VB程序设计教程第3版课后答案解析.docx
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VB程序设计教程第3版课后答案解析
A.1
PrivateSubCommand1_Click（
Label3=Text1
EndSub
A.2
PrivateSubForm_Load（
Timer1.Interval=0
EndSub
PrivateSubCommand1_Click（'自动
Timer1.Interval=200
EndSub
PrivateSubCommand2_Click（'手动
Timer1.Interval=0
CallMyMove
EndSub
PrivateSubTimer1_Timer（
CallMyMove
EndSub
SubMyMove（
Label1.MoveLabel1.Left-50
IfLabel1.Left<0ThenLabel1.Left=Form1.WidthEndSub
A.3
PrivateSubForm_Click（
Text1=Val（Text1+1
EndSub
PrivateSubForm_Load（
Text1=0
EndSub
A.4
PrivateSubForm_Click（
Caption="单击窗体,改变图片"
Picture=LoadPicture（App.Path+"\n_015.bmp"
Print"欢迎使用VB"
EndSub
PrivateSubForm_DblClick（
Cls
Caption="双击窗体,卸去图片"
Picture=LoadPicture（""'
EndSub
PrivateSubForm_Load（
Caption="装入窗体"
Picture=LoadPicture（App.Path+"\n_016.bmp"
Print"装入图"
EndSub
PrivateSubForm_Resize（'该事件的作用窗体始终与图一样大
'Caption="窗体大小不变"
'Form1.Width=260*16'260是Tongji-2.bmp图的宽度,象素单位
'Form1.Height=260*16+200'260是图的高度,象素单位,200是窗体的标题栏高度EndSub
A.5
SubCommand1_Click（
Text1.FontName="隶书"
Text1.FontSize=25
EndSub
SubCommand2_Click（
Text2.Text=Text1.SelText
Text2.FontName=Text1.FontName
Text2.FontSize=Text1.FontSize
EndSub
B.1
PrivateSubCommand1_Click（
Text2=Format（5/9*（Val（Text1-32,"0.00"
EndSub
PrivateSubCommand2_Click（
Text1=Format（9/5*Val（Text2+32,"0.00"
EndSub
或
PrivateSubCommand1_Click（
Dimf!
c!
'声明两个变量
f=Val（Text1
c=5/9*（f-32
Text2=Format（c,"0.00"'保留两位小数
EndSub
PrivateSubCommand2_Click（
Dimff!
cc!
'声明两个变量
cc=Val（Text2
ff=9/5*cc+32
Text1=Format（ff,"0.00"'保留两位小数
EndSub
B.2
Label2=Format（Val（Text1*Val（Text1*3.14,"0.00"EndSub
PrivateSubCommand2_Click（
Label3=Format（Val（Text1*3.14*2,"0.00"
EndSub
PrivateSubText1_LostFocus（
IfNotIsNumeric（Text1.TextThen
MsgBox"输入有非数字字符,请重新输入",,"警告"
Text1.Text=""
Text1.SetFocus
EndIf
EndSub
或
PrivateSubCommand1_Click（
Label2=Format（Val（Text1*Val（Text1*3.14,"0.00"EndSub
PrivateSubCommand2_Click（
Label3=Format（Val（Text1*3.14*2,"0.00"
EndSub
PrivateSubText1_KeyPress（KeyAsciiAsInteger
IfKeyAscii=13Then
IfNotIsNumeric（Text1.TextThen
Text1.Text=""
EndIf
EndIf
EndSub
B.3
PrivateSubCommand1_Click（
n=Int（Log（2/Log（1.008+1
Label1=n&"年后人数超过26亿"
EndSub
B.4
PrivateSubCommand1_Click（
Dimx,dx,cd
x=Text1.Text
dx=UCase（x
cd=Len（x
Print"大写字母为:
";dx
Print"字符串长度为:
";cd
EndSub
B.5
Text1=Int（Rnd*900+100
EndSub
PrivateSubCommand2_Click（
Dimx%,x1%,x2%,x3%
x=Val（Text1
x1=xMod10'分离出的个位数
x2=（xMod100\10'分离出的十位数
x3=x\100'分离出的百位数
Label1=x1*100+x2*10+x3
EndSub
B.6
PrivateSubForm_Click（
Label1=Left（Text1,11
Label2=Mid（Text1,12,6
Label3=Right（Text1,5
EndSub
B.7
PrivateSubCommand1_Click（
Print
Fori=1To5
PrintTab（15-i*2;String（2*i-1,"★";Spc（18-4*（i-1;String（2*i-1,"★"
Nexti
EndSub
PrivateSubCommand2_Click（
Cls
EndSub
进一步要求:
PrivateSubCommand1_Click（
Print
Fori=1To5
PrintTab（15-i*2;String（2*i-1,"★";String（10-（2*i-1,"☆";String（2*i-1,"★"
Nexti
EndSub
PrivateSubCommand2_Click（
Cls
EndSub
B.8
PrivateSubForm_Click（
x=Val（InputBox（"输入一正实数","计算",0
pf=Format（x*x,"0.000"
pfg=Format（Sqr（x,"0.000"
lf=Format（x*x*x,"0.000"
lfg=Format（x^（1/3,"0.000"
Print"平方为:
";pf;Space（5;"平方根为:
";pfg;Space（5;"立方为:
";lf;Space（5;"立方根为:
";lfg
EndSub
C.1
PrivateSubForm_Click（
Dimx!
