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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        class cmath
        {
            public int tambah (int a, int b)
            { return a + b;
            }
            public int kurang ( int a , int b )
            {
                return a - b;

            }
        }
        class cmath2 : cmath
        {
            public int kali ( int a, int b )
            {
                return a * b;
            }
            public int bagi ( int a , int b )
            {
                return a / b;
            }
        }
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            cmath vcmath = new cmath();
            int vhasil;
            vhasil = vcmath.tambah(1, 2);
            MessageBox.Show(vhasil.ToString());

        }

        private void button2_Click(object sender, EventArgs e)
        {
            cmath2 vcmath2 = new cmath2();
            int vhasil;
            vhasil = vcmath2.tambah(1, 2);
            MessageBox.Show(vhasil.ToString());
        }
    }
}