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 WindowsFormsApplication2_Login_
{
public partial class Calculator : Form
{
public Calculator()
{
InitializeComponent();
}
public void disable()
{
button13.Hide();
button1.Show();
button20.Enabled = false;
button19.Enabled = false;
button18.Enabled = false;
button17.Enabled = false;
button16.Enabled = false;
button15.Enabled = false;
button14.Enabled = false;
button13.Enabled = false;
button12.Enabled = false;
button11.Enabled = false;
button10.Enabled = false;
button9.Enabled = false;
button8.Enabled = false;
button7.Enabled = false;
button6.Enabled = false;
button5.Enabled = false;
button4.Enabled = false;
button3.Enabled = false;
button2.Enabled = false;
}
public void enable()
{
button1.Hide();
button13.Show();
button20.Enabled = true;
button19.Enabled = true;
button18.Enabled = true;
button17.Enabled = true;
button16.Enabled = true;
button15.Enabled = true;
button14.Enabled = true;
button12.Enabled = true;
button11.Enabled = true;
button10.Enabled = true;
button9.Enabled = true;
button8.Enabled = true;
button7.Enabled = true;
button6.Enabled = true;
button5.Enabled = true;
button4.Enabled = true;
button2.Enabled = true;
}
float num, ans;
int count;
public void compute()
{
switch(count)
{
case 1:
ans = num + float.Parse(textBox1.Text);
textBox1.Text = ans.ToString();
break;
case 2:
ans = num - float.Parse(textBox1.Text);
textBox1.Text = ans.ToString();
break;
case 3:
ans = num / float.Parse(textBox1.Text);
textBox1.Text = ans.ToString();
break;
case 4:
ans = num * float.Parse(textBox1.Text);
textBox1.Text = ans.ToString();
break;
}
}
private void button17_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 0;
textBox1.ForeColor = Color.Red;
}
private void button18_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + ".";
textBox1.ForeColor = Color.Red;
}
private void button14_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 1;
textBox1.ForeColor = Color.Red;
}
private void button15_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 2;
textBox1.ForeColor = Color.Red;
}
private void button16_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 3;
textBox1.ForeColor = Color.Red;
}
private void button9_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 4;
textBox1.ForeColor = Color.Red;
}
private void button10_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 5;
textBox1.ForeColor = Color.Red;
}
private void button11_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 6;
textBox1.ForeColor = Color.Red;
}
private void button5_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 7;
textBox1.ForeColor = Color.Red;
}
private void button6_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 8;
textBox1.ForeColor = Color.Red;
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + 9;
textBox1.ForeColor = Color.Red;
}
private void button1_Click(object sender, EventArgs e)//On Button
{
enable();
}
private void button13_Click(object sender, EventArgs e)//Off Button
{
disable();
}
private void button4_Click(object sender, EventArgs e)
{
num = float.Parse(textBox1.Text);
textBox1.Clear();
textBox1.Focus();
count = 1;
label1.Text = num.ToString() + "+";
}
private void button8_Click(object sender, EventArgs e)
{
num = float.Parse(textBox1.Text);
textBox1.Clear();
textBox1.Focus();
count = 1;
label1.Text = num.ToString() + "-";
}
private void button3_Click(object sender, EventArgs e)
{
num = float.Parse(textBox1.Text);
textBox1.Clear();
textBox1.Focus();
count = 1;
label1.Text = num.ToString() + "*";
}
private void button12_Click(object sender, EventArgs e)
{
num = float.Parse(textBox1.Text);
textBox1.Clear();
textBox1.Focus();
count = 1;
label1.Text = num.ToString() + "/";
}
private void button19_Click(object sender, EventArgs e)
{
compute();
label1.Text = "";
}
private void button20_Click(object sender, EventArgs e)
{
textBox1.Text = "";
}
private void button2_Click(object sender, EventArgs e)
{
int lenght = textBox1.TextLength - 1;
string text = textBox1.Text;
textBox1.Clear();
for (int i = 0; i < lenght; i++)
textBox1.Text = textBox1.Text + text[i];
}
}
}