2012年计算机考试二级VB考点及习题(8)

全国等级考试资料网 2019-01-18 11:18:43 78

2012年计算机考试二级VB考点及习题(8)

(2)static变量

Private Sub Command1_Click()

Dim n As Integer, i As Integer

n = 2

For i = 9 To 1 Step -1

Call sub2(i, n)

Print i, n

Next i

End Sub

Private Sub sub2(x As Integer, y As Integer)

Static n As Integer

Dim i As Integer

For i = 3 To 1 Step -1

n = n + x

x = x - 1

Next i

y = y + n

End Sub

(3) 递归

Private Sub Command1_Click()

Dim a As Integer

a = 2

Call sub1(a)

End Sub

Private Sub sub1(x As Integer)

x = x * 2 + 1

If x < 10 Then

Call sub1(x)

End If

x = x * 2 + 1

Print x

End Sub

(4)递归

Private Sub test(x As Integer)

Dim i As Integer

If x <> 0 Then

Call test(x - 1)

For i = 1 To x

Print x;

Next i

Print

End If

End Sub

Private Sub Form_Click()

test 3

End Sub

(5)同名变量

Dim y As Integer

Private Sub Form_Click()

Dim x As Integer,y as integer

x=1 : y=1

Print "x1=";x, "y1=";y

Test

Print "x4=";x, "y4=";y

End Sub

Private Sub Test()

Dim x As Integer

Print "x2=";x, "y2=";y

x=2 : y=3

Print "x3=";x,"y3=";y

End Sub

特例:

1、运行程序在窗体显示的结果是:

Private Sub Form_Click()

Dim a As Integer, b As Integer

a = 3: b = 4

Call sub1(a, a)

Print a, b

Call sub1(b, b)

Print a, b

End Sub

Private Sub sub1(x As Integer, y As Integer)

x = x + 2

y = x + y

End Sub

相关资料

相关阅读