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; else s2 += n; while (n!=0); Console.WriteLine(奇数之和=0,s1); Cons

2、ole.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 13) Console.WriteLine(输入的数值太大！); else for (i=0;i=n-1;i+) for (j=1;j15-i;j+) Console.Write( ); /每次循环显示2个空格 c=1; Console.Write(0 ,c); fo

3、r (j=1;j=i;j+) c=c*(i-j+1)/j; if (c100) if (c10) Console.Write(0 ,c); /显示3个空格 else Console.Write(0 ,c); /显示2个空格 else Console.Write(0 ,c); /显示1个空格 Console.WriteLine(); 计算的值double pi=0.0; int i; for (i=1;i=2000;i+) if (i%2=1) pi=pi+1.0/(2*i-1); else pi=pi-1.0/(2*i-1); pi=4*pi; Console.WriteLine(=0, pi

4、);求水仙花数static void Main(string args) int i, n, a, b, c; for (i = 100; i a1?a0:a1; max2=a0a1?a1:a0; for (i=2;in;i+) if (max1ai) max2=max1; max1=ai; Console.WriteLine(max1=0,max2=1,max1,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 in

5、tMax; /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; iMax; i+) for(int j=0; j4; j+) Avei += gradei,j; /累加考生成绩 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5cla

6、ss 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; 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(

7、); static void Main(string args) int no = new int 2, 4, 5, 1, 3; string name = new string 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) Person p1 = new P

8、erson(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(某人有0只腿，重量为1kg, legs, wei

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

10、nt Call(int num1, int num2); /在Delegates类的内部定义Math类和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(string args) int result; Call objCall; /委托的对象 Math objMath = n

11、ew 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); 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 pr

12、ivate object list; /存储元素数组 public List() /构造函数 list = new objectMax; 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 = listi; num-; public object get(int pos) /获取指定位置的元素 if (pos num) return listpos; else return n

13、ull; 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 Program static void Main(string args) List list = new List(); list.add(abc); list.add(1.23); list.add(2); list.add(a); Console.WriteLine(元素序列:0,list.disp

14、(); Console.WriteLine(元素个数:0,list.getnum(); Console.WriteLine(位置1的元素:0,list.get(1); Console.WriteLine(删除位置2的元素); list.delete(2); Console.WriteLine(元素序列:0, list.disp(); 课本124页11public class Student private string name; private int eng, math, sum; public int psum get return sum; public void inscore()

15、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, name, eng, math, sum); class Program const int Max = 100; static void so

16、rt(int n, params Student p)/采用冒泡排序法排序 int i, j; bool exchange; Student tmp; for (i = 0; i = i; j-) if (pj + 1.psum pj.psum) tmp = pj + 1;/pj+1pj pj + 1 = pj; pj = tmp; exchange = true; if (exchange = false) break; static void Main(string args) int n, i; Student p = new StudentMax; /定义对象引用数组 Console.

17、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

18、); /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(); 课本124上机实验6 class Student /学生类 int sno; /学号 string sname; /姓名 Course course; /Course类对象数组 int score; /课程成绩数组 double sgpa1; /常见GPA值 double sgpa2; /标准GPA值 public int psno

19、/psno属性可读可写 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(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

20、score = new intscore1.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GPA int i; double s, sumc = 0, sumgpa1 = 0, sumgpa2 = 0; for (i = 0; i = 90) s = 4.0; /点数 else if (scorei = 80) s = 3.0; else if (scorei = 70) s = 2.0; else if (scorei = 60)

21、s = 1.0; else s = 0.0; sumgpa1 += coursei.pcredits * s; sumgpa2 += coursei.pcredits * scorei; 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

22、course.Length; i+) Console.WriteLine( 0t1t2, 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 /课程类 string cname; /课程名 int credits; /课程学分 public Course() public Course(string name, int xf) /构造函数 cname = name

23、; credits = xf; public string pcname /pcname属性，课程名可读可写 get return cname; set cname = value; public int pcredits /pcredits属性，课程学分可读可写 get return credits; set credits = value; class Program static void Main(string args) Course course1 = new Course new Course(课程1,4),new Course(课程2,3), new Course(课程3,2)

24、,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); s1aaaputegpa(); s1.dispstud(); s1.dispgpa(); 课本157页7using System;using System.Collections.Generic;using System.Text;nam

25、espace Proj7_15 public class Employee private double bsalary= 1000; private double psalary; private int n; public int pn get return n; set n = value; public double compsalary() Console.Write(工作年数:); pn = int.Parse(Console.ReadLine(); psalary = bsalary+30*pn; return psalary; public class UEmployee :

26、Employee new public double compsalary() return 1.5 * baseaaapsalary(); class Program static void Main(string args) Employee emp1 = new Employee(); Console.WriteLine(该普通职工工资:0, emp1aaapsalary(); UEmployee emp2 = new UEmployee(); Console.WriteLine(该本科生职工工资:0, emp2aaapsalary(); 课本157页8public class Empl

27、oyee /普通职工类 private double bsalary = 1000; /基本工资 private double psalary; /实际工资 private int 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(Console.ReadLine(); psalary = bsalary + 30 * pn; return psalary; public cla

28、ss UEmployee : Employee /本科生职工类 public override double compsalary() return 1.5 * baseaaapsalary(); public class GEmployee : Employee /研究生职工类 public override double compsalary() return 2 * baseaaapsalary(); class Program static void Main(string args) Employee emp1 = new Employee(); Console.WriteLine(

29、该普通职工工资:0, emp1aaapsalary(); UEmployee emp2 = new UEmployee(); Console.WriteLine(该本科生职工工资:0, emp2aaapsalary(); GEmployee emp3 = new GEmployee(); Console.WriteLine(该研究生职工工资:0, emp3aaapsalary(); 课本157页9public class Person /人类 private int no; /编号 private string name; /姓名 public void input() Console.Wri

30、te( 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,name); public class Student : Person /学生类 private string sclass; /班号 private int degree; /成绩 public void input() base.input(); Console.

31、Write( 班号:); sclass = Console.ReadLine(); Console.Write( 成绩:); degree = int.Parse(Console.ReadLine(); new public void disp() base.disp(); Console.WriteLine( 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 vo

32、id input() base.input(); Console.Write( 职称:); prof = Console.ReadLine(); Console.Write( 部门:); 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 = new Student(); Teacher t1 = new Teacher(); Console.WriteLine(输入一个学生数据:); s1.input(); Console.WriteLine(输入一个教师数据:); t1.input(); Console.WriteLine(显示一个学生数据:); s1.disp(); Console.WriteLine(显示一个教师数据:); t1.disp(); 课本157页10public class Student:IC