y!
x=Val（InputBox（"输入x的值"
Ifx<1000Then
y=x
ElseIfx<2000Then
y=0.9*x
ElseIfx<3000Then
y=0.8*x
Else
y=0.7*x
EndIf
Printy
EndSub
C.2
PrivateSubForm_Click（
Dimx!
y!
x=Val（InputBox（"输入上网时间"
Ifx<10Then
y=30
ElseIfx<50Then
y=30+2.5*（x-10
Else
y=30+2.5*40+2*（x-50
EndIf
Ify>150Then
y=150
EndIf
Printy
EndSub
C.3
PrivateSubCommand1_Click（
Dimx!
y!
z!
x=InputBox（"inputx"
y=InputBox（"inputy"
z=InputBox（"inputz"
Print"xyz"
Print"排序前";x;"";y;"";z
Ifxx=y:
y=t
Ifxx=z:
z=t
Ifyy=z:
z=t
Print"排序后"&x&""&y&""&zEndSub
PrivateSubCommand2_Click（
Dimx!
y!
z!
x=InputBox（"inputx"
y=InputBox（"inputy"
z=InputBox（"inputz"
Print"xyz"
Print"排序前";x;"";y;"";z
Ifxx=y:
y=t
Ifyt=y:
y=z:
z=t
Ifxt=x:
x=y:
y=t
EndIf
EndIf
Print"排序后"&x&""&y&""&zEndSub
C.4
Dima（3AsInteger
PrivateSubCommand1_Click（
Picture1.Cls
Fori=0To2
a（i=Int（Rnd*100+200
Picture1.Printa（i
Nexti
EndSub
PrivateSubCommand2_Click（
Picture2.Cls
DimzAsInteger
Fori=0To1
Ifa（i>a（i+1Then
z=a（i+1
a（i+1=a（i
a（i=z
Nexti
Picture2.Printa（0
Picture2.Printa（1
Picture2.Printa（2
EndSub
C.5
PrivateSubText2_LostFocus（
Dimm%,n%,y%
m=Val（Text1
n=Val（Text2
IfnMod2<>0Then
MsgBox（"脚数必定为偶数"
Text2=""
Text2.SetFocus
Else
y=n/2-m
Ify<0Then
MsgBox（"脚数必须≥2倍的头数,请重新输入"
Text2=""
Text2.SetFocus
Else
x=n/2-m
Label2=y
Label3=m-y
EndIf
EndIf
EndSub
C.6
PrivateSubCommand1_Click（
Dima!
b!
c!
x1!
x2!
de!
a=Text1
b=Text2
c=Text3
de=b*b-4*a*c
t=2*a
Ifde=0Then
Text4=Format（-b/t,"0.00"
Text5=Format（-b/t,"0.00"
ElseIfde>0Then
Text4=Format（（-b+Sqr（de/t,"0.00"
Text5=Format（（-b-Sqr（de/t,"0.00"
Text4=Format（-b/t,"0.00"&"+"&Format（Sqr（Abs（de/t,"0.00"&"i"Text5=Format（-b/t,"0.00"&"-"&Format（Sqr（Abs（de/t,"0.00"&"i"EndIf
EndSub
PrivateSubCommand2_Click（
Text1=""
Text2=""
Text3=""
Text4=""
Text5=""
EndSub
C.7
PrivateSubText3_LostFocus（
SelectCaseTrim（Text3
Case"+"
Text4=Val（Text1+Val（Text2
Case"-"
Text4=Val（Text1-Val（Text2
Case"*"
Text4=Val（Text1*Val（Text2
Case"/"
IfVal（Text2=0Then
MsgBox"分母为零,重新输入"
Text2=""
Text2.SetFocus
Else
Text4=Val（Text1/Val（Text2
EndIf
EndSelect
EndSub
C.8
PrivateSubText1_LostFocus（
SelectCaseTrim（Text1
Case1
Text2="Monday"
Case2
Text2="Tuesday"
Case3
Text2="Wednesday"
Case4
Text2="Thursday"
Case5
Text2="Friday"
Case6
Text2="Saturday"
Case7
Text2="Sunday"
CaseIs>7,Is<1
MsgBox"数字为1~7,重新输入"
Text1=""
Text1.SetFocus
EndSelect
EndSub
或者
PrivateSubText1_LostFocus（
IfText1>7OrText1<1Then
MsgBox"数字为1~7,重新输入"
Text1=""
Text1.SetFocus
Else
Text2=Choose（Text1,"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"
EndIf
EndSub
D.1
PrivateSubForm_Click（
Fori=1To9
PrintTab（10-i;String（2*i-1,Trim（Str（i
Nexti
EndSub
D.2
PrivateSubForm_Click（
Fori=1To10Step1
PrintTab（i;String（（20-2*i,Chr（64+i
Nexti
EndSub
D.3
PrivateSubCommand1_Click（
Dims!
