第四章习题答案.ppt

1、第四章部分练习题答案：,4、（1） 2 3 2 （2） 124 出错 3123 （3） xyz12310k 123 10k ( 4) xyz12310k 出错 10k 6、 “请输入你的年龄:” “输入提示” “20” 7、 C 13、D 16、A 17、 A,15、 S=val(text1) Do a=s mod 10 b=b*10+a s=s10 Loop until s=0 Print b,15、 x=len(text1) For i=1 to x n=mid(text1,i,1) s=s+n*10(i-1) Next i Print s,20、 (1) 3次 a=6561 b=100

2、(2) 将a*b=500 改为 a*b500 3次 a=3 b=175 (3) 2次 a=3 b=0 (4) 5次 a=32 b=0 21、(1) 155 (2) AABC BAABC CBAABC (3) *%*% (4) a=16 （5）求最大公约数和最小公倍数 (6) 转换为2进制 22、Sum=14 / Sum=10,Private Sub Command1_Click() Dim n As Integer, sum As Long, s As Long Dim i As Integer, j As Integer n = Val(Text1) For i = 1 To n s = 0

3、 For j = 1 To i s = s + j Next j sum = sum + s Next i Text2 = sum End Sub,23题,For i = 1 To n For j = 1 To i sum = sum + j Next j Next i,For j = 1 To n s = s + j sum = sum + s Next j,For j = 1 To n s = j * (n - j + 1) sum = sum + s Next j,For j = 1 To n sum = sum + j * (j + 1) / 2 Next j,Private Sub

4、Command1_Click() n = 0 Sum = 1 Do n = n + 1 Sum = Sum * n n Print sum=; Sum If Sum 400000 Then Exit Do Loop Print n - 1 End Sub,24题,Private Sub Command1_Click() Dim n As Integer, s As Long s = 1 Do n = n + 1 s = s + 2 n Loop Until s 10000 Print n - 1 End Sub,25题,Dim str As String n = InputBox(ffff)

5、a = 1： b = 2 str = “2/1“ : Sum=2/1 For i = 2 To n t = a ： a = b ： b = a + t Print b; /; a Sum = Sum + b / a str = str Spc(5); b End If Next a,28题,Private Sub Command1_Click() Dim i As Integer, s As Integer Dim j As Integer, n As Integer, p As Boolean For i = 499 To 1 Step -2 p = True For j = 2 To Sqr(i) If i Mod j = 0 Then p = False ：Exit For End If Next j If p Then n = n + 1：Print i; If n = 10 Then Exit For End If Next i End Sub,30题,31、(1)(2*x0+a/(x02)/3 abs(x1-x0)10e-6 (2)t=0 t=t+a*10(j-1) (3) l=len(s1) s=s+mid(s1,n,1)