namespace Problem2BookClubPoints_CalebFontenot
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void okButton_Click(object sender, EventArgs e)
        {


         try
            {
                // Define variables
                int booksPurchased,
                    pointsEarned = 0;


                // Get data
                booksPurchased = int.Parse(booksPurchasedTextBox.Text);

                // Determine points earned with if logic:
                if (booksPurchased >= 4)
                {
                    pointsEarned = 60;
                }
                if (booksPurchased == 3)
                {
                    pointsEarned = 30;
                }
                if (booksPurchased == 2)
                {
                    pointsEarned = 15;
                }
                if (booksPurchased == 1)
                {
                    pointsEarned = 5;
                }
                if (booksPurchased == 0)
                {
                    pointsEarned = 0;
                }

                // Write pointsEarned to textbox.
                pointsTextBox.Text = pointsEarned.ToString();
            }
         catch
            {
                MessageBox.Show("Invalid Input");
            }


        }
        private void exitButton_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}