C#代码课后习题代码

第一章：习题一、习题二

usingSystem;usingSystem.Collections.Generic;namespaceWindowsFormsApplication2

usingSystem.Linq;usingSystem.Text;publicForm1(){InitializeComponent();}

namespaceConsoleApplication1privatevoidbutton1_Click(objectsender,

EventArgse)

{classProgram{label1.Font=newFont(“华文彩云”,80);

{staticvoidMain(string[]args)label1.ForeColor=System.Drawing.Color.Blue;

{Console.WriteLine(nHelloWorld!");button1.Enabled二false;}}}

Console.Read();

}}

})

第二章习题二

privatevoidbuttonl_Click(objectsender,EventArgse){

Strings,a;

s=Convert.ToString(textBoxl.Text);

a=s.ToUpper();

textBoxl.Text=a.ToStringO;}

privatevoidbutton2_Click(objectsender,EventArgse){

Strings,a;s=Convert.ToString(textBox1.Text);

a=s.ToLower();textBox1.Text=a.ToStringO;

}))

习题六

privatevoidbuttonl_Click(objectsender,EventArgse)

{stringa;a=Convert.ToString(textBox1.Text);

MessageBox.Show(Converl.ToString(a)+,\欢迎进入C#的世界！”欢迎进入C#的世界！”,

MessageBoxButtons.OK,MessageBoxIcon.Information);}

习题三

privatevoidbuttonl_Click(objectsender,EventArgse)

(

inta,b,c,d,x;

x=Convert.ToInt32(textBox1.Text);

a=x/1000;

b=x/100-a*10;

c=x/10-a*100-b*10;

d=x%10;

textBox2.Text=Convert.ToString(a);

textBox3.Text=Convert.ToString(b);

textBox4.Text=Convert.ToString(c);

textBox5.Text=Convert.ToString(d);

)

习题四银行贷款的月还额

privatevoidbuttonl_Click(objectsender,EventArgse)

doublep,r,a,b;

intn;

p=Convert.ToDouble(textBox1.Text);

r=Convert.ToDouble(textBox2.Text);

n=Convert.ToInt32(textBox3.Text);

b=Math.Pow((l+r),n);

a=p*r*b/(b-1);

textBox4.Text=a.ToString(".##");

习题五、随机数

privatevoidbuttonl_Click(objectsender,EventArgse)

{Randomintra=newRandom();inta=intra.Next(l,101);

charb=(char)a;textBoxl.Text=Convert.ToString(a);

textBox2.Text=Convert.ToString(b);}

第三章

习题二是否是闰年

privatevoidbutton1_Click(objectsender,EventArgse)

inta;

a=Convert.ToInt32(textBoxl.Text);

if(a%4==0&&a%100!二0||a%400==0)

label2.Text="闰年";

else

label2.Text="不是闰年”;

习题三一元二次方程组

privatevoidbuttonl_Click(objectsender,EventArgse){

inta,b,c;doublex;

a=Conveil.ToInt32(textBox1.Text);b=Convert.ToInt32(textBox2.Text);

c二Convert.ToInt32(textBox3.Text);x=Math.Pow(b,2);

if(a==0)

abe14.Text="不是一元二次方程"；

else{if(x-4*a*c==0)label4.Text="有两个相等的实根”；

elseif(x-4*a*c>0)label4.Text="有两个不等的实根”;

elselabel4.Text="无解";}}

习题四

privatevoidbutton1_Click(objectsender,EventArgse)

(

doublea,b,c,m,s;

a=Convert.ToDouble(textBox1.Text);

b=Convert.ToDouble(textBox2.Text);

c=Convert.ToDouble(textBox3.Text);

m=(a+b+c)/2;

if(a>0&&b>0&&c>0)

(

if(a+b>c&&a+c>b&&b+c>a)

(

s=Math.Sqrt(m*(m・a)*(m-b)*(m・c));

label4.Text二"三角形面积为”+s;

)

else

(

MessageBox.Show(n输入错误",”提示n,MessageBoxButtons.OK,

MessageBoxIcon.Exclamation);

label4.Text=,M,;}}

else{MessageBox.Show("输入错误"，"提示"，MessageBoxButtons.OK,

MessageBoxIcon.Exclamation);

labe14.Text二}}

习题一、

privatevoidbutton1_Click(objectsender,EventArgse)

(

inta,b,c,max,min;

a=Convert.ToInt32(textBoxl.Text);

b=Convert.ToInt32(textBox2.Text);

c=Convert.ToInt32(textBox3.Text);

max=(a>b?a:b)>c?(a>b?a:b):c;

min=(a<b?a:b)<c?(a<b?a:b):c;

b=a+b+c・max-min;

label5.Text=max+”,"+b+”,"+min;

