c#程序设计教程(课后习题答案代码)

1、判断是否是闰年课本 63用户输入整数反向显示课本 67或 68乘法表 课本 69判断从键盘输入大于3的整数是否为素数课本 70求输入所以数其中正数的和课本 70求1平方+2平方+n平方 小于等于1000的最大n 课本71或72读入一组数(以0结束) ，分别求奇数和偶数和static void Main( string args) int n,s1=0,s2=0; do n =int .Parse( Console.ReadLine();if (n%2=1)s1 += n;elses2 += n; while (n!=0);Console .WriteLine(" 奇数之和=0&quo

2、t; ,s1);Console .WriteLine(" 偶数之和=0" ,s2);输入正整数n计算S=1+(1+2)+(1+2+3)+(1+2+.+n)int n,i,j,s=0;Console .Write( "n:" );n =int .Parse( Console .ReadLine();for (i = 1; i <= n; i+)for (j = 1; j <= i; j+)s += j;Console .WriteLine( "s=0" , s);杨辉三角static void Main( string ar

3、gs) int i,j,c,n;Console .Write( "n:" );n= int .Parse( Console .ReadLine(); if (n>13)Console .WriteLine( " 输入的数值太大！" );else for (i=0;i<=n-1;i+)for (j=1;j<15-i;j+)Console .Write( " " );/ 每次循环显示2个空格c=1;Console .Write( "0 ",c);for (j=1;j<=i;j+) c=c*(i-

4、j+1)/j;if (c<100)if (c<10)Console .Write( "0 ",c);/ 显示3个空格else Console .Write( "0 ",c);/ 显示2个空格elseConsole .Write( "0 " ,c);/ 显示 1个空格Console .WriteLine();计算无的值double pi=0.0;int i;for (i=1;i<=2000;i+)if (i%2=1)pi=pi+1.0/(2*i-1);elsepi=pi-1.0/(2*i-1);pi=4*pi;Cons

5、ole .WriteLine("无=0” , pi);求水仙花数static void Main( string args) int i, n, a, b, c;for (i = 100; i <= 999; i+) n = i;c = n % 10; n = n / 10;b = n % 10; n = n / 10;a = n;if (a * a * a + b * b * b + c * c * c = i)Console .WriteLine( "0 1 2 = 3", a, b, c,a*a*a+b*b*b+c*c*c);/Console.Writ

6、e("0 ", i);Console .WriteLine();假设10个整数用一维数组存放，求最大值和次大值static void Main( string args) int a = new int 101,8,10,4,7,9,6,10,2,5;int n=10,max1,max2,i;max1=a0>a1?a0:a1;max2=a0>a1?a1:a0;for (i=2;i<n;i+)if (max1<ai)max2=max1;max1=ai;Console .WriteLine( "max1=0,max2=1" ,max1

7、,max2);用一个二维数组存放5个考生4门功课的考试成绩，求每位考生的平均成绩课本89页static void Main( string args) const int Max = 5;/ 考生数int Ave = new int Max;/ 定义一个一维数组存储考生的总成绩int , grade=88,75,62,84,96,85,75,92,/ 定义二维数组存储考生成绩68,63,72,78,95,89,76,98,76,65,72,63;for ( int i=0; i<Max; i+)for ( int j=0; j<4; j+) Avei += gradei,j;/ 累

8、加考生成绩for ( int k = 0; k < Max; k+)Console .WriteLine( "考生 0 平均成绩=1 " ,k+1, Avek/4.0);用俩个一维数组分别存放5个学生的学号和姓名，分别按学号和姓名排序课本 89页上级实验5class Program const int Max = 5;static void disp( int no, string name, string str) Console .WriteLine(str);Console .Write( " 学号 :t" );for ( int i = 0

9、; i < no.Length; i+)Console .Write( "0t",noi);Console .WriteLine();Console .Write( " 姓名 :t" );for ( int i = 0; i < name.Length; i+)Console .Write( "0t", namei);Console .WriteLine();static void Main( string args) int no = new int 2, 4, 5, 1, 3;string name = new str

