方法二：
Dim a%, m%, b%, c%, d% Private Sub Form_Click() a = Int(Rnd * 900 + 100) Print a
d = (a Mod 10) * 100
b = (a Mod 100) - (a Mod 10) c = a \\ 100 m = c + b + d Print m End Sub
16、从键盘输入任意长度的字符串，要求将字符顺序倒置，例如，将输入的“ABCDEFG”变换成“GFEDCBA”。 Private Sub Form_Click() Dim i, a, b, n As String
n = InputBox(\输入字符\i = Len(n)
For a = 1 Toi / 2 b = Mid(n, a, 1)
Mid(n, a, 1) = Mid(n, i + 1 - a, 1) Mid(n, i + 1 - a, 1) = b Next a Print n End Sub
17、利用随机函数生成一个4×4的矩阵(即二维矩阵),范围是[20,50]内的整数,输出该矩阵所有数据之和
Private Sub Form_Click() Dim a(3, 3), sum% For i = 0 To 3 For j = 0 To 3
a(i, j) = Int(Rnd * 31 + 20) Next j Next i
For i = 0 To 3 For j = 0 To 3 Print a(i, j); Next j Print Next i
For i = 0 To 3 For j = 0 To 3 sum = sum + a(i, j)
Next j Next i
Print \End Sub
18.编一子过程Procmin(a(),amin)，求一维数组中a的最小值amin.
（随机产生10个200-400之间的数，并显示数组各元素；调用子函数，显示最小值） Private Sub Form_Click() Dim a(1 To 10), amin, i% For i = 1 To 10
a(i) = Int(Rnd * 200 + 200) Print a(i); Next i
Call s(a(), amin) Print
Print \End Sub
Sub s(b(), min) Dim i%
min = b(LBound(b))
For i = LBound(b) + 1 To UBound(b) If b(i) < min Then min = b(i) Next i End Sub
19，20.编一个选择排序法子过程，对已知的若干整数按递增次序排列。 提示：子过程的形式为sub sort1(a%())。 Private Sub Command1_Click() Dim b%(10), i% Print \排序前\For i = 1 To 10
b(i) = Int(Rnd * 100) Print b(i); Next i Print
Print \排序后\Call sort(b()) End Sub
Sub sort(a%())
Dim i%, m%, n%, min%, t% n = UBound(a) For i = 0 To n - 1 min = i
For j = i + 1 To n
If a(j) < a(min) Then min = j Next j
m = a(i): a(i) = a(min): a(min) = m Next i
For i = LBound(a) To UBound(a) Print a(i); Next i End Sub
递减次序排列
Private Sub Command1_Click() Dim b%(10), i%
Print \排序前\For i = 0 To 9
b(i) = Int(Rnd * 100) Print b(i); Next i Print
Print \排序后\Call sort(b()) End Sub
Sub sort(a%())
Dim i%, m%, n%, min%, j% n = UBound(a) For i = 0 To n - 1 For j = 0 To n - 1 - i
If a(j) < a(j + 1) Then m = a(j): a(j) = a(j + 1): a(j + 1) = m Next j Next i
For i = LBound(a) To UBound(a) - 1 Print a(i); Next i End Sub
21,22.已知有序数组a()，编程插入x（x的值为14）。数组a中的元素分别 为{12，6，4，89，75，63，100，20，31}。
Ip = Val(InputBox(\请输入数字x\For i = 0 To UBound(A) If Ip ReDim Preserve A(UBound(A) + 1) t = A(i) A(i) = Ip ins = i Exit For End If Next i For i = ins + 1 To UBound(A) - 1 n = A(i) A(i) = t t = n Next i Text2.Text = \ For i = 0 To UBound(A) - 1 Text2.Text = Text2.Text & \ Next i End Sub Private Sub Form_Load() ReDimA(9) A(0) = 4: A(1) = 6: A(2) = 12: A(3) = 20 A(4) = 31: A(5) = 63: A(6) = 75: A(7) = 89 A(8) = 100 End Sub 23、声明一个整型的二维数组a(1 to 4,1 to 4)，用随机函数产生各元素，范围介于[1,20]之间，编程将第2行和第4行对应元素交换。 Private Sub Form_Click() Dim a(0 To 3, 0 To 3), i%, j%, t For i = 0 To 3 For j = 0 To 3 a(i, j) = Int(Rnd * 21 + 1) Print Tab(j * 5); a(i, j); Next j Next i Print Print For j = 0 To 3 t = a(1, j): a(1, j) = a(3, j): a(3, j) = t Next j For i = 0 To 3 For j = 0 To 3 Print Tab(j * 5); a(i, j); Next j Next i End Sub 24、定义三个4×4的二维数组A,B,C，A和B中的元素均随机生成，数组A的范围是1～20，数组B的范围是100～200，数组C是A和B相加得到的。请编程生成并输出A,B,C。 Private Sub Command1_Click() Dim a(3, 3), b(3, 3), c(3, 3), t%, m% For i = 0 To 3 For j = 0 To 3 a(i, j) = Int(Rnd * 20 + 1) Picture1.Print a(i, j); Next j Next i Picture1.Print For i = 0 To 3 For j = 0 To 3 b(i, j) = Int(Rnd * 101 + 100) Picture1.Print b(i, j); Next j Next i Picture1.Print For i = 0 To 3 For j = 0 To 3 c(i, j) = a(i, j) + b(i, j) Picture1.Print c(i, j); Next j Next i 25、随机产生10个1~100的正整数放入数组，显示产生的数，求最大值、最小值、平均值。 Private Sub Form_Click() Dim a(1 To 10) As Integer, i%, maxa%, mina%, suma% For i = 1 To 10 a(i) = Int(Rnd * 71 + 30) Next i mina = a(1) maxa = a(1) suma = a(1) For i = 2 To 10 If a(i) >maxa Then maxa = a(i) If a(i) < mina Then mina = a(i) suma = suma + a(i) Next i For i = 1 To 10 Print a(i);