t!
i&
s=1
t=1
Fori=1To100000
t=t+i
s=s+1/t
If1/t<0.00001ThenExitFor
Nexti
Print"For结构";s,i;"项"
EndSub
D.4
PrivateSubCommand1_Click（
Dimn&,pi#,i&
n=InputBox（"输入n值"
pi=2
Fori=1Ton
pi=pi*（2*i/（2*i-1*（2*i/（2*i+1Nexti
Print"当n="&n&"时,pi=";pi
EndSub
D.5
PrivateSubForm_Click（
Dims!
t!
i!
a%,n%
a=Int（Rnd*9+1
n=Int（Rnd*6+5
t=0:
s=0
Print"a=";a,"n=";n
Fori=1Ton
t=t*10+a
s=s+t
Printt;
Nexti
Print
Print"s=";s
EndSub
D.6
PrivateSubCommand1_Click（
DimsAsInteger
s=0
Fori=1To9
Forj=0To9
Fork=0To9
s=i*100+j*10+k
Ifs=i^3+j^3+k^3Then
Prints
EndIf
Nextk
Nextj
Nexti
EndSub
PrivateSubCommand3_Click（
formd6.Hide
main.Show
EndSub
D.7
PrivateSubCommand1_Click（
Dima!
x0!
x1!
a=27
x0=2
i=0
Do
i=i+1
x1=2*x0/3+a/（3*x0*x0
IfAbs（x1-x0<0.00001ThenExitDo
x0=x1
Loop
Printx1,i
EndSub
D.8
PrivateSubCommand1_Click（
s=0
x0=0.01
Fori=1To30
s=s+x0
x0=x0*2
Nexti
Prints
EndSub
D.9
PrivateSubCommand4_Click（
Picture1.Cls
Picture1.Print"x课安排在";"y课安排在";"z课安排在"Picture1.Print""
Forz=5To6
Forx=1Toz-2
ForY=x+1Toz-1
X1=Choose（Weekday（x,"周一","周二","周三","周四","周五","周六","周日"Y1=Choose（Weekday（Y,"周一","周二","周三","周四","周五","周六","周日"z1=Choose（Weekday（z,"周一","周二","周三","周四","周五","周六","周日"Picture1.Print"";X1;"";Y1;"";z1
NextY
Nextx
Nextz
EndSub
E.1
PrivateSubForm_Click（
Dima（1To10AsInteger
Fori=1To10
a（i=Int（Rnd*71+30
Printa（i;"";
Nexti
Max=a（1
Min=a（1
Avg=a（1
Fori=2To10
Ifa（i>MaxThenMax=a（i
Ifa（iAvg=Avg+a（i
Nexti
Avg=Avg/10
Print
Print"Max=";Max;"Min=";Min;"Avg=";Avg
EndSub
E.2
PrivateSubForm_Click（
Dima
a=Array（56,78,98,88,76,78
Fori=0To5
PrintString（a（i\5,"◆";a（i
Print
Nexti
EndSub
E.3
Dima%（19
PrivateSubCommand1_Click（
Picture1.Cls
Fori=0To19
a（i=Int（Rnd*101
Picture1.Printa（i;"";
If（i+1Mod4=0ThenPicture1.Print
Nexti
EndSub
PrivateSubCommand2_Click（
Picture2.Cls
Dims（5To9
Fori=0To19
k=a（i\10
SelectCasek
Case0To5
s（5=s（5+1
Case9To10'90~100分的人数
s（9=s（9+1
Case6To8'存放其他三个分数段的下标有规律,根据K获得s（k=s（k+1
EndSelect
Nexti
Fori=5To9
Ifs（i<>0ThenPicture2.Print"s（";i;"的人数有";Format（s（i,"0";"个"Nexti
EndSub
E.4
PrivateSubCommand1_Click（
Picture1.Cls
Dimd%（1To10
Fori3=1To10
Randomize
d（i3=Int（Rnd*91+10
Nexti3
Fori=1To10
Forj=1To10-i
Ifd（jt=d（j:
d（j=d（j+
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