10、ing "Smith" , "John" , "Mary" , "Cherr" , "Tomn"disp(no, name," 排序前：" );Array .Sort(no, name);disp(no, name," 按学号排序后：" );Array .Sort(name, no);disp(no, name,"按姓名排序后：" );课本124页 8class Program static void Main( string args

11、) Person p1 = new Person (2, 50);Animal a1 = new Animal ();p1.show();a1.show();public class Person/ 定义人类 public int legs;/ 腿的只数protected float weight; / 重量public Person()/ 默认构造函数 public Person( int legs1, float weight1) / 自定义方法F legs= legs1;weight = weight1;public void show() Console .WriteLine( &qu

12、ot; 某人有 0 只腿，重量为1kg" , legs, weight);class Animal/ 定义动物类 public int num;/ 腿的条数private float weight;public Animal() public Animal( int n, float num = n;weight = w;public void show()/ 重量/Animal 类的默认构造函数w) /Animal 类带2个参数的构造函数Console .WriteLine(" 某动物有0 只脚，重量为1kg" , num, weight);课本 124页 9/

13、 定义了一个委托，委托在传递方法时，方法必须带两个int 型的参数。public delegate int Call ( int num1, int num2);/ 在Delegates 类的内部定义 Mathl和 TestDelegates 类 class Math public int fun1( int num1, int num2) return num1*num1+num2*num2;public int fun2( int num1, int num2) return num1*num1-num2*num2;class Program static void Main( strin

14、g args) int result;Call objCall;/ 委托的对象Math objMath = new Math(); /Math 类的对象objCall =new Call (objMath.fun1);result = objCall(5, 3);/ 将委托实例化Console .WriteLine( " 结果为 0" , result);objCall =new Call (objMath.fun2);result = objCall(5, 3);/ 将委托实例化Console .WriteLine( " 结果为 0" , result

15、);课本 124页 10class List private int Max = 100;/ 存储最多元素private int num = 0;/ 存储的实际元素个数private object list; / 存储元素数组public List()/ 构造函数 list =new object Max;public void add( object obj) / 添加一个元素 listnum = obj;num+;public void delete( int pos) / 删除一个元素 for ( int i = pos + 1; i < num; i+)listi - 1 = l

16、isti;num-;public object get( int pos) / 获取指定位置的元素 if (pos < num)return listpos;elsereturn null ;public int getnum() / 获取实际元素个数 return num;public string disp() / 获取所有元素 string s = "" ;for ( int i = 0; i < num; i+)s += listi +" " ;return s;class Programstatic void Main( strin

17、g args)List list =new List ();list.add("abc" );list.add(1.23);list.add(2);'a' );list.add(Console .WriteLine(Console .WriteLine(Console .WriteLine(Console .WriteLine(" 元素序列:0" ,list.disp();" 元素个数:0" ,list.getnum();" 位置 1的元素 :0" ,list.get(1);" 删除位置2

18、的元素" );list.delete(2);Console .WriteLine(" 元素序列:0" , list.disp();课本124页 11publicclass Studentprivatestring name;privateint eng, math, sum;publicint psumgetreturn sum; publicvoid inscore()Console .Write( "姓名 :" );name =Console.ReadLine();Console .Write( " 英语 :" );en

19、g =int .Parse( Console .ReadLine();Console .Write( " 数学 :" );math =int .Parse(Console.ReadLine();sum = eng + math;public void display()Console .WriteLine("t0t1t2t3", name, eng, math, sum);class Programconst int Max = 100;static void sort( intn, params Student p)/ 采用冒泡排序法排序int i,

20、j;bool exchange;Student tmp;for (i = 0; i < n - 1; i+) exchange =false ;for (j = n - 2; j >= i; j-)if (pj + 1.psum > pj.psum) tmp = pj + 1;/pj+1<->pjpj + 1 = pj;pj = tmp;exchange =true ;if (exchange = false ) break ;static void Main( string args) int n, i;Student p = new Student Max;

21、/ 定义对象引用数组 Console .Write( "n:" );n =int .Parse( Console .ReadLine();for (i = 0; i < n; i+)/ 创建对象引用的实例pi =new Student ();for (i = 0; i < n; i+) Console .WriteLine( "输入第 0 个学生数据:" , i + 1);pi.inscore();Console .WriteLine( " 排序前 :" );Console .WriteLine( "t 姓名 t