第四章习题三

privatevoidbutton1_Click(objectsender,EventArgse)

{ints=0;

for(inti=l;i<=100;i++)

for(intj=0;j<=i;j++)

{s=s+j;}

textBoxl.Text=Convert.ToString(s);

privatevoidbuttonl_Click(objectsender,EventArgse)

(

ints=0,u=0;

for(inti=1;i<=100;i++)

(

u=u+i-l;

s=s+u+i;

)

textBoxl.Text=Converl.ToString(s);

习题五、3和7的倍数

privatevoidbuttonl_Click(objectsender,EventArgse)

(

for(inti=1;i<=100;i++){

if(i%3==0&&i%7==0)

textBoxl.Text二

textBoxl.Text+”\r\n"+Convert.ToString(i);}

习题一

privatevoidbuttonl_Click(objectsender,EventArgse)

(

ints=0;

for(inti=l;i<=100;i++){

s=s+i;

}

textBoxl.Text=Convert.ToString(s)

第五章习题六

privatevoidbuttonl_Click(objectsender,EventArgse)

{int[]a;inti,n;

n二Convert.ToInt32(textBox1.Text);

BestPersonf=newBestPerson();f.getBestPosition(n,outa);

for(i=0;i<n;i++)

textBox3.Text=textBox3.Text+Convert.ToString(a[i]);}

publicpartialclassBestPerson{

publicvoidgetBestPosition(inta,outint[]s)

{s=newint[50];inti,j=-1,k;

for(i=0;i<a;i++){s[i]=0;}

for(i=1;iv=a;i++)

{k=0;

do{j++;if(j=a)j=0;if(s[j]==0)k++;

}while(k!=7);

s[j]=i；

})

第五章习题八

privatevoidbuttonl_Click(objectsender,EventArgse)

(

Students=newStudent();

MasterStudentm=newMasterStudent();

m.Age=Convert.ToInt32(textBox2.Text);

m.Name=textBoxl.Text;

m.Number=textBox4.Text;

m.Sex二textBox3.Text;

m.Major=textBox5.Text;

m.Teacher=textBox6.Text;

if(m.UpdateAge(m.Age))

m.sayHallo();

elseMessageBox.Show("年龄有错!)

publicclassStudent

{privatestringnumber;publicstringNumber

{get{returnnumber;}

set{number=value;}}

privatestringname;publicstringName

{get{returnname;}set{name=value;}}

privatestringsex;

publicstringSex{get{returnsex;}set{sex=value;}

privateintage;

publicintAge{get{returnage;}set{age=value;}}

publicBooleanUpdateAge(inta){

if(a>0&&a<=120){age=a;returntrue;}

else

returnfalse;}

publicvoidsayHallo(){

MessageBox.Show("我是一名学生，我的名字是：n+Name.ToStringO+年龄：

”+Age.ToStringO+”,性别：”+Sex.ToStringO+“，学号："+Number.ToStringO);}}

publicclassMasterStudent:Student{

publicstringMajor;

publicstringTeacher;

publicnewvoidsayHallo(){

MessageBox.Show("我是一名研究生,我的名字是:"+Name.ToStringO+年龄：”+

Age.ToStringO+\性别：”+Sex.ToStringO+”，学号：n+Number.ToStringO+",方向：

“+Major+”，指导老师"+Teacher);}}}

习题5

intfac(intn){if(n>0){

if(n==1)return(1);

elsereturn(n*fac(n-1));}

elsereturn1;}

privatevoidbuttonl_Click(objectsender,EventArgse)

{intn,s;

n=Convert.ToInt32(textBox1.Text);

s=fac(n);

textBox2.Text二Convert.ToString(s);}

}

)

第六章习题七

privatevoidbuttonl_Click(objectsender,EventArgse)

(

inti;party[]p=newparty[3];

partypl=newparty。；communistPartyp2=newcommunistPartyO;

kuomintangp3=newkuoinintangO;

p[O]=pl；p[l]=p2;p[2]=p3;

for(i=0;i<3;i++)

p[i].sayPolicy();}}

publicclassparty

{publicvirtualvoidsayPolicyO{

MessageBox.Show("两岸同属于一个中国。”)；

})

publicclasscommunistPai'ty:party{

publicoverridevoidsayPolicyO{

MessageBox.Show("两岸同属于一个中国，用一国两制统一中国。")；

})

publicclasskuomintang:party{

publicoverridevoidsayPolicy(){

MessageBox.Show("两，同属于一个中国，用三民主义统一中国。")；)

