第四版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&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 args) i

3、nt 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-j+1)/j; if (

4、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 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.Wr

5、iteLine("=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 int101,8,10,4,7,9,6,10,2,5; 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",

7、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 intMax; /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,

8、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; i &

9、lt; 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 string "

10、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 Pe

11、rson(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"

12、, legs, weight); 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

13、型的参数。 public delegate int 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;

14、/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); 课本124页10class List private int Max =

15、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 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) /

16、获取指定位置的元素 if (pos < num) return listpos; else return 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 Program static void Main(string args) List list = new List(); list.a

17、dd("abc"); list.add(1.23); list.add(2); list.add('a'); Console.WriteLine("元素序列:0",list.disp(); 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.WriteLin

18、e("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() Console.Write("姓名:"); name = Console.ReadLine(); Console.Write("英语:"); eng = int.Parse(Console.ReadLine(); Consol

19、e.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 sort(int n, params Student p)/采用冒泡排序法排序 int i, j; bool exchange; Student tmp; for (i =

20、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<->pj 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.Write("n:&

21、quot;); 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+) Con

22、sole.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(); 课本124上机实验6 class Student /学生类 int sno; /学号 string sname; /姓名 Course

23、 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 /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.Leng

24、th; for (int i = 0; i < course1.Length; i+) coursei = course1i; public void setscore(int score1) /设置分数 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

25、 = 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; else s = 0.0; sumgpa1 += coursei.pcredits * s; sumgpa2 += coursei.pcredits * scorei; sumc += coursei.pcredits; sgpa1 = sumgpa1 / s

26、umc; 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", coursei.pcname, coursei.pcredits, scorei); public voi

27、d 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; credits = xf; public string pcname /pcname属性，课程名可读可写 get return cname; set cname = v

28、alue; 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),new Course("课程4",6),new Course("课程

29、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 System.Collections.Generic;using System.Text;namespace Proj7_15 publ

30、ic 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 : Employee

31、 new public double compsalary() return 1.5 * psalary(); class Program static void Main(string args) 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(); 课本157页8public class Employee

32、/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; pub

33、lic 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 args) Employee emp1 = new Employee(); Console.WriteLine("该

34、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 private int no; /编号 private string name; /姓名 public void input() Con

35、sole.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",name); public class Student : Person /学生类 private string sclass; /班号 private in

36、t 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.WriteLine(" 班号:0",sclass); Console.WriteLine(" 成绩:0",d

37、egree); 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:"); depart = Console.ReadLine(); new public void disp() base.disp(); Console.Write

38、Line(" 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.d