C应用程序设计教程第二版课后习题答案.pdf

第一章 1.判断题 （1） (2) (3) (4) (5) (6) 2.选择题 （1）C (2) B (3) B (4) C (5) D (6) C 3.编程题 using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 class Program static void Main(string args) Console.WriteLine(“Hello C#“); 第二章 1.判断下列符号哪些是合法的C#变量名称 北京 abc _xyz x_y 2.根据要求写出C#表达式 （1） N%3=0 for (i = 2; i this.ClientSize.Height) D1 = 2; break; case 2: label1.Left -= 10; if (label1.Left 0) D1 = 3; break; case 3: label1.Top -= 10; if (label1.Top 0) D1 = 0; break; 2. 新建一个Windows窗口应用程序，按照运行效果图设计窗口 界面。其中的运算操作数输入和结果显示采用TextBox控件， 名称分别为textBox1、textBox2和textBox3；运算符选择采用 RadioButton控件，加减乘除分别为radioButton1到 radioButton4；“=”按钮采用Button控件，名称为button1，编写 button1的Click事件处理方法： private void button1_Click(object sender, EventArgs e) double v1, v2, v=0; v1 =double.Parse(textBox1.Text); v2 = double.Parse(textBox2.Text); if (radioButton1.Checked =true) v = v1 + v2; if (radioButton2.Checked =true) v = v1 - v2; if (radioButton3.Checked =true) v = v1 * v2; if (radioButton4.Checked =true) if (v2 != 0) v = v1 / v2; textBox3.Text = v.ToString(); 3.利用4.6节知识，参考图4-29设计具有菜单、工具栏和状态栏 的Windows窗口应用程序。 第五章 1.判断题 （1） (2) (3) (4) (5) (6) (7) 2.选择题 （1）A (2)无答案，应该是TextReader (3) A (4) C (5) A (6) C 3.编程题 创建Windows窗口用于程序，在窗口上放置一个Button控 件，名称为button1，编写其Click事件处理方法： private void button1_Click(object sender, EventArgs e) int i, j; int, a=new int3,3; int, b = new int3, 3; int, c = new int3, 3; string s1; string ss; FileStream fs = new FileStream(“d:data1.txt“,FileMode.Open ); StreamReader sr=new StreamReader (fs,Encoding.Default); StreamWriter sw; BinaryWriter bw; for (i = 0; i 3; i+) s1 = sr.ReadLine(); ss = s1.Split( ); for (j = 0; j 3; j+) ai, j = int.Parse(ssj); for (i = 0; i 3; i+) s1 = sr.ReadLine(); ss = s1.Split( ); for (j = 0; j 3; j+) bi, j = int.Parse(ssj); sr.Close(); fs.Close(); for (i = 0; i 3; i+) for (j = 0; j 3; j+) ci, j = ai, j + bi, j; SaveFileDialog sfd = new SaveFileDialog(); sfd.Filter = “文本文件(*.txt)|*.txt“; if (sfd.ShowDialog() = DialogResult.OK) fs = new FileStream(sfd.FileName, FileMode.OpenOrCreate); sw = new StreamWriter(fs,Encoding.