string last = ""; bool minus = false; bool plus = false; bool divide = false; bool multiply = false; string memory = ""; public Form1() { InitializeComponent(); } private void button2_Click(object sender, EventArgs e) { if (textBox1.Text.Contains(",")) { return;

C#(Sharp): I made my code and design below. Anybody can help me some correction and add some design button and code. "Need to make C# step by step design and code "Calculator where make a calculator program that can do add, subtract, multiply, divide and square root. It should have a memory save/restore function for one number. There should be a way to set the number of fraction digits displayed".

• Code:

• 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 AktCalc

  {

  public partial class Form1 : Form

  {

  string last = "";

  bool minus = false;

  bool plus = false;

  bool divide = false;

  bool multiply = false;

  string memory = "";

  public Form1()

  {

  InitializeComponent();

  }

  private void button2_Click(object sender, EventArgs e)

  {

• if (textBox1.Text.Contains(","))

  {

  return;

  }

  else

  {

  textBox1.Text += ",";

  }

  }

  private void button21_Click(object sender, EventArgs e)

  {

  last = textBox1.Text;

  multiply = true;

  }

  private void button3_Click(object sender, EventArgs e)

  {

  last = textBox1.Text;

  plus = true;

  }

  private void button5_Click(object sender, EventArgs e)

  {

  last = textBox1.Text;

  divide = true;

  }

• private void button4_Click(object sender, EventArgs e)

  {

  last = textBox1.Text;

  minus = true;

  }

  // Equalls =

  private void button6_Click(object sender, EventArgs e)

  {

  if (minus)

  {

  decimal equals1;

  equals1 = Convert.ToDecimal(last) - Convert.ToDecimal(textBox1.Text);

  textBox1.Text = Convert.ToString(equals1);

  }

  if (plus)

  {

  decimal equals1;

  equals1 = Convert.ToDecimal(last) + Convert.ToDecimal(textBox1.Text);

  textBox1.Text = Convert.ToString(equals1);

  }

  if (divide)

  {

  decimal equals1;

• equals1 = Convert.ToDecimal(last) / Convert.ToDecimal(textBox1.Text);

  textBox1.Text = Convert.ToString(equals1);

  }

  if (multiply)

  {

  decimal equals1;

  equals1 = Convert.ToDecimal(last) * Convert.ToDecimal(textBox1.Text);

  textBox1.Text = Convert.ToString(equals1);

  }

  }

  private void button16_Click(object sender, EventArgs e)

  {

  textBox1.Text = Convert.ToString(Math.Sqrt(Convert.ToDouble(textBox1.Text)));

  }

  private void button1_Click(object sender, EventArgs e)

  {

  memory = textBox1.Text;

  label1.Text = "M";

  }

  private void button10_Click(object sender, EventArgs e)

  {

  memory = "";

  label1.Text = "";

  }

• private void button15_Click(object sender, EventArgs e)

  {

  textBox1.Text = memory;

  }

  private void button11_Click(object sender, EventArgs e)

  {

  textBox1.Text = "";

  multiply = false;

  plus = false;

  minus = false;

  divide = false;

  }

  private void button20_Click(object sender, EventArgs e)

  {

  textBox1.Text += "0";

  }

  private void button19_Click(object sender, EventArgs e)

  {

  textBox1.Text += "1";

  }

  private void button18_Click(object sender, EventArgs e)

  {

• textBox1.Text += "2";

  }

  private void button17_Click(object sender, EventArgs e)

  {

  textBox1.Text += "3";

  }

  private void button14_Click(object sender, EventArgs e)

  {

  textBox1.Text += "4";

  }

  private void button13_Click(object sender, EventArgs e)

  {

  textBox1.Text += "5";

  }

  private void button12_Click(object sender, EventArgs e)

  {

  textBox1.Text += "6";

  }

  private void button9_Click(object sender, EventArgs e)

  {

  textBox1.Text += "7";

  }

• private void button8_Click(object sender, EventArgs e)

  {

  textBox1.Text += "8";

  }

  }

  }