VB程序代码(简单小程序)

实验一：（带有进度条的倒计时程序）Public Class Form1 Dim timers As Integer Dim temp As Integer Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick If (ProgressBar1.Value + ProgressBar1.Maximum / timers ProgressBar1.Maximum) Then ProgressBar1.Value += ProgressBar1.Maximum / timers Else Timer1.Enabled = False ProgressBar1.Value = ProgressBar1.Maximum MessageBox.Show(进度完成！) End If temp += 1 Label1.Text = temp.ToString() End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load timers = 30 End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click timers = Val(InputBox(输入, 请输入总时间。, 30, 0, 0) End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Timer1.Enabled = True End SubEnd Class实验二（定时器控制蝴蝶飞舞）Public Class Form1 Dim t As Integer Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick Dim t As Boolean If t = True Then PictureBox3.Image = PictureBox2.Image t = False Else PictureBox3.Image = PictureBox1.Image t = True End If Select Case t Case 0 PictureBox3.Image = PictureBox1.Image t = 1 Case 1 PictureBox3.Image = PictureBox2.Image t = 2 Case 2 PictureBox3.Image = PictureBox1.Image t = 3 Case 3 PictureBox3.Image = PictureBox1.Image t = 0 End Select End SubEnd Class实验三（递推法 迭代法-猴子吃桃）Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim n, y As Integer n = Val(TextBox1.Text) y = Val(TextBox2.Text) Dim xi As Double xi = y TextBox3.Text = 第 + n.ToString() + 天的桃子为： + y.ToString() + 个。 + vbCrLf For i As Integer = n - 1 To 1 Step -1 xi = (xi + 1) * 2 TextBox3.Text += 第 + i.ToString() + 天的桃子为： + xi.ToString() + 个。 + vbCrLf Next End SubEnd Class实验四（加减乘除随机数题）Public Class Form1 Dim x, y As Integer Dim i As Integer Dim sum As Integer Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If (Label1.Text ) Then TextBox2.Text += Label1.Text + TextBox1.Text TextBox2.Text += 结果 If (sum = Val(TextBox1.Text) Then TextBox2.Text += + vbCrLf Else TextBox2.Text += + vbCrLf End If End If Randomize() x = Int(Rnd() * 999 + 1) y = Int(Rnd() * 999 + 1) i = Int(Rnd() * 4 + 1) Select Case i Case 1 Label1.Text = x.ToString() + + y.ToString() + sum = x + y Case 2 Label1.Text = x.ToString() + + y.ToString() + sum = x - y Case 3 Label1.Text = x.T