using System;
using System.Windows.Forms;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void CalcBtn_Click(object sender, EventArgs e)
        {
            if (!GetAB(out int a, out int b))
            {
                MessageBox.Show("Incorrect values.");
                return;
            }

            var obj = new B(a, b);
            InfoListBox.Items.Add($"{a} + {b} + 15 = {obj.M}");
        }

        private void CalcDefaultBtn_Click(object sender, EventArgs e)
        {
            if (!GetAB(out int a, out int b))
            {
                MessageBox.Show("Incorrect values.");
                return;
            }

            var obj = new B();
            InfoListBox.Items.Add($"3 + 5 + 15 = {obj.M}");
        }

        private void ShowC1Btn_Click(object sender, EventArgs e)
        {
            if (!GetAB(out int a, out int b))
            {
                MessageBox.Show("Incorrect values.");
                return;
            }

            var obj = new A(a, b);
            InfoListBox.Items.Add($"a++ = {obj.C1}");
        }

        private void ShowC2Btn_Click(object sender, EventArgs e)
        {
            if (!GetAB(out int a, out int b))
            {
                MessageBox.Show("Incorrect values.");
                return;
            }

            var obj = new A(a, b);
            InfoListBox.Items.Add($"b++ = {obj.C2}");
        }

        private bool GetAB(out int a, out int b)
        {
            try
            {
                a = int.Parse(AValueTextBox.Text);
                b = int.Parse(BValueTextBox.Text);

                return true;
            }
            catch
            {
                a = b = 0;
                return false;
            }
        }
    }
}