阅读程序，写出执行结果。---- 第五章 选择分支与循环 答案 新编Visual Basic程序设计教程 陈斌 著

阅读程序，写出执行结果。---- 第五章 选择分支与循环 答案 新编Visual Basic程序设计教程 陈斌 著

1． 阅读程序，写出执行结果。
(1)：-------------------------------------------------------------------------------
Private Sub Form_Click()
    Dim a As Integer, b As Integer
    a = 1: b = 0
    Do While a <= 5
        b = b + a * a
        a = a + 1
    Loop
    Print a, b
End Sub

运行结果为：  6   55  

(2)：-------------------------------------------------------------------------------
Private Sub Form_Click()
    Dim ch As String, i As Integer
    ch = "DEF"
    For i = 1 To Len(ch)
        ch = Mid(ch, 2 * i - 1, 1) & Left(ch, Len(ch))
        Print ch
    Next i
End Sub

运行结果为：
DDEF
EDDEF
FEDDEF
 
(3)：---------------------------------------------------------------------------------
Private Sub Form_Click()
    Dim p As Integer, i As Integer
    p = 1
    For i = 1 To 5
        p = p + (2 * i - 1) / (2 * i + 1)
        If p >= 20 Then Exit For
    Next i
    Print i, p
End Sub

运行结果为：  6     5

(4)：---------------------------------------------------------------------------------
Private Sub Form_Click()
    Dim p As Integer, i As Integer, n As Integer
    p = 2: n = 20
    For i = 1 To n Step p
        p = p + 2
        n = n - 3
        i = i + 1
        If p >= 10 Then Exit For
    Next i
    Print i, p, n
End Sub

运行结果为：  11    10    8

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