Scientific Calculator

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Introduction

This is a scientific calculator that calculates fibonacci modulo factorial sin cos tan.. you are also able to change the background color and color of the buttons.

Using the Code

// using button number 1
private void button1_Click(object sender, EventArgs e)
{
    but_backspace.Enabled = true;        // number button is clicked, enable backspace
    but_backspace.BackColor = Color.LightCoral; // color button when enabled

    if (isOperation == true)          // if we used an operation clear output
        {textBox_output.Text = "";}   // empty output

    if (tempSign == "Sminus")
        { textBox_output.Text += "-1"; }

    else
        textBox_output.Text += "1";    // add 1 to output
        isOperation = false;           // no operation pressed yet
}

// using addition button
private void button12_Click(object sender, EventArgs e)
{
    if (textBox_output.Text == "")
    { // to prevent exception appearing
    }
    else
    {
        Operations.add(double.Parse(textBox_output.Text));
        textBox_output.Text = Convert.ToString(Operations.getResult());
        isOperation = true; // user pressed an operation
        tempSign = "plus";
    }
}

// factorial method
public static long factorial(long num)
{
    if(num >= 21 || num < 0)
    {
        MessageBox.Show("Enter number between 0 & 20",
        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return 0;
    }
    else
    {
        if(num <= 1)
            return 1;
        else
            return num * factorial(num - 1); // recursive function
    }
}