[计算机软件及应用]VisualBasic快速入门.doc

Visual Basic快速入门什么是Sub 过程同用对话框 n = Text2 Text3 = gcd(m, n) End Sub 方法二： Private Sub Command2_Click() 最小公倍数 Dim m As Integer, n As Integer m = Text1 n = Text2 Text4 = m * n / (gcd(m, n) End Sub Private Sub Command3_Click() Text1.Text = Text2.Text = Text3.Text = Text4.Text = End Sub Private Sub Command4_Click() End End Sub Function gcd(m As Integer, n As Integer) 此过程并非递归，递归解法见课本P162 Dim k As Integer Do k = m Mod n m = n n = k Loop Until k = 0 gcd = m End Function 3 冒泡排序过程；书P107 Dim a(10) As Integer Private Sub sort(a() As Integer, n As Integer) Dim i As Integer, temp As Integer Dim switch As Boolean switch = True Do While switch switch = False n = n - 1 For i = 1 To n If a(i) a(i + 1) Then switch = True temp = a(i) a(i) = a(i + 1) a(i + 1) = temp End If Next i Loop End Sub Private Sub Command1_Click() Dim i As Integer For i = 1 To 10 a(i) = Int(90 * Rnd) + 10 Text1 = Text1 & a(i) & Next i End Sub Private Sub Command2_Click() Dim i As Integer Call sort(a, 10) For i = 1 To 10 Text2 = Text2 & a(i) & Next i End Sub 4 顺序查找过程；书P146 1顺序查找法（在一列数中查找某数x） 基本思想：一列数放在数组a(1)-a(n)中，待查找的数放在x 中，把x与a数组中的元素从头到尾一一进行比较查找。用变量p表示a数组元素下标，p初值为1，使x与a(p)比较，如果x不等于a(p)，则使p=p+1，不断重复这个过程；一旦x等于a(p)则退出循环；另外，如果p大于数组长度，循环也应该停止。（这个过程可由下语句实现） p = 1 Do While x a(p) And p =n p = p + 1 Loop 下面写一查找函数Find，若找到则返回下标值，找不到返回0 Option Base 1 Private Function Find( a( ) As Single,x As Single) As Integer Dim n%,p% n=Ubound( a ) p = 1 Do While p n And x a(p) p = p + 1 Loop If If p = n And a(p) x Then p = 0 Find=p End Function 方法二： Private Sub Command1_Click() Dim b(), k%, n% b = Array(1, 3, 5, 7, 9, 2, 4) k = Val(InputBox(输入要查找的关键值) Call search(b(), k, n) If n = 0 Then MsgBox (找到的位置为 & n) Else MsgBox (找不到) End Sub Sub search(a(), ByVal key%, ByRef index%) Dim i% For i = LBound(a) To UBound(a) If key = a(i) Then index = i Exit Sub End If Next i index = -1 End Sub 5 判断回文数过程；P140，4-4-3 Private Function huiwen(str As String) Dim i As Integer, l As Integer str = Text1 l = Len(str) For i = 1 To l / 2 If Mid(str, i, 1) Mid(str, l - i + 1, 1) Then Label1.Caption = str & 不是回文数 Else Label1.Caption = str & 是回文数 End If Next i End Function Private Sub Command1_Click() Dim x As String huiwen (x) End Sub 6 递归函数求阶乘；书P137 Private Sub Command1_Click() Dim n As Integer n = Val(InputBox(请输入n以求n的阶乘) Print n & ！=; fac(n) End Sub Public Function fac(n As Integer) As Integer If n = 1 Then fac = 1 Else fac = n * fac(n - 1) End If End Function 7 递归函数求Fibonacci数列；（求斐波拉契数列的第n项） Private Sub Command1_Click() Text2.Text = fab(Val(Text1.Text) 注意参数 End Sub Private Sub Command2_Click() Text1.Text = Text2.Text = Command1.SetFocus End Sub Private Sub Command3_Click() End End Sub Function fab(n As Integer) As Integer If n = 1 Or n = 2 Then 注意不能写成if n=1 or 2 fab = 1 Else fab = fab(n - 1) + fab(n - 2) 递归 End If End Function 8 矩阵靠边元素之和；P99 Option Explicit Private Sub Command1_Click() Dim n As Integer, i As Integer, j As Integer, all As Integer n = InputBox(请输入方阵的阶数：) ReDim a(n, n) As Integer Randomize For i = 1 To n For j = 1 To n a(i, j) = Int(90 * Rnd) + 10 Text1.Text = Text1.Text & a(i, j) & Next j Text1.Text = Text1.Text & vbCrLf Next i all = 0 For i = 1 To n all = all + a(1, i) all = all + a(i, 1) all = all + a(n, i) all = all + a(i, n) Next i Text2 = 所有靠边元素之和 + Str(all - a(1, 1) - a(1, n) - a(n, 1) - a(n, n) End Sub 9 矩阵不靠边元素之和； Option Explicit Private Sub Command1_Click() Dim n As Integer, i As Integer, j As Integer, all As Integer n = InputBox(请输入方阵的阶数：) ReDim a(n, n) As Integer Randomize For i = 1 To n For j = 1 To n a(i, j) = Int(90 * Rnd) + 10 Text1.Text =