})

privatevoidbuttonl_Click(objectsender,EventArgse)

{Catc=newCat();=textBoxl.Text;

Mousem=newMouse();=textBox2.Text;

c.getUp十=newsayGetUpDelegate(m.sayGetUp);

c.crow();}}

习题八

publicdelegatevoidsayGetUpDelegate();

publicclassCat

(

publiceventsayGetUpDelegategetUp;

publicstringname;

publicvoidcrow()

(

Messag6Box.Show(name+”口芮〜啼〜啼〜口帝〜喷〜喷〜”)；

getUp();

)

)

publicclassMouse

(

publicstringname;

publicvoidsayGetUp()

(

MessageBox.Show(name+"快跑!!!!");

习题九

privatevoidbutton1_Click(objectsender,EventArgse)

{traint=newtrain();=textBoxl.Text;

catc=newcat();=textBox2.Text;

c.h=Convert.ToInt16(textBox3.Text);

t.nshow();c.nshow();}

privatevoidbutton2_Click(objectsender,EventArgse)

{traint=newtrain();

catc=newcat();

t.shout();

c.shout();}}

publicinterfacemakeVoice{inth{get;set;}voidshout();}

publicabstractclassVehicle{publicstringname;publicabstractvoidnshow();}

publicabstractclassAnima{publicstringname;publicabstractvoidnshow();}

publicclasstrain:Vehicle,makeVoice{intH;publicinth

{get{returnthis.H;}set{this.H=value;}}

publicoverridevoidnshow(){MessageBox.Show("train的名字是”+name);}

publicvoidshout(){MessageBox.Show(”train"+”呜呜嗒嗒。。。…呜呜嗒嗒)}}

publicclasscat:Aniinal,makeVoice{intH;

publicinth{

get{returnthis.H;}

set{this.H=value;}}

publicoverridevoidnshow(){

MessageBox.Show(ncatfi\J^^^"+name+,,^j^^',+h);)

publicvoidshout(){

MessageBox.Show(“cat"+"哺唯瞄。。…。唯嘀嘀");}}}

第七章习题一

随机产生10个两位整数，找出其中最大值，最小值、高于平均数的数

privatevoidbuttonl_Click(objectsender,EventArgse){

intsum=0;intz;Randomra=newRandom();

int[]a=newint[10];

for(inti=0;i<a.Length;i++){a[i]=ra.Next(10,100);}

z，

for(inti=0;i<a.Length;i++){textBoxl.Text十二Convert.ToString(a[i]+")};

for(inti=0;i<a.Length;i++){sum+二a[i]};

z=sum/10;

textBox4.Text=Convert.ToString(z)

for(inti=0;i<a.Length;i++)

(

if(a[i]>=z)

(

textBox5.Text+=Convert.ToString(a[i]+〃)；

)

}Array.Sort(a);

textBox2.Text二Convert.ToString(a[9]);

textBox3.Text=Convert.ToString(a[0]);}

产生10个学生的成绩，并用冒泡进行排序

privatevoidbuttonlClick(objectsender,EventArgse){

Randomra=newRandom();

int[]a=newint[10];

for(inti=0;i<a.Length;i++){a[i]=ra.Next(1,100);

textBoxl.Text+二Convert.ToString(a[i]+"〃)；}

for(inti=0;i<a.Length-1;i++)

{for(intj=i+1;j<a.Length;j++)

{if(a[i]<a[j])

{intt;t=a[i];a[i]=a[j];a[j]=t;}}}

for(inti=0;i<a.Length;i++)

{textBox2.Text+=Convert.ToString(a[i]+〃〃);}}

交错数组

privatevoidbuttonl_Click(objectsender,EventArgse)

(

int[][]jcArray=newint[4][];

jcArrayfO]=newint[]{1,32,89,6,8};

jcArray[l]=newint[]{2,17,8};

jcArray[2]=newint[]{3,5};

jcArray[3]=newint[]{4,9,23,12);

textBoxl.Text=”交错数组的数据:"+"\r\n”；

foreach(intf]jinjcArray)

(

intx=0;

foreach(intiinj)

{

x+=i;

textBoxl.Text+=Convert.ToString(i)+n\tn;

)

textBoxl.Text+="\r\n"+”该行数据总和为：

n+Convert.ToString(x)+"\r\nH;

}}}}

用二维数组存储学生成绩

privatevoidbuttonl_Click(objectsender,EventArgse)

(

int[,]cj={{1001,93},{1004,78},{1002,59},{1005,87},{2001,55}};

textBoxl.Text=〃学生成绩〃；

for(inti=0;i<cj.GetLength(0);i++)

for(intj=0;j<cj.GetLength(1);j++)

