VB学习第九周--计算π的近似值

Public Class Form1    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click        Dim n, t, s, m As Double        m = Val(TextBox1.Text)        s = 2.0#        For n = 1 To m            t = (2 * n) ^ 2 / ((2 * n - 1) * (2 * n + 1))            s *= t        Next        Label2.Text = "π的近似值为" & s    End Sub    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load    End SubEnd Class