simple Calculator

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 csharp_tt2



{

public partial class calculator : Form



{

String original_text;

string first_opernd;

string second_oprend;

String operator_used;

float result;

float second;

float first;

public calculator()



{

InitializeComponent();

}

private void button7_Click(object sender, EventArgs e)



{

String str = "5";



rtxt.Text += str;

}

private void calculator_Load(object sender, EventArgs e)



{

}

private void zero_Click(object sender, EventArgs e)



{

String str = "0";



rtxt.Text += str;

}

private void one_Click(object sender, EventArgs e)



{

String str = "1";



rtxt.Text += str;

}

private void Dot_Click(object sender, EventArgs e)



{

String str = ".";



rtxt.Text += str;

Dot.Enabled = false;



}

private void two_Click(object sender, EventArgs e)



{

String str = "2";



rtxt.Text += str;

}

private void three_Click(object sender, EventArgs e)



{

String str = "3";



rtxt.Text += str;

}

private void four_Click(object sender, EventArgs e)



{

String str = "4";



rtxt.Text += str;

}

private void six_Click(object sender, EventArgs e)



{

String str = "6";



rtxt.Text += str;

}

private void seven_Click(object sender, EventArgs e)



{

String str = "7";



rtxt.Text += str;

}

private void eight_Click(object sender, EventArgs e)



{

String str = "8";



rtxt.Text += str;

}

private void nine_Click(object sender, EventArgs e)



{

String str = "9";



rtxt.Text += str;

}

private void clear_Click(object sender, EventArgs e)



{

Dot.Enabled = true;

rtxt.Text = "";

first_opernd = "";

second_oprend = "";



}

private void addition_Click(object sender, EventArgs e)



{

first_opernd = rtxt.Text;

operator_used = "+";

rtxt.Text = "";



}

private void subtract_Click(object sender, EventArgs e)



{

first_opernd = rtxt.Text;

operator_used = "-";

rtxt.Text = "";



}

private void multiply_Click(object sender, EventArgs e)



{

first_opernd = rtxt.Text;

operator_used = "*";

rtxt.Text = "";



}

private void divide_Click(object sender, EventArgs e)



{

first_opernd = rtxt.Text;

operator_used = "/";

rtxt.Text = "";



}

private void equal_Click(object sender, EventArgs e)



{

switch(operator_used){

case "+":



second_oprend = rtxt.Text;

first = float.Parse(first_opernd);

second = float.Parse(second_oprend);



result = first + second;

rtxt.Text = result.ToString();

break;

case "-":



second_oprend = rtxt.Text;

first = float.Parse(first_opernd);

second = float.Parse(second_oprend);



result = first - second;

rtxt.Text = result.ToString();

break;

case "*":



second_oprend = rtxt.Text;

first = float.Parse(first_opernd);

second = float.Parse(second_oprend);



result = first * second;

rtxt.Text = result.ToString();

break;

case "/":





second_oprend = rtxt.Text;

if (second_oprend == "0")



{

rtxt.Text = "undifined error";



}

else



{

first = float.Parse(first_opernd);

second = float.Parse(second_oprend);



result = first / second;

rtxt.Text = result.ToString();

}

break;



}

}

}

}


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