22、 英语t 数学 t 总分 " );for (i = 0; i < n; i+)Console.Write( "序号 0:" , i + 1);pi.display();sort(n, p);/ 按总降序排序Console .WriteLine( " 排序后 :" );Console .WriteLine( "t 姓名 t 英语t 数学 t 总分 " );for (i = 0; i < n; i+) Console .Write( "第 0 名 :" , i + 1);pi.display();

23、课本124上机实验6/ 学生类/ 学号/ 姓名/Course 类对象数组/ 课程成绩数组class Student int sno;string sname;Course course;int score;double sgpa1;double sgpa2;/常见GPA： /标准GPA. /psno 属性可读可写public int psno get return sno; set sno =value ; public string psname/psname 属性可读可写 get return sname; set sname =value ; public void setcourse(

24、 params Course course1) / 设置课程 course =new Coursecourse1.Length;for ( int i = 0; i < course1.Length; i+) coursei = course1i; public void setscore( int score1) / 设置分数 score =new int score1.Length;for ( int i = 0; i < score1.Length; i+) scorei = score1i;public void computegpa() / 根据课程的学分以及学生成绩计算

25、GPA int i;double s, sumc = 0, sumgpa1 = 0, sumgpa2 = 0;for (i = 0; i < score.Length; i+)if (scorei >= 90)s = 4.0;/ 点数else if (scorei >= 80)s = 3.0;else if (scorei >= 70)s = 2.0;else if (scorei >= 60)s = 1.0; elses = 0.0;sumgpa1 += coursei.pcredits * s;sumgpa2 += coursei.pcredits * sco

26、rei;sumc += coursei.pcredits;sgpa1 = sumgpa1 / sumc;sgpa2 = sumgpa2 * 4 / sumc / 100;public void dispstud()/ 输出学生信息 Console .WriteLine("学号:0t 姓名 :1" , sno, sname);Console .WriteLine( " 课程名 t 学分 t 分数 " );for ( int i = 0; i < course.Length; i+)Console .WriteLine( " 0t1t2&qu

27、ot;, coursei.pcname, coursei.pcredits,scorei);public void dispgpa() / 输出 GPA Console.WriteLine("常见算法GPA=0:n, 标准算法GPA=1:n" , sgpa1, sgpa2);class Course string cname;int credits;public Course() public Course( string name, int xf) cname = name;credits = xf;public string pcname get return cnam

28、e; set cname =value ; public int pcredits get return credits; set credits =valueclass Program static void Main( string Course course1 =/ 课程类/ 课程名/ 课程学分 args)new Course / 构造函数/pcname 属性，课程名可读可写/pcredits 属性，课程学分可读可写new Course ( " 课程1" ,4), new Course( "课程 2" ,3)new Course( " 课

29、程 3" ,2),new Course ( " 课程 4" ,6), new Course( " 课程 5" ,3);int score1 = new int 92, 80, 98, 70, 89 ;Student s1 = new Student ();s1.psno = 1; s1.psname ="王华 " ;s1.setcourse(course1);s1.setscore(score1);putegpa();s1.dispstud();s1.dispgpa();课本157页 7using System;using

30、System.Collections.Generic;using System.Text;namespace Proj7_15 public class Employeeprivateprivatedouble bsalary= 1000;double psalary;privateint n;publicint pn get return n; set n = value ; public double compsalary() Console .Write( " 工作年数:" );pn =int .Parse( Console.ReadLine();psalary =

31、bsalary+30*pn;return psalary;public class UEmployee : Employee new public double compsalary() return 1.5 * psalary();class Program static void Main( string args) Employee emp1 = new Employee();psalary();, psalary();Console .WriteLine( " 该普通职工工资:0" ,UEmployee emp2 = new UEmployee();Console

32、.WriteLine( " 该本科生职工工资:0"课本157页 8public class Employee / 普通职工类privatedoublebsalary = 1000;/ 基本工资privatedoublepsalary;/ 实际工资privateint n;/ 工作年数public int pn get return n; set n = value ; public virtual double compsalary() / 计算普通员工工资 Console .Write( "工作年数:" );pn =int .Parse( Consol

