(1) Write a C# Program for Basic Calculator which can

handle addition, subtraction, multiplication, and division.

Source 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 Calc { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void pictureBox1_Click(object sender, EventArgs e) { } private void Form1_Load(object sender, EventArgs e) { } float number1 , number2 , add , sub , mul ,div; private void button1_Click(object sender, EventArgs e) { number1 = Convert.ToInt32(textBox1.Text); number2 = Convert.ToInt32(textBox2.Text); add = number1 + number2; textBox3.Text = add.ToString(); }

private void button2_Click(object sender, EventArgs e) { number1 = Convert.ToInt32(textBox1.Text); number2 = Convert.ToInt32(textBox2.Text); sub = number1 - number2; textBox3.Text = sub.ToString(); } private void button3_Click(object sender, EventArgs e) { number1 = Convert.ToInt32(textBox1.Text); number2 = Convert.ToInt32(textBox2.Text); mul = number1 * number2; textBox3.Text = mul.ToString(); } private void button4_Click(object sender, EventArgs e) { number1 = Convert.ToInt32(textBox1.Text); number2 = Convert.ToInt32(textBox2.Text); div = number1 / number2; textBox3.Text = div.ToString(); } } }

Output: