四川理工C#網(wǎng)絡(luò)編程(1—5章)答案

1、四川理工大學2012級計科四班 百年孤獨（匿名胖鳥） 提供第一章1如何確定最佳的斷行位置1. 表達式應完整清晰地體現(xiàn)其內(nèi)在的邏輯關(guān)系，因此一般選擇整個表達式中最高的關(guān)系層次進行斷行，比如“=“，”|”等，并將分隔符留在上一行；2. 當參數(shù)數(shù)量較多時，較長或含有表達式時，為了將邏輯體現(xiàn)得更為清晰，應將函數(shù)調(diào)用中的每個參數(shù)都分行書寫；3. 對于SQL語句或其他較長的復合語句，應將每個子句單獨寫成一行，便于理解。2九九乘法表using System;using System.Collections.Generici;using System.Linq;using System.Text;namesp

2、ace Homework class MulTable /乘法表類#region public void mulTablei() for (int ii = 1; i < 10; i+) for (int j = 1; j <= i; j+) String s = j + "x" + i + "=" + i * j; Console.Writiie(s.PadRighti(8); /使用PadRighti的作用是對齊 Console.WriteLine(); #endregion class Program /主類 static void M

3、ain(string args) MulTable m = new MulTable();/實例化一個對象m m.mulTable();/調(diào)用mulTable函數(shù)打印九九表 3關(guān)于類與對象的思考用我個人的話說，類就相當于一個模板，它不能直接使用，用模板造出來的東西就是對象，對象才可以被使用。第二章1注釋的用途1. 解釋代碼的意，用符合人類思維方式的描述性文字闡明代碼的功能和意圖；2. 對局部變量進行含義，取值范圍，單位等的說明；3. 充當代碼標題，便于掌握代碼總體結(jié)構(gòu)，快速定位錯誤，闡明分支與循環(huán)控制結(jié)構(gòu)；4. 指出例外情況，為達到特殊效果有意為之，并對其說明原由。2復數(shù)類Complexusi

4、ng System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Homework / <summary> / Complex 實現(xiàn)復數(shù)的加減功能 / </summary> class Complex/一個簡單的復數(shù)類 / <summary> / real 為實數(shù)的實部 / image 為實數(shù)的虛部 / </summary> private Int32 real; private Int32 image; / <summary&g

5、t; / 初始化Homework.Complex的新實例 / </summary> public Complex()/無參構(gòu)造函數(shù) this.real = 0; this.image = 0; / <summary> / 使用指定的參數(shù)列表初始化Homework.Complex的新實例 / </summary> / <param name="r">形參實部</param> / <param name="i">形參虛部</param> public Complex(int

6、r, int i)/帶參構(gòu)造函數(shù) this.real = r; this.image = i; / <summary> / Add實現(xiàn)兩個復數(shù)相加的功能 / </summary> / <param name="com">類型為Complex的形參</param> / <returns>返回一個a+bi形式的字符串</returns> public String Add(Complex com)/復數(shù)加法方法 Int32 addReal = this.real + com.real;/addReal為實部

7、相加結(jié)果 Int32 addImage = this.image + com.image;/addImage為虛部相加結(jié)果 if (0 != addReal && 0 > addImage)/實部不為0，虛部小于0，結(jié)果形如：2 - 5i return addReal.ToString() + addImage.ToString() + "i" else if (0 = addReal && 0 != addImage)/實部為0，虛部不為0，結(jié)果形如：5i return addImage.ToString() + "i&qu

8、ot; else if (0 != addReal && 0 = addImage)/實部不為0，虛部為0，結(jié)果形如：2 return addReal.ToString(); else if (0 = addReal && 0 = addImage)/實部虛部都為0，即結(jié)果為：0 return "0" else/實部不為0，虛部大于0，結(jié)果形如：2+5i return addReal.ToString()+ "+" + addImage.ToString() + "i" / <summary>

9、; / Sub實現(xiàn)復數(shù)相減的功能 / </summary> / <param name="com">類型為Complex的形參</param> / <returns>返回一個形如a+bi的字符串</returns> public String Sub(Complex com)/復數(shù)減法方法 Int32 subReal = this.real - com.real;/subReal為實部相減結(jié)果 Int32 subImage = this.image - com.image;/subImage為虛部相減結(jié)果 if (

10、0 != subReal && 0 > subImage)/實部不為0，虛部小于0，結(jié)果形如：2 - 5i return subReal.ToString() + subImage.ToString() + "i" else if (0 = subReal && 0 != subImage)/ 實部為0，虛部不為0，結(jié)果形如：5i return subImage.ToString() + "i" else if (0 != subReal && 0 = subImage)/ 實部不為0，虛部為0，結(jié)果

