D0081695 應數四乙 黃郁翔

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 WindowsFormsApplication2
{
public partial class Form1 : Form
{
int c, r;

public Form1()
{
InitializeComponent();
c = 0;
}

private void button4_Click(object sender, EventArgs e)
{
c = c + 1;
r = c % 3;

if (r == 0)
{
button1.BackColor = Color.Red;
button2.BackColor = Color.White;
button3.BackColor = Color.White;
}
else if (r == 1)
{
button1.BackColor = Color.White;
button2.BackColor = Color.Yellow;
button3.BackColor = Color.White;
}
else
{
button1.BackColor = Color.White;
button2.BackColor = Color.White;
button3.BackColor = Color.Blue;
}
}
private void timer1_Tick(object sender, EventArgs e)
{
c = c + 1;
r = c % 3;

if (r == 0)
{
button1.BackColor = Color.Red;
button2.BackColor = Color.White;
button3.BackColor = Color.White;
}
else if (r == 1)
{
button1.BackColor = Color.White;
button2.BackColor = Color.Yellow;
button3.BackColor = Color.White;
}
else
{
button1.BackColor = Color.White;
button2.BackColor = Color.White;
button3.BackColor = Color.Blue;
}
}
}
}