C#课后参考答案.docx

1、C#课后参考答案C#教程习题参考答案第一章(1) .NET Framework是平台，Visual Studio.NET是集成开发环境，C#是一种.NET平台下的开发语言(2) 易于掌握、支持跨平台、面向对象、与XML相融合(3) 组织资源、避免命名冲突(4) (5) 第二章上机练习(1) 输出结果为：(2) . (3) 使用Checked运算符可以抛出运算异常(4) Result:5050(5) 程序为：/*using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1

2、 class Program static void Main(string args) string str = Console.ReadLine(); char ch = str.ToCharArray(); /字符串转换为字符数组 /输出转换结果 foreach(char c in ch) Console.WriteLine(0,c); /实现反转 char chtemp = str.ToCharArray(); int longs = ch.GetLength(0); for(int i = 0 ; i = longs-1 ; i+) chtempi = chlongs-i-1; /

3、/使用修改后的字符数组构造新字符串 string str2 = new string(chtemp); Console.WriteLine(str2); Console.ReadLine(); /*习题1、选择题(1) BD (2) D (3) ADE (4)ABC (5)ABD 2、填空题(1) -123 (2) delegate (3) 装箱 (4) n (5)堆内存 (6) 隐式转换和显式转换(7) ToCharArray(8) 编译错误：运算符“&”无法应用于“int”和“bool”类型的操作数； True；(9) ()3、简答题(1) 数据存放的位置与使用方式不同。(2) 装箱的过程

4、首先创建一个引用类型的实例，然后将值类型变量的内容复制给该引用类型实例.(3) 变量名必须以字母开头； 变量名只能由字母、数字和下划线组成，而不能包含空格、标点符号、运算符等其他符号； 变量名不能与C#中的关键字名称相同； 变量名不能与C#的库函数名称相同。(4) 小数类型较浮点类型而言，具有更大的精确度，但是数值范围相对小了很多。将浮点类型的数向小数类型的数转化时会产生溢出错误，将小数类型的数向浮点类型的数转化时会造成精确度的损失。因此，两种类型不存在隐式或显式转换。(5) 在需要实例化出一个引用类型的对象时使用。第三章上机练习(1) .(2) 六行杨辉三角(3) 五行杨辉三角(4) usi

5、ng System;class Test public static int max(int a, int b, int c, int d) int tempmax = a; if (tempmax b) tempmax = b; if (tempmax c) tempmax = c; if (tempmax b) tempmin = b; if (tempmin c) tempmin = c; if (tempmin d) tempmin = d; return tempmin; public static void Main() Console.WriteLine(Please input

6、 four number:); int x1 = Convert.ToInt32(Console.ReadLine(); int x2 = Convert.ToInt32(Console.ReadLine(); int x3 = Convert.ToInt32(Console.ReadLine(); int x4 = Convert.ToInt32(Console.ReadLine(); Console.WriteLine(The Max Number is :0, max(x1, x2, x3, x4); Console.WriteLine(The Min Number is :0, min

7、(x1, x2, x3, x4); Console.ReadLine(); (5) using System;class Test public static int addfor() int sum = 0; for(int i = 0 ; i = 50 ; i+ ) sum += i; return sum; public static int adddo() int sum = 0; int i = 0; do sum += i; i+; while (i = 50); return sum; public static int addwhile() int sum = 0; int i

8、 = 0; while (i = 50) sum += i; i+; return sum; public static void Main() Console.WriteLine(The Sum for is:0,addwhile(); Console.WriteLine(The Sum do is:0, addwhile(); Console.WriteLine(The Sum while is:0, addwhile(); Console.ReadLine(); 习题1、选择题(1) B (2) ACD (3) D (4) D (5) A 2、填空题(1) 顺序、分支、循环(2) bre

9、ak;reuturn;goto;continue(3) 3(4) 集合中元素的类型(5) 在C#语句和表达式的处理过程中激发了某个异常的条件，使得操作无法正常结束，引发异常、抛出异常3、简答题(1) 判断表达式一定要合法(2) 计算表达式的值；与分支进行匹配；执行分支语句；结束。(3) 提高程序的可读性和健壮性(4) Try块的代码是程序中可能出现错误的操作部分。Catch块的代码是用来处理各种错误的部分（可以有多个）。必须正确排列捕获异常的catch子句,范围小的Exception放在前面的catch。即如果Exception之间存在继承关系，就应把子类的Exception放在前面的catc

10、h子句中。Finally块的代码用来清理资源或执行要在try块末尾执行的其他操作（可以省略）。且无论是否产生异常，Finally块都会执行第四章上机练习(1) (2) using System;class MainClass public static void Main(string args) int sum = 0; int, , Score = 1, 2 , 3, 4 , 5,6 , 7,8 ; for (int i = 0; i 2; i+) for (int j = 0; j 2; j+) for (int k = 0; k 2; k+) sum += Scorei, j, k;

11、Console.WriteLine(The sum is ：0, sum); Console.ReadLine(); (3)using System;class MainClass public static void Main(string args) int, arr = new int3, 3; int i, j, t, m=0, k=0, flag = 0; for(i = 0 ; i 3 ; i +) for(j=0 ; j 3 ; j +) arri,j = Convert.ToInt32(Console.ReadLine(); /* 求出每一行的最大值,并判断它是否为所在列的最小

12、值 */ for(i=0;i3;i+) t=arri,0; for(j=0;j3;j+) if(t=arri,j) t=arri,j; m=i; k=j; for(i=0;iarri,k) flag=1; /* 鞍点存在，查找是否有多个鞍点 */ if(flag=0) /* 找出鞍点个数并打印出来 */ for(j=0;j3;j+) if(arrm,j=arrm,k) /printf(the saddle point a%d%d= %dn,m,j,amj); Console.WriteLine(The saddle point a01=2n,m,j,arrm,j); else Console.

