				{
					return (double.Parse(Calc(n.Substring(0, n.IndexOf('-')))) - double.Parse(Calc(n.Substring(n.IndexOf('-') + 1)))).ToString();
				}
				else if (n.Contains("+"))
				{
					return (double.Parse(Calc(n.Substring(0, n.IndexOf('+')))) + double.Parse(Calc(n.Substring(n.IndexOf('+') + 1)))).ToString();
				}

				else if (n.Contains("*"))
				{
					return (double.Parse(Calc(n.Substring(0, n.IndexOf('*')))) * double.Parse(Calc(n.Substring(n.IndexOf('*') + 1)))).ToString();
				}
				else if (n.Contains("/"))
				{
					return (double.Parse(Calc(n.Substring(0, n.IndexOf('/')))) / double.Parse(Calc(n.Substring(n.IndexOf('/') + 1)))).ToString();
				}
				else if (n.Contains("^"))
				{
					return (Math.Pow(double.Parse(Calc(n.Substring(0, n.IndexOf('^')))), double.Parse(Calc(n.Substring(n.IndexOf('^') + 1))))).ToString();
				}
				else //if (n.Contains("√"))
				{
					n = n.Remove(n.IndexOf("√"), 1);

					return (Math.Sqrt(double.Parse(Calc(n)))).ToString();
				}

			}
			else
				return n;
		}
		private void Equal(object sender, EventArgs e)
		{
			textBox1.Text = Calc(textBox1.Text);
		}

		private void button1_Click_1(object sender, EventArgs e)//-
		{
			textBox1.Text += "-";
			textBox1.CursorChanged += button1_Click_1;
		}

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

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

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

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

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

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

		private void button6_Click(object sender, EventArgs e)//√
		{
			textBox1.Text += "√";

		}
	}
}



------------------



namespace WindowsFormsApp1
{
	partial class Form1
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components = null;

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
		protected override void Dispose(bool disposing)
		{
			if (disposing && (components != null))
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		#region Windows Form Designer generated code

		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);
			this.azToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.toolStripComboBox1 = new System.Windows.Forms.ToolStripComboBox();
			this.azToolStripMenuItem1 = new System.Windows.Forms.ToolStripMenuItem();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			this.button5 = new System.Windows.Forms.Button();
			this.button6 = new System.Windows.Forms.Button();
			this.button7 = new System.Windows.Forms.Button();
			this.button8 = new System.Windows.Forms.Button();
			this.button9 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			//
			// contextMenuStrip1
			//
			this.contextMenuStrip1.Name = "contextMenuStrip1";
			this.contextMenuStrip1.Size = new System.Drawing.Size(61, 4);
			//
			// azToolStripMenuItem
			//
			this.azToolStripMenuItem.Name = "azToolStripMenuItem";
			this.azToolStripMenuItem.Size = new System.Drawing.Size(32, 19);
			//
			// toolStripComboBox1
			//
			this.toolStripComboBox1.Name = "toolStripComboBox1";
			this.toolStripComboBox1.Size = new System.Drawing.Size(121, 23);
			//
			// azToolStripMenuItem1
			//
			this.azToolStripMenuItem1.Name = "azToolStripMenuItem1";
			this.azToolStripMenuItem1.Size = new System.Drawing.Size(32, 19);
			//
			// textBox1
			//
			this.textBox1.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
			this.textBox1.Location = new System.Drawing.Point(232, 59);
			this.textBox1.Multiline = true;
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(306, 68);
			this.textBox1.TabIndex = 2;
			this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
			this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
			//
			// button1
			//
			this.button1.Location = new System.Drawing.Point(232, 188);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(72, 49);
			this.button1.TabIndex = 3;
			this.button1.Text = "-";
			this.button1.UseVisualStyleBackColor = true;
			this.button1.Click += new System.EventHandler(this.button1_Click_1);
			//
			// button2
			//
			this.button2.Location = new System.Drawing.Point(310, 188);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(72, 49);
			this.button2.TabIndex = 4;
			this.button2.Text = "+";
			this.button2.UseVisualStyleBackColor = true;
			this.button2.Click += new System.EventHandler(this.button2_Click);
			//
			// button3
			//
			this.button3.Location = new System.Drawing.Point(388, 188);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(72, 49);
			this.button3.TabIndex = 5;
			this.button3.Text = "*";
			this.button3.UseVisualStyleBackColor = true;
			this.button3.Click += new System.EventHandler(this.button3_Click);
			//
			// button4
			//
			this.button4.Location = new System.Drawing.Point(466, 188);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(72, 49);
			this.button4.TabIndex = 6;
			this.button4.Text = "/";
			this.button4.UseVisualStyleBackColor = true;
			this.button4.Click += new System.EventHandler(this.button4_Click);
			//
			// button5
			//
			this.button5.Location = new System.Drawing.Point(232, 243);
			this.button5.Name = "button5";
			this.button5.Size = new System.Drawing.Size(72, 49);
			this.button5.TabIndex = 7;
			this.button5.Text = "^";
			this.button5.UseVisualStyleBackColor = true;
			this.button5.Click += new System.EventHandler(this.button5_Click);
			//
			// button6
			//
			this.button6.Location = new System.Drawing.Point(310, 243);
			this.button6.Name = "button6";
			this.button6.Size = new System.Drawing.Size(72, 49);
			this.button6.TabIndex = 8;
			this.button6.Text = "√";
			this.button6.UseVisualStyleBackColor = true;
			this.button6.Click += new System.EventHandler(this.button6_Click);
			//
			// button7
			//
			this.button7.Location = new System.Drawing.Point(388, 243);
			this.button7.Name = "button7";
			this.button7.Size = new System.Drawing.Size(150, 49);
			this.button7.TabIndex = 9;
			this.button7.Text = "=";
			this.button7.UseVisualStyleBackColor = true;
			this.button7.Click += new System.EventHandler(this.Equal);
			//
			// button8
			//
			this.button8.Location = new System.Drawing.Point(388, 133);
			this.button8.Name = "button8";
			this.button8.Size = new System.Drawing.Size(150, 49);
			this.button8.TabIndex = 11;
			this.button8.Text = ")";
			this.button8.UseVisualStyleBackColor = true;
			this.button8.Click += new System.EventHandler(this.button8_Click);
			//
			// button9
			//
			this.button9.Location = new System.Drawing.Point(232, 133);
			this.button9.Name = "button9";
			this.button9.Size = new System.Drawing.Size(150, 49);
			this.button9.TabIndex = 10;
			this.button9.Text = "(";
			this.button9.UseVisualStyleBackColor = true;
			this.button9.Click += new System.EventHandler(this.button9_Click);
			//
			// Form1
			//
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(800, 450);
			this.Controls.Add(this.button8);
			this.Controls.Add(this.button9);
			this.Controls.Add(this.button7);
			this.Controls.Add(this.button6);
			this.Controls.Add(this.button5);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);
			this.PerformLayout();

		}

		#endregion

		private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
		private System.Windows.Forms.ToolStripMenuItem azToolStripMenuItem;
		private System.Windows.Forms.ToolStripComboBox toolStripComboBox1;
		private System.Windows.Forms.ToolStripMenuItem azToolStripMenuItem1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.Button button5;
		private System.Windows.Forms.Button button6;
		private System.Windows.Forms.Button button7;
		private System.Windows.Forms.Button button8;
		private System.Windows.Forms.Button button9;
	}
}