VB_编程练习(答案).doc

一.选择结构-题目：编写函数fun，函数的功能是：根据一个百分制 成绩mark（整数），显示对应五级制的评定。条件如下： mark大于等于90显示优秀 mark小于90且大于等于80显示良好 mark小于80且大于等于70显示中等 mark小于70且大于等于60显示及格 mark小于60显示不及格 要求使用IF语句来实现。-Private Function fun(mark As Integer) As String*Program*If mark = 90 Then fun = 优秀ElseIf mark = 80 Then fun = 良好ElseIf mark = 70 Then fun = 中等ElseIf mark = 60 Then fun = 及格Else fun = 不及格End If* End *End FunctionPrivate Sub Form_Load() Show Print fun(90)End Sub-题目：编写函数fun，函数的功能是：判断一个字符是: 字母字符、数字字符还是其他字符，并做相应的显示。 字母字符显示字符串字母 数字字符显示字符串数字 其他字符显示字符串其他 要求使用select语句来实现-Private Function fun(n As String) As String*Program*Select Case nCase A To Z, a To z fun = 字母Case 0 To 9 fun = 数字Case Else fun = 其他End Select* End *End FunctionPrivate Sub Form_Load() Show Print fun(A) Print fun(9) Print fun(&)End Sub二.一般循环-题目：(事件)双击窗体。 (响应)求出100200之间，能被5整除，但不能被3整除的数。输出这些数并求所有数之和，存入变量中SUM中。 输出sum 应为 2100-Private Sub Form_dblClick()Dim sum As Integersum = 0* Program *Dim i As IntegerFor i = 100 To 200 If (i Mod 5) = 0) And (i Mod 3) 0) Then Print (CStr(i) sum = sum + i End IfNext* End *Print sumEnd Sub-题目：(事件)单击窗体。 输出L 应为 46189 (响应)求1020之间所有素数的乘积并输出在窗体上。将结果存入变量L中。-Private Sub Form_Click()Dim l As Long* Program * Dim i As Integer Dim j As Integer Dim b As Boolean l = 1 b = False For i = 10 To 20 For j = 2 To i - 2 If i Mod j = 0 Then b = True End If Next If b = False Then l = l * i End If b = False Next Print Str(l)* End *End Sub-题目：(事件)单击窗体。 (响应)编写程序求101112+111213+151617的结果， 并将结果输出到窗体上。将结果存入变量M中 输出M 应为 15390-Private Sub Form_Click()Dim m As Long* Program *Dim i, j As IntegerDim s As LongFor i = 10 To 15 s = 1 For j = i To i + 2 s = s * j Next m = m + sNextPrint (CStr(m)* End *End Sub-题目：(事件)单击窗体。 (响应)在窗体上打印数列2/1,3/2,5/3,8/5,13/8 的前10项，并求其和， 将和保存在变量s中 输出：-Private Sub Form_Click()Dim s As Single* Program *Dim i, j, k, m As Integers = 0i = 2j = 1For k = 1 To 10 s = s + i / j m = j Print (CStr(i) & / & CStr(j) j = i i = i + mNext* End *End Sub-题目：编写函数fun其功能是：根据整型形参m，计算如下公式的值: y=11/31/51/7.1/(2m+1) 例如：若m=9，则应输出：2.133255-Private Function fun(m As Integer) As Single Dim y As Double* Program * Dim y As Double Dim i As Integer y = 1 For i = 1 To m y = y + 1 / (2 * i + 1) Next fun = y* End *End FunctionPrivate Sub Form_Load() Show Print fun(9)End Sub-题目：函数fun其功能是：根据整型形参m，计算如下公式的值：y=1/21/41/6.1/2m 例如：若m=9，则应输出：1.41448412698413-Private Function fun(m As Integer) As Double* Program * Dim y As Double Dim i As Integer For i = 1 To m y = y + 1 / (2 * i) Next fun = y* End *End FunctionPrivate Sub Form_Load() Show Print fun(9)End Sub-题目： (事件)单击窗体。 (响应)已知sum=1-1/4+1/9-1/16+1/25.-1/100, 输出 sum 应为 0.8179622 请将sum结果值输出到窗体上。 使用for.next语句完成程序-Private Sub Form_Click() Dim sum As Single* Program *Dim i As Integerfor i = 1 to 10sum = sum + (-1) (i - 1) /(i*i)nextPrint sum * End *End Sub三.级数-题目： (事件)单击窗体。 (响应)已知sum=1/2!-1/4!+1/6!-1/8!+1/10!,请将sum结果值输出到窗体上。 使用do while.loop语句完成程序 输出sum 应为 0.4596977-Private Sub Form_Click() Dim p As Long p变量存放阶乘的值 Dim sum As Single* Program *Dim i As IntegerDim n As Integeri = 1p = 1Do While i = 10 p = p * iIf i Mod 2 = 0 Then n = n + 1 sum = sum + (-1) (n - 1) / pEnd If i = i + 1LoopPrint sum* End *End Sub-题目：(事件)单击窗体。 (响应)已知S=1+1/4+1/9+1/16+1/25+1/100，结果输出在窗体上。输出s 应为 1.291286-Private Sub Form_Click()Dim s As Single* Program *Dim i As Integers = 0For i = 1 To 10 s = s + 1 / (i i)NextPrint (s)* End *End Sub-题目： (事件)单击窗体。 (响应)求sum=1+1+2+3+5+8+13+.+144的和,请将sum结果值输出到窗体上。使用 do.loop语句完成程序 输出sum 应为 376-Private Sub Form_Click() Dim sum As Long* Program *Dim i As IntegerDim s1 As IntegerDim s2 As Integeri = 1s1 = 1: s2 = 1Sum = Sum + s1 + s2Do If s2 = 144 Then Exit Do End If s1 = s1 + s2 s2 = s1 + s2 Sum = Sum + s1 + s2 LoopPrint Sum* End *End Sub-题目：编写函数fun其功能是：根据整型形参m，计算如下公式的值: y=1/5+1/6+1/7+1/8+1/9+1/10.+1/(m+5) 例如：若m=9，则应输出：1.168229要求：函数中用到的中间变量必须声明为Single类型。-Private Function Fun(m As Integer) As Single* Program * Dim y As Double Dim i As Integer For i = 0 To m y = y + 1 / (i + 5) Next Fun = y* End *End FunctionPrivate Sub Form_Load() Show Print Fun(9)End Sub四.数字关系-题目：编写函数fun其功能是: 判断一个整数w的各位数字平方之和能否被5整除 , 可以被5整除则返回1 , 否则返回0-Private Function fun(w As Integer) As Boolean* Program * Dim k As Integer, s As Integer Do s = s + (w Mod 10) * (w Mod 10) w = Int(w / 10) Loop While w 0 If s Mod 5 = 0 Then k = 1 Else k = 0 End If fun = k* End *End FunctionPrivate Sub Form_Load() Show Print fun(50) 输出True Print fun(51) 输出FalseEnd Sub-题目：(事件)双击窗体。 (响应)写程序解决百钱买百鸡问题：公鸡3元1只，母鸡5元1只，小鸡一元3只，怎样用100元买100只鸡。把结果输出到窗体上。将答案数存放在变量N中。 输出- Private Sub Form_dblClick()Dim n As Integern = 0* Program *Dim i, j, k As IntegerFor i = 1 To 20 母鸡 For j = 1 To 33 公鸡 For k = 3 To 100 小鸡 If (k Mod 3) = 0) And (i * 5 + j * 3 + k / 3) = 100) And (i + j + k) = 100) Then Print (CStr(i) Print (CStr(j) Print (CStr(k) n = n + 1 End If Next NextNext* End *End Sub-题目： (事件)单击窗体。 (响应)输出所有的三位数，它满足该数中有某两位为相同的数， 且该数是一个完全平方数。 求出所有这些数的和，并将结果存入变量SUM中。 输出-Private Sub Form_Click() Dim sum As Integer* Program *dim a as integer,b as integerdim b3 as integer,b2 as integer,b1 as integerfor a=10 to 31b=a*ab3=b100b2=(b10) mod 10b1=b mod 10if b1=b2 or b1=b3 or b2=b3 then? a,bsum=sum+bend ifnext aPrint sum* End *End Sub-题目：(事件)单击窗体。 (响应)求出1000-9999之间具有如下特点的四位数字， 它的平方根恰好就是它中间的两位数字，例如，2500开平方为50，恰为2500的中间两位， 输出 找出所有这样的四位数。并求出所有这样的数的和存入SUM中-Private Sub Form_Click()Dim sum As Integersum = 0* Program *Dim i As Integer Dim j As Integer For i = 1000 To 9999 j = Val(Mid(Trim(Str(i), 2, 2) If j 2 = i Then Print i, sum = sum + i End If Next* End *End Sub-题目： (事件)单击窗体。 (响应)求一个数,它除3余2，除5余3，除7余2， 请将满足上面条件的最小数保存到sum变量中。 输出 sum 应为23 使用for.next语句完成程序-Private Sub Form_Click() Dim sum As Integer* Program *Dim i As IntegerFor i = 2 To 1000 If i Mod 3 = 2 And i Mod 5 = 3 And i Mod 7 = 2 Then Print i Exit For End IfNext isum = i* End *End Sub五.递推-题目：编写函数fun，函数的功能是：当x的初值为10，每年增长率为百分之一，计算多少年以后x的值能达到y，并显示所需年数的值（变量名必须为n）。 要求使用Do . Loop Until语句来实现。 当y为15时， n应该为41-Private Function fun(y As Single) As LongDim x As Single, n As Long*Program*x = 10n = 0Do While x y x = x * 1.008 n = n + 1Loopfun = n* End *End FunctionPrivate Sub Form_Load() Show Print fun(15)End Sub-题目：已知，猴子吃一堆桃子，每天吃桃子总数的一半多一个。到第n天时，桃子只剩一个。编写函数fun，函数的功能是: 求出开始桃子的数量并显示。如： n为7时，则显示190要求使用For语句来实现。 要求使用Do Until . Loop语句来实现-Private Function fun(n As Long) As String*Program*x = 1i = 1Do Until i = n x = (x + 1) * 2 i = i + 1Loopfun = x* End *End FunctionPrivate Sub Form_Load() Show Print fun(7)End Sub-题目：用迭代法求某个数的平方根。 已知求平方根的迭代公式如图：算法思想：对于一个问题的求解x，可由给定的一个初值x0，根据某一 迭代公式得到一个新的值x1，这个新值x1比初值x0更接近要求的值x； 再以新值作为初值，即：x1x0,重新按原来的方法求x1,重复这一过和 直到|x1-x0| 0.00001 Fsqrt = x1* End *End FunctionPrivate Sub Form_Load() Show Print Fsqrt(45) 当a为45 时应输出6.708204End Sub六.数组-题目：求二维数组中最大元素及其所在的行和列并将最大值存入变量Max中，将最大值的行位置存入row中，列位置存入变量column中. 输出：-Private Sub Form_Load() Show Dim a(2, 3) As Integer Dim max As Integer, row As Integer, column As Integer a(1, 1) = 34: a(1, 2) = 34: a(1, 3) = 43: a(2, 1) = 34: a(2, 2) = 78: a(2, 3) = 12* Program * Dim i As Integer, j As Integer max = a(1, 1): row = 1: column = 1 For i = 1 To 2 For j = 1 To 3 If a(i, j) a(row, column) Then max = a(i, j) : row = I : column = j End If Next j Next i Print 最大元素是; max Print 在第 & row & 行,; 第 & column & 列* End *End Sub-题目：应用选择法对数组A按升序排列基本思想: 1）对有n个数的序列（存放在数组a(n)中），从中选出最小的数，与第1个数交换位置； 2）除第1 个数外，其余n-1个数中选最小的数，与第2个数交换位置； 3）依次类推，选择了n-1次后，这个数列已按升序排列。 