13、WriteLine(there are no saddle point); Console.ReadLine(); (4) using System;class MainClass public static void Main(string args) int, arr = new int3, 3; int sum = 0; for (int i = 0; i 3; i+) for (int j = 0; j 0) ai = b % 2; b /= 2; i+; j+; Console.WriteLine(The result is :); for (k = j - 1; k = 0; k-

14、) Console.WriteLine(0, ak); Console.ReadLine(); (6) using System;using System.Collections;using System.Collections.Generic;class friend string name=; string telephone=; string group=; public string Name get return name; set name = value; public string Telephone get return telephone; set telephone =

15、value; public string Group get return group; set group = value; public friend(string n,string t,string g) name = n; telephone = t; group = g; public friend(string n) name = n; telephone = ; group = ; public void Display() Console.WriteLine(-); Console.WriteLine(姓名：0n,this.Name); Console.WriteLine(电话

16、：0n,this.telephone); Console.WriteLine(组：0n,this.group); class telephonebook private ArrayList tele; public telephonebook() this.tele = new ArrayList(); public void Add(friend f) this.tele.Add(f); public void Delete(string na) friend temp=null; foreach (friend f in this.tele) if (friend)f).Name = na

17、) temp = f; if(temp != null) this.tele.Remove(temp); public void Edit(string na) string name, tele, group; Console.WriteLine(请输入修改后的名称：); name = Console.ReadLine(); Console.WriteLine(请输入修改后的电话：); tele = Console.ReadLine(); Console.WriteLine(请输入修改后的组：); group = Console.ReadLine(); this.Delete(na); fr

18、iend temp = new friend(name, tele, group); this.tele.Add(temp); public friend SearchByName(string na) foreach (friend f in this.tele) if (f.Name = na) return f; return null; public friend SearchByTele(string tel) foreach (friend f in this.tele) if (f.Telephone = tel) return f; return null; public vo

19、id display() foreach (friend f in this.tele) f.Display(); class MainClass public static void Main(string args) telephonebook tb = new telephonebook(); friend zangsan = new friend(zs, 123, jiaren); zangsan.Display(); tb.Add(zangsan); friend temp = tb.SearchByTele(123); if (temp != null) temp.Display(

20、); else Console.WriteLine(查无此人！); tb.display(); Console.ReadLine(); 习题1、选择题(1) D (2) C (3) A (4) ABC (5) C2、填空题(1) Sort() (2) 抛出异常、集合已修改；可能无法执行枚举操作。(3) 获取头部元素数据(4) Peek方法仅获取栈顶元素数据，Pop方法删除栈顶元素(5) 实现System.IEnumerable接口或实现集合模式(6) 名值对(7) SortedList中的Key数组排好序的第五章上机练习(1) (2) class student public string n

21、ame; private int age; private int heigh; private string grade; public student() this.name = ; this.age = 18; this.heigh = 180; this.grade = 0604; public student(string na, int a, int h, string g) this.grade = g; this.name = na; this.heigh = h; this.age = a; student() (3)using System;using System.Col

22、lections.Generic;class Employee private string name; private string ID; public static float TotalSalary; /定义实例构造函数，用来初始化实例中成员 public Employee() this.name = ; this.price = 0000; public Employee(string n,string i) this.name = n; this.ID = i; /定义静态构造函数 static Employee() TotalSalary = 0; /定义析构函数 Employe

23、e() public void printName() Console.WriteLine(this.name); (4)using System;using System.Collections.Generic;class Employee private string name; private string ID; public static float TotalSalary; private float Salary; /定义实例构造函数，用来初始化实例中成员 public Employee() this.name = ; this.ID = 0000; this.Salary =

24、0; public Employee(string n,string i,float s) this.name = n; this.ID = i; this.Salary =s; TotalSalary += this.Salary; /定义静态构造函数 static Employee() TotalSalary = 0; /定义析构函数 Employee() public void printName() Console.WriteLine(this.name); public static void DisplayTotalSalary() Console.WriteLine(总薪水为：0

25、,TotalSalary); (5) using System;using System.Collections.Generic;class Account private string ID; private string PSW; private string Name; private float Balance; public static float TotalBalance; /定义实例构造函数，用来初始化实例中成员 public Account(string i, string p, string n, float b) this.Balance = b; this.ID = i; this.Name = n; this.PSW = p; TotalBalance += this.Balance; s