11、形如：2 return subReal.ToString(); else if (0 = subReal && 0 = subImage)/ 實部虛部都為0，即結(jié)果為：0 return "0" else/實部不為0，虛部大于0，結(jié)果形如：2+5i return subReal.ToString() + "+" + subImage.ToString() + "i" class Program/主函數(shù)類 static void Main(string args) /實例化兩個對象c1，c2 Complex c1 = ne

12、w Complex(1, 2); Complex c2 = new Complex(2, -2); /輸出兩個復數(shù)相互加減的結(jié)果 Console.WriteLine(c1.Add(c2); Console.WriteLine(c1.Sub(c2); Console.WriteLine(c2.Add(c1); Console.WriteLine(c2.Sub(c1); 3圓類Circleusing System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Homework / <

13、;summary> / 提供計算圓周長和面積的功能 / </summary> class Circle / <summary> / radius為圓的半徑 / </summary> private double radius; / <summary> / 初始化Homework.Circle的新實例 / </summary> public Circle() this.radius = 0; / <summary> / 用指定的參數(shù)列表初始化Homework.Circle的新實例 / </summary>

14、/ <param name="r">形參為圓的半徑，double類型</param> public Circle(double r) this.radius = r; / <summary> / 實現(xiàn)計算圓周長的功能 / </summary> / <returns>返回圓的周長，類型為double</returns> public double Girth() return Math.PI * this.radius * 2; / <summary> / 實現(xiàn)計算圓面積的功能 / </

15、summary> / <returns>返回圓的面積，類型為double</returns> public double Ariea() return Math.PI * this.radius * this.radius; class Program/主函數(shù)類 static void Main(string args) Circle c = new Circle(10);/實例化一個對象c Console.WriteLine(c.Girth();/輸出圓c的周長 Console.WriteLine(c.Area();/輸出圓c的面積 第三章1字符使用規(guī)則1. 所

16、有的標識符只能由字母，數(shù)字，下劃線組成，且第一個字符不能為數(shù)字，下劃線主要用于分隔汗多個單詞的常量；2. 標識符中不能包含空格，標點符號，運算符等其他符號；3. 標識符區(qū)分大小寫；4. 利用英語單詞的組合命名，做到一目了然；5. 標識符不能與C#的關(guān)鍵字相同；6. 標識符盡量不與C#中類庫名相同。2Pascal與Camel規(guī)則的區(qū)別，何時采用Camel1. Pascal: 標識符中每個單詞的首字母大寫，其余小寫；Camel: 標識符的第一個單詞的首字母小寫，其余每個單詞首字母大寫，剩余小寫2. 外部程序不可見的“私有及受保護的字段”，“局部變量”，“函數(shù)參數(shù)”使用Camel規(guī)則。3創(chuàng)建一個Wi

17、ndows工程，實現(xiàn)登錄界面。namespace HomeworkWinForm partial class FormLogin / <summary> / 必要的設(shè)計器變量 / </summary> private System.ComponentModel.IContainer components = null; / <summary> / 清理所有正在使用的資源 / </summary> / <param name="disposing">如果應釋放托管資源，為 true；否則為false</para

18、m> protected override void Dispose(bool disposing) if (disposing && (components != null) components.Dispose(); base.Dispose(disposing); #region Windows 窗體設(shè)計器生成的代碼 / <summary> / 設(shè)計器支持所需的方法 不要 / 使用代碼編輯器修改修此方法的內(nèi)容。 / </summary> private void InitializeComponent() this.labelUser = n

19、ew System.Windows.Forms.Label(); this.labelPassword = new System.Windows.Forms.Label(); this.textBoxUser = new System.Windows.Forms.TextBox(); this.textBoxPassword = new System.Windows.Forms.TextBox(); this.buttonSignIn = new System.Windows.Forms.Button(); this.buttonCancle = new System.Windows.Form

20、s.Button(); this.labelPassword2 = new System.Windows.Forms.Label(); this.textBoxPassword2 = new System.Windows.Forms.TextBox(); this.SuspendLayout(); / / labelUser / this.labelUser.AutoSize = true; this.labelUser.Location = new System.Drawing.Point(30, 26); this.labelUser.Name = "labelUser"

21、; this.labelUser.Size = new System.Drawing.Size(67, 15); this.labelUser.TabIndex = 0; this.labelUser.Text = "用戶名：" / / textBoxUser / this.textBoxUser.Locationi = new System.Drawing.Point(107, 23); this.textBoxUser.MaxLength = 20; this.textBoxUser.Name = "textBoxUser" this.textBox

22、User.Size = new System.Drawing.Size(159, 25); this.textBoxUser.TabIndex = 2; / / labelPassword / this.labelPassword.AutoSize = true; this.labelPassword.Location = new System.Drawing.Point(30, 67); this.labelPassword.Name = "labelPassword" this.labelPassword.Size = new System.Drawing.Size(6