输出排序前后数组数据，验证结果-Private Sub Sort(ByRef a() As Integer, n As Integer)* Program * Dim i, j, imin, temp As Integer For i = 1 To n - 1 imin = i For j = i + 1 To n If a(imin) a(j) Then imin = j Next j temp = a(i) a(i) = a(imin) a(imin) = temp Next i* End *End SubPrivate Sub Form_Load() Show Dim i As Integer Dim arr(10) As Integer Randomize Print 排序前:For i = 1 To 10 arr(i) = Int(10 * Rnd + 1) : Print arr(i); Next Print Sort arr, 10 Print 排序后: For i = 1 To 10 Print arr(i); NextEnd Sub-题目：(事件)单击窗体。 (响应)生成一个一维数组(10个数组元素依此为：15、23、72、43、96、23、3、65、88、17)， 写程序求出这个数组中的最大值、最小值和平均值，并输出在窗体上。 将最大值，最小值，平均值分别存入变量Max,Min,Aver中 输出Max为96，Min为3，Aver为44-Private Sub Form_Click()Dim max, min, aver As Integer* Program *Dim a()Dim i, s As Integera = Array(15, 23, 72, 43, 96, 23, 3, 65, 88, 17)max = a(0)min = a(0)s = 0For i = 0 To 9 If a(i) max Then max = a(i) End If If a(i) min Then min = a(i) End Ifs = s + a(i)Nextaver = Int(s / 10)Print max, min, aver* End *End Sub七.杂项-题目：对字符串进行加密处理。 加密过程: 将每个字母C减一序数K5，即 c=chr(Asc(c)- k),这时 ZU， zu，YT 当加序数后的字母小于A或a则 c=Chr(Asc(c)-k +26) 输出：-Private Function EnyStr(strI As String) As String* Program * Dim i As Integer Dim strp As String, strT As String, iA As String Dim nl As String i = 1: strp = nl = Len(RTrim(strI) Do While (i = A And strT Asc(Z) Then iA = iA - 26 strp = strp + Chr$(iA) ElseIf (strT = a And strT Asc(z) Then iA = iA - 26 strp = strp + Chr$(iA) Else strp = strp + strT End If i = i + 1 Loop EnyStr = strp* End *End FunctionPrivate Sub Form_Load() Show Print EnyStr(abc def xyz)End Sub-题目：编写函数fun，函数的功能是：计算两个正整数的最大公约数，并显示。如：两个数为15、20，结果显示5 要求使用Do . Loop语句来实现。-Private Function fun(m As Integer, n As Integer) As IntegerDim r%If m n Then r = m: m = n: n = r*Program*Do r = m Mod n If r = 0 Then Exit Do m = n n = rLoopfun = n* End *End FunctionPrivate Sub Form_Load() Show Print fun(15, 10)End Sub-题目：(事件)单击窗体。 (响应)一球从100米高度自由落下，每次落地返回原高度的一半，求第10次落地时，共经过多少米？并将结果在窗体上输出。 输出s应为299.6094-Private Sub Form_Click()Dim s As Single* Program *Dim j, i As Integers = 0j = 100For i = 2 To 10 j = j / 2 s = s + 2 * jNexts = 100 + sPrint s* End *End Sub-题目：编写函数fun，函数的功能是：计算并输出给定整数n的所有因子之和（不包括1与自身）。规定n的值不大于1000? 例如：n的值为855时，应输出704。-Private