{if(j=1)

textBoxl.Text=textBoxl.Text+〃\t〃+Convert.ToString(cj[i,j]);

elsetextBoxl.Text=textBoxl.Text++Convert.ToString(cj[i,j]);

textBoxl.Text=textBoxl.Text+〃\r\n〃+〃不及格的学生”;

for(inti=0;i<cj.GetLength(O);i++)

if(cj[i,1]<60)

textBoxl.Text=textBoxl.Text+〃\r\n〃+Convert.ToString(cj[i,0])+

，z\t/z+Convert.ToString(cj[i,1])

textBoxl.Text+=〃\r\rT+〃平均成绩〃；

intsum=0;intz;;

for(inti=0;i<cj.GetLength(O);i++)

{sum+=cj[i,1];}

z=sum/cj.GetLength(O);

textBoxl.Text+=Convert.ToString(z);}}}

第十章

简易文本编辑器

privatevoidbuttonl_Click(objectsender,EventArgse)

(

richTextBoxl.Text=〃〃；

)

privatevoidbutton2_Click(objectsender,EventArgse)

(

openFileDialogl.FileName=〃〃;

openFileDialogl.ShowReadOnly=true;

openFileDialogl.ReadOnlyChecked=true;

openFileDialogl.Filter=text|text|RTF文件(*.rtf)|rtf〃;

if(openFileDialogl.ShowDialogO==DialogResult.OK)

richTextBoxl.LoadFi1e(openFi1eDialog1.FileName,

RichTextBoxStreamType.RichText);

)

privatevoidbutton3_Click(objectsender,EventArgse)

(

saveFi1eDialog1.InitialDirectory=

saveFileDialogl.Filter=〃*.texttext|RTF文件(*.rtf)*.rtf”;

if(saveFileDialogl.ShowDialogO==DialogResult.OK)

richTextBoxl.SaveFile(saveFileDialogl.FileName,

RichTextBoxStreamType.RichText);

)

privatevoidbutton4_Click(objectsender,EventArgse)

(

fontDialogl.ShowApply=true;

if(fontDialogl.ShowDialogO==DialogResult.OK)

richTextBoxl.Font=fontDialogl.Font;

privatevoidbutton5_Click(objectsender,EventArgse)

{

colorDialogl.ShowHelp=true;

if(colorDialogl.ShowDialogO==DialogResult.OK)

richTextBoxl.SelectionColor=colorDialogl.Color;

)

privatevoidForml_Load(objectsender,EventArgse)

(

)

}

)

第H^一章

通讯录(数据库)

OleDbConnectionmConn=newOleDbConnectionO;

OleDbDataAdaptermAdapter;

01eDbCommandBui1dermBuilder;

DataTablemDatatable=newDataTable();

intmRowposition=0;

privatevoidshowRecord()

(

if(mDatatable.Rows.Count==0)

{

textBoxl.Text=〃〃；

textBox2.Text=〃〃；

textBox3.Text=〃〃；

textBox4.Text=〃〃；

textBox5.Text=〃〃；

)

textBoxl.TextmDatatable.Rows[mRowposition][〃编号

ToStringO;

textBox2.TextmDatatable.Rows[mRowposition][〃姓名

〃]・ToStringO；

textBox3.TextmDatatable.Rows[mRowposition][〃性别

ToStringO；

textBox4.TextmDatatable.Rows[mRowposition][〃籍贯

〃]・ToStringO；

textBox5.TextmDatatable.Rows[mRowposition][〃电话

〃].ToStringO；

)

publicForml0

InitializeComponent();

privatevoidlabell_Click(objectsender,EventArgse)

privatevoidForml_Load(objectsender,EventArgse)

(

mConn.ConnectionString=@，zProvider

=Microsoft.Jet.OLEDB.4.0;DataSource=F:\新建文件夹\1208150129林相玲(12)\

通讯录.mdb〃；

mConn.Open();

mAdapter=newOleDbDataAdapter(，zselect*from通讯录〃，mConn);

mBuilder=newOleDbCommandBuiIder(mAdapter);

mAdapter.Fill(mDatatable);

this.showRecord();

)

privatevoidForml_FormClosing(objectsender,FormClosingEventArgse)

(

mConn.Close();

mConn.Dispose();

)

privatevoidlabel5_Click(objectsender,EventArgse)

(

)

privatevoidbuttonl_Click(objectsender,EventArgse)

{

mRowposition=0;

this.showRecord();

}

privatevoidbutton2_Click(objectsender,EventArgse)

