Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim sum As Integer sum = 0 Dim i As Integer For i = 100 To 300 ' 如果能被3整除且被7整除,则累加 If 0 = i Mod 3 And 0 = i Mod 7 Then sum = sum + i End If Next i MsgBox(sum) End Su