33、e.ReadLine();psalary = bsalary + 30 * pn;return psalary;public class UEmployee : Employee / 本科生职工类 public override double compsalary() return 1.5 * psalary();public class GEmployee : Employee / 研究生职工类 public override double compsalary() return 2 * psalary();class Program static void Main( string arg

34、s) Employee emp1 = new Employee();Console .WriteLine( " 该普通职工工资:0" , psalary();UEmployee emp2 = new UEmployee();Console .WriteLine( " 该本科生职工工资:0" , psalary();GEmployee emp3 = new GEmployee();Console .WriteLine( " 该研究生职工工资:0" , psalary();课本 157页 9public class Person/ 人类

35、private int no;/ 编号private string name; / 姓名public void input() Console .Write( " 编号 :" );no =int .Parse( Console.ReadLine();Console .Write( " 姓名 :" );name = Console.ReadLine();public void disp() Console .WriteLine( " 编号 :0" ,no);Console .WriteLine( " 姓名 :0" ,

36、name);public class Student :Person/学生类 private string sclass;/ 班号private int degree;/成绩public void input() base.input();Console .Write( "班号:" );sclass =Console .ReadLine();Console .Write( "成绩:" );degree =int .Parse( Console.ReadLine();new public void disp() base.disp();Console .W

37、riteLine( "班号:0" ,sclass);Console .WriteLine( "成绩:0" ,degree);public class Teacher : Person / 教师类 private string prof;/ 职称private string depart;/ 部门public void input() base.input();Console .Write( " 职称 :" );prof =Console .ReadLine();Console .Write( " 部门 :" );

38、depart =Console .ReadLine();new public void disp() base.disp();Console .WriteLine( "职称:0" , prof);Console .WriteLine( "部门:0" , depart);class Program static void Main( string args)Student s1 =Teacher t1 = newConsole .WriteLine(Console .WriteLine(Console .WriteLine(Console .WriteLi

39、ne(new Student ();Teacher ();" 输入一个学生数据:");s1.input()" 输入一个教师数据:");t1.input();" 显示一个学生数据:");s1.disp();" 显示一个教师数据:"); t1.disp();课本 157页 10publicclass Student : IComparableprivate string name;private int eng, math, sum;public int psum get return sum; public void

40、 inscore() Console .Write( "姓名 :" );name = Console.ReadLine();Console .Write( " 英语 :" );eng =int .Parse( Console .ReadLine();Console .Write( " 数学 :" );math =int .Parse( Console .ReadLine();sum = eng + math;public void display() Console .WriteLine( "t0t1t2t3",

41、name, eng, math, sum); public int CompareTo( object obj) / 实现接口方法 Student s = ( Student )obj;/ 转换为 Student 实例if (psum < s.psum) return 1;else if (psum = s.psum) return 0;else return -1;class Program static void Main( string args) int n, i;ArrayList myarr = new ArrayList ();Student p;/ 定义对象引用Conso

42、le .Write( "n:" );n =int .Parse( Console .ReadLine();for (i = 0; i < n; i+) Console .WriteLine( "输入第 0 个学生数据:" , i + 1);p =new Student ();/ 创建对象引用实例p.inscore();myarr.Add(p);Console .WriteLine( " 排序前 :" );Console .WriteLine( "t 姓名 t 英语t 数学 t 总分 " );i = 1;for

43、each ( Student s in myarr)Console .Write( "序号0:" , i+);/ 按总分降序排序s.display(); myarr.Sort();Console .WriteLine(" 排序后 :" );Console .WriteLine("t 姓名 t 英语t 数学 t 总分 " );i = 1;foreach ( Student s in myarr)Console .Write( "第 0 名 :" , i+);s.display(); 课本157页上机实验7public

44、 class BClass/ 基类 private string name; / 名称 private int no;/ 编号public BClass( string na, int n) / 构造函数 name = na; no = n;public void show() Console .Write( "0(1)", name, no);public class Book : BClass / 图书类 string author;/ 作者public Book( string na, int n, string auth):base(na, n) author =

