using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Calculator
{
public partial class Form1 : Form
{
Double resultValue = 0;
String operationPerformed = "";
bool isOperationPerformed = false;
public Form1()
{
InitializeComponent();
}
private void button_click(object sender, EventArgs e)
{
if ((textBox_Result.Text == "0") || (isOperationPerformed))
textBox_Result.Clear();
isOperationPerformed = false;
Button button = (Button)sender;
if (button.Text == ".")
{
if(!textBox_Result.Text.Contains("."))
textBox_Result.Text = textBox_Result.Text + button.Text;
}else
textBox_Result.Text = textBox_Result.Text + button.Text;
private void operator_click(object sender, EventArgs e)
{
Button button = (Button)sender;
if (resultValue != 0)
{
button15.PerformClick();
operationPerformed = button.Text;
labelCurrentOperation.Text = resultValue + " " + operationPerformed;
isOperationPerformed = true;
}
else
{
operationPerformed = button.Text;
resultValue = Double.Parse(textBox_Result.Text);
labelCurrentOperation.Text = resultValue + " " + operationPerformed;
isOperationPerformed = true;
}
}
private void button4_Click(object sender, EventArgs e)
{
textBox_Result.Text = "0";
}
private void button5_Click(object sender, EventArgs e)
{
textBox_Result.Text = "0";
resultValue = 0;
}
private void button15_Click(object sender, EventArgs e)
{
switch (operationPerformed)
{
case "+":
textBox_Result.Text = (resultValue +
Double.Parse(textBox_Result.Text)).ToString();
break;
case "-":
textBox_Result.Text = (resultValue -
Double.Parse(textBox_Result.Text)).ToString();
break;
case "*":
textBox_Result.Text = (resultValue *
Double.Parse(textBox_Result.Text)).ToString();
break;
case "/":
textBox_Result.Text = (resultValue /
Double.Parse(textBox_Result.Text)).ToString();
break;
default:
break;
}
resultValue = Double.Parse(textBox_Result.Text);
labelCurrentOperation.Text = "";
}
}
}
//How to Create a Calculator in Visual Studio C#
//