23、7, 15); this.labelPassword.TabIndex = 1; this.labelPassword.Text = "密碼：" / / textBoxPassword / this.textBoxPassword.Location = new System.Drawing.Point(107, 64); this.textBoxPassword.MaxLength = 18; this.textBoxPassword.Name = "textBoxPassword" this.textBoxPassword.PasswordChar =

24、 '#' this.textBoxPassword.Size = new System.Drawing.Size(159, 25); this.textBoxPassword.TabIndex = 3; / / labelPassword2 / this.labelPassword2.AutoSize = true; this.labelPassword2.Location = new System.Drawing.Point(30, 103); this.labelPassword2.Name = "labelPassword2" this.labelPa

25、ssword2.Size = new System.Drawing.Size(82, 15); this.labelPassword2.TabIndex = 6; this.labelPassword2.Text = "確認密碼：" / / textBoxPassword2 / this.textBoxPassword2.Location = new System.Drawing.Point(107, 100); this.textBoxPassword2.MaxLength = 18; this.textBoxPassword2.Name = "textBoxP

26、assword2" this.textBoxPassword2.PasswordChar = '#' this.textBoxPassword2.Size = new System.Drawing.Size(159, 25); this.textBoxPassword2.TabIndex = 7; / / buttonSignIn / this.buttonSignIn.Location = new System.Drawing.Point(52, 150); this.buttonSignIn.Name = "buttonSignIn" this

27、.buttonSignIn.Size = new System.Drawing.Size(75, 33); this.buttonSignIn.TabIndex = 4; this.buttonSignIn.Text = "注冊" this.buttonSignIn.UseVisualStyleBackColor = true; this.buttonSignIn.Click += new System.EventHandler(this.buttonLogin_Click); / / buttonCancle / this.buttonCancle.Location =

28、new System.Drawing.Point(179, 150); this.buttonCancle.Name = "buttonCancle" this.buttonCancle.Size = new System.Drawing.Size(75, 33); this.buttonCancle.TabIndex = 5; this.buttonCancle.Text = "取消" this.buttonCancle.UseVisualStyleBackColor = true; this.buttonCancle.Click += new Sys

29、tem.EventHandler(this.buttonCancle_Click); / / FormLogin / this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSizei = new System.Drawing.Size(316, 209); this.Controls.Add(this.textBoxPassword2); this.Controls.Add(thi

30、s.labelPassword2); this.Controls.Add(this.buttonCancle); this.Controls.Add(this.buttonSignIn); this.Controls.Add(this.textBoxPassword); this.Controls.Add(this.textBoxUser); this.Controls.Add(this.labelPassword); this.Controls.Add(this.labelUser); this.MaximizeBox = false; this.MinimizeBox = false; t

31、his.Name = "FormLogin" this.ShowIcon = false; this.ShowInTaskbar = false; this.Text = "注冊界面" this.Load += new System.EventHandler(this.FormLogin_Load); this.ResumeLayout(false); this.PerformLayout(); #endregion private System.Windows.Forms.Label labelUser; private System.Windows.

32、Forms.TextBox textBoxUser; private System.Windows.Forms.Label labelPassword; private System.Windows.Forms.Label labelPassword2; private System.Windows.Forms.TextBox textBoxPassword2; private System.Windows.Forms.TextBox textBoxPassword; private System.Windows.Forms.Button buttonSignIn; private Syste

33、m.Windows.Forms.Button buttonCancle; 第四章1. 判斷double型的d1是否等于3.14的表達式if (Math.Abs(d1 - 3.14) < 0.001) Console.WriteLine("d1等于3.14"); else Console.WriteLine("d1不等于3.14");2. 枚舉問題枚舉元素值原則上是可以相同的，但是應避免不同枚舉元素使用相同的枚舉值，以免程序運行產(chǎn)生歧義而出錯導致得不到理想運行結(jié)果。3. 表達式不宜復雜化的原因代碼開發(fā)講究的效率，而且基本都是團隊開發(fā)，如果代碼太過復雜

34、就會導致團隊人員花大量時間來讀懂代碼的意思，從而阻礙到開發(fā)的進度；另外在維護代碼的時候也會耗費大量時間，浪費人力物力；因此好的代碼應清晰易懂。第五章1. 用if 和 switch 語句寫出分制轉(zhuǎn)換代碼void Score2Grade(float score)/if語句實現(xiàn)等級轉(zhuǎn)換 if (score >= 90 && score <= 100) Console.WriteLine("優(yōu)秀"); else if (score >= 80) Console.WriteLine("良好"); else if (score &g

35、t;= 70) Console.WriteLine("中等"); else if (score >= 60) Console.WriteLine("及格"); else Console.WriteLine("不及格"); void Score_Grade(float score)/switch實現(xiàn)等級轉(zhuǎn)換 int i = (int)score/10; switch(i) case 10: case 9: Console.WriteLine("優(yōu)秀"); break; case 8: Console.WriteLine("良好"); brea