45、auth;public void showBook() base.show();Console .Write( " 作者 :0" , author); public class Reader : BClass / 读者类 Book rent;/ 所借图书int top; public Reader( string na, int n):base(na, n) / 构造函数 rent =new Book5;top = 0; public void rentBook( ref Book b) renttop = b;top+; public void showReader()

46、Console .Write( " 读者 :" );base.show();Console .WriteLine( " 所借图书:" );for ( int i = 0; i < top; i+)/5 个空格Console .Write( "0:", i + 1);renti.show();Console .WriteLine(); class Program static void Main( string args) Book bl = new Book( "C语言", 100,"潭浩强&quo

47、t;);Book b2 = new Book( "数据结构" ,110, "严蔚敏"Book b3 = new Book( "软件工程" ,210,"陈华 ");Book b4 = new Book( "操作系统" ,208,"张明 ");Reader r1 = new Reader( " 王华 " ,1234);Reader r2 = new Reader( " 李兵 " ,2600);r1.rentBook(refb1);r1.re

48、ntBook(refb2);r1.rentBook(refb3);r2.rentBook(refb4);r1.showReader();r2.showReader();课本200页 3public partial class Form1 : Form int n = 0;/ 保存用户错误输入的次数public Form1() InitializeComponent();private void button1_Click( object sender, EventArgs e) if (textBox1.Text ="1234" && textBox2.Te

49、xt ="1234" ) MessageBox.Show( " 用户名 /口令正确");this .Close();/ 调用其他程序elseif (n<3)MessageBox.Show( " 用户名 /口令错误, 再次输入" );n+;elseMessageBox.Show( " 已经错误输入三次，退出");this .Close();课本200页 4public partial class Form2 : Form public Form2() InitializeComponent();private

50、void rbutton1_CheckedChanged( object sender, EventArgs e) Font f = new Font ( "宋体 " ,textBox1.Font.Size,textBox1.Font.Style); textBox1.Font = f;private void rbutton2_CheckedChanged( object sender, EventArgs e) Font f = new Font ( "楷体 _GB2312", textBox1.Font.Size, textBox1.Font.St

51、yle);textBox1.Font = f;/textBox1.Font.Name = " 楷体 _GB2312"private void rbutton3_CheckedChanged( object sender, EventArgs e) Font f = new Font (textBox1.Font.Name, 10, textBox1.Font.Style); textBox1.Font = f; private void rbutton4_CheckedChanged( object sender, EventArgs e) Font f = new Fon

52、t (textBox1.Font.Name, 16, textBox1.Font.Style); textBox1.Font = f;private void checkBox1_CheckedChanged( object sender, EventArgs e) if (checkBox1.Checked)Font f = new Font (textBox1.Font.Name, textBox1.Font.Size,FontStyle .Bold);textBox1.Font = f;elseFont f = new Font (textBox1.Font.Name, textBox1

53、.Font.Size,FontStyle .Regular);textBox1.Font = f; 课本200页5public partial class Form3 : Form int a=0, b=0;public Form3()InitializeComponent();private void Form3_Load( object sender, EventArgs e) listBox1.Items.Add("12" );listBox1.Items.Add("10" );listBox1.Items.Add("5" );

54、listBox1.Items.Add("8" );listBox1.Items.Add("22" );listBox1.Items.Add("25" );listBox1.Items.Add("9" );listBox2.Items.Add("9" );listBox2.Items.Add("15" );listBox2.Items.Add("20" );listBox2.Items.Add("32" );listBox2.Items.

55、Add("18" );listBox2.Items.Add("5" );listBox2.Items.Add("7" );listBox2.Items.Add("32" ); private void listBox1_SelectedIndexChanged( object sender, EventArgs e) a = int .Parse(listBox1.Text); private void listBox2_SelectedIndexChanged( object sender, EventArgs e) b = int .Parse(listBox2.Text);listBox3.Items.Add(string .Format( "0 x1=2" ,a,b,a*b); privatevoid listBox3_SelectedIndexChanged(object sender, EventArgs e) if (listBox3.SelectedIndex&g