C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace form11
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Close();

        }

        private void button1_Click(object sender, EventArgs e)
        {
          
          
                //Console.WriteLine("输入两个数：");
                int Q, R,i;
                Q = int.Parse(textBox1.Text);
                R = int.Parse(textBox2.Text);
       
              
            if(Q!=R)
            {

                for (i = 0; Q != R;i++ )
                    if (Q > R)
                    {
                        Q = Q - R;
                    }
                    else
                    {
                        R = R - Q;
                    }

                label1.Text = ((int.Parse(textBox1.Text)) + "和" + (int.Parse(textBox2.Text)) + "的最大公倍数是：" + Q);
            }
            else
            {
                label1.Text = ((int.Parse(textBox1.Text)) + "和"+(int.Parse(textBox2.Text)) + "的最大公倍数是：" + Q);
            }
               
            }
          
        }
    }