Basic calculator program using C#

To create a calculator program in C#, you need to use Web Forms. Under that create buttons from 1-9, addition, subtraction, multiplication, etc.

Let us see the code for addition, subtraction, and multiplication. Firstly, we have declared two variables −

static float x, y;

Now, we will see how to set codes for calculation on individual button click: Our result textbox is tbResult since we have used Windows Form as well to display the calculator −

protected void add_Click(object sender, EventArgs e) {    x = Convert.ToInt32(tbResult.Text);    tbResult.Text = "";    y = '+';    tbResult.Text += y; } protected void sub_Click(object sender, EventArgs e) {    x = Convert.ToInt32(tbResult.Text);    tbResult.Text = "";    y = '-';    tbResult.Text += y; } protected void mul_Click(object sender, EventArgs e) {    x = Convert.ToInt32(tbResult.Text);    tbResult.Text = "";    y = '*';    tbResult.Text += y; }

The following is the equal button code −

protected void eql_Click(object sender, EventArgs e) {    z = Convert.ToInt32(tbResult.Text);    tbResult.Text = "";    if (y == '/') {       p = x / z;       tbResult.Text += p;       x = d;    } else if (y == '+') {       p = x + z;       tbResult.Text += p;       a = d;    } else if (y == '-') {       p = x - z;       tbResult.Text += p;       x = p;    } else {       p = x * z;       tbResult.Text += p;       x = p;    } }