(

if(mRowposition<mDatatable.Rows.Count-1)

(

mRowposition=mRowposition+1;

this.showRecord();

)

)

privatevoidbutton3_Click(objectsender,EventArgse)

(

if(mRowposition!=0)

mRowposition=mRowposition-1;

this.showRecord();

}

privatevoidbutton4_Click(objectsender,EventArgse)

if(mDatatable.Rows.Count!=0)

mRowposition=mDatatable.Rows.Count-1;

this.showRecord();

)

privatevoidbutton5_Click(objectsender,EventArgse)

(

if(button5.Text==〃添加〃)

{

button5.Text=〃确认添加〃；

textBoxl.Text=〃〃；

textBox2.Text=〃〃；

textBox3.Text=〃〃；

)

else

(

button5.Text=〃添加〃；

DataRowmNewrow=mDatatable.NewRowO;

mNewrow[”编号〃]=textBoxl.Text;

mNewrow[〃姓名〃]=textBox2.Text;

mNewrow[〃电话号码〃]=textBox3.Text;

mDatatable.Rows.Add(mNewrow);

mAdapter.Update(mDatatable);

mRowposition=mDatatable.Rows.Count-1;

this.showRecord();

)

}

privatevoidbutton6_Click(objectsender,EventArgse){

if(mDatatable.Rows.Count!=0){

mDatatable.Rows[mRowposition][〃编号〃]=textBoxl.Text;

mDatatable.Rows[mRowposition][〃姓名〃]=textBox2.Text;

mDatatable.Rows[mRowposition][〃电话号码〃]=textBox3.Text;

mAdapter.Update(mDatatable);

)

)

privatevoidbutton7_Click(objectsender,EventArgse)

(

if(mDatatable.Rows.Count!=0)

(

mDatatable.Rows[mRowposition].Delete();

mAdapter.Update(mDatatable);

mRowposition=mRowposition-1;

this.showRecord();

privatevoidbutton8_Click(objectsender,EventArgse)

(

Booleanf=false;

DataRowmrow;

for(inti=0;i<mDatatable.Rows.Count;i++)

(

mrow=mDatatable.Rows[i];

if(Convert.ToString(mrow[〃编号〃])==〃01〃){

f=true;

mRowposition=i;

this.showRecord();

break;}

if(f==false)

MessageBox.Show(〃没有找到！！〃)；}}}}

第八章

文件的加密解密

publicpartialclassForml:Form

(

DESdes=newDESCryptoServiceProvider();

publicForml()

(

InitializeComponent();

}

privatevoidbuttonl_Click(objectsender,EventArgse)

(

inti;

FileStreamfin=newFileStream(textBoxl.Text,FileMode.Open,

FileAccess.Read);

FileStreamfout=newFileStream(textBox2.Text,

Fi1eMode.OpenOrCreate,FileAccess.Write);

fout.SetLength(O);

Byte[]bin=newbyte[100];

longrdlen=0;

longtolen=fin.Length;

intlen;

textBox3.Text=des.Key[0].ToStringO;

for(i=0;i<8;i++)

{

textBox3.Text=textBox3.Text+〃,〃+des.Key[i].ToStringO；

)

CryptoStreamencStream=newCryptoStream(fout,

des.CreateEncryptor(),CryptoStreamMode.Write);

while(rdlen<tolen)

(

len=fin.Read(bin,0,100);

encStream.Write(bin,0,len);

rdlen=rdlen+len;

)

encStream.Close();

fout.Close();

fin.Close();

)

privatevoidbutton2_Click(objectsender,EventArgse)

{

inti;

FileStreamfin=newFileStream(textBox2.Text,FileMode.Open,

FileAccess.Read);

FileStreamfout=newFileStream(textBox4.Text,

FileMode.OpenOrCreate,FileAccess.Write);

fout.SetLength(0);

Byte[]bin=newbyte[100];

longrdlen=0;

longtolen=fin.Length;

intlen;

textBox3.Text=des.Key[0].ToStringO;

for(i=0;i<8;i++)

(

textBox3.Text=textBox3.Text+〃,〃+des.Key[i].ToStringO;

)

CryptoStreamencStreaml=newCryptoStream(fout,

des.CreateDecryptor(),CryptoStreamMode.Write);

while(rdlen<tolen)

(

len=fin.Read(bin,0,100);

encStreaml.Write(bin,0,len);

rdlen=rdlen+len;

)

encStreaml.Close();

fout.Close();

fin.Close();

)

)

}

绘制五环

privatevoidbuttonl_Click(objectsender,EventArgse)

Penpel,pe2,pe3,pe4,pe5;