using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace CalculatorApp
{
public partial class Form1 : Form
{
double FirstNumber;
string Operation;
public Form1()
{
InitializeComponent();
}
private void n1_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "1";
}
else
{
textBox1.Text = textBox1.Text + "1";
}
}
private void n2_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "2";
}
else
{
textBox1.Text = textBox1.Text + "2"; }
}
private void n3_Click(object sender, EventArgs e) {
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "3";
}
else
{
textBox1.Text = textBox1.Text + "3";
}
}
private void n4_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "4";
}
else
{
textBox1.Text = textBox1.Text + "4";
}
}
private void n5_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "5";
}
else
{
textBox1.Text = textBox1.Text + "5";
}
}
private void n6_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "6";
}
else
{
textBox1.Text = textBox1.Text + "6";
}
}
private void n7_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "7";
}
else
{
textBox1.Text = textBox1.Text + "7";
}
}
private void n8_Click(object sender, EventArgs e)
{
if (textBox1.Text == "0" && textBox1.Text != null)
{
textBox1.Text = "8";
}
else
{
textBox1.Text = textBox1.Text + "8";
}
}
private void n9_Click(object sender, EventArgs e)
{
if (textBox1.Text == "" && textBox1.Text != null)
{
textBox1.Text = "9";
}
else
{
textBox1.Text = textBox1.Text + "9";
}
}
private void n0_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "0";
}
private void bad_Click(object sender, EventArgs e)
{
FirstNumber = Convert.ToDouble(textBox1.Text);
textBox1.Text = "0";
Operation = "+";
}
private void bsub_Click(object sender, EventArgs e)
{
FirstNumber = Convert.ToDouble(textBox1.Text);
textBox1.Text = "0";
Operation = "-";
}
private void bmul_Click(object sender, EventArgs e)
{
FirstNumber = Convert.ToDouble(textBox1.Text);
textBox1.Text = "0";
Operation = "*";
}
private void bdiv_Click(object sender, EventArgs e)
{
FirstNumber = Convert.ToDouble(textBox1.Text);
textBox1.Text = "0";
Operation = "/";
}
private void bc_Click(object sender, EventArgs e)
{
textBox1.Text = "0";
}
private void ndot_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + ".";
}
private void nequal_Click(object sender, EventArgs e)
{
double SecondNumber;
double Result;
SecondNumber = Convert.ToDouble(textBox1.Text);
if (Operation == "+")
{
Result = (FirstNumber + SecondNumber);
textBox1.Text = Convert.ToString(Result);
FirstNumber = Result;
}
if (Operation == "-")
{
Result = (FirstNumber - SecondNumber);
textBox1.Text = Convert.ToString(Result);
FirstNumber = Result;
}
if (Operation == "*")
{
Result = (FirstNumber * SecondNumber);
textBox1.Text = Convert.ToString(Result);
FirstNumber = Result;
}
if (Operation == "/")
{
if (SecondNumber == 0)
{
textBox1.Text = "Cannot divide by zero";
}
else
{
Result = (FirstNumber / SecondNumber);
textBox1.Text = Convert.ToString(Result);
FirstNumber = Result;
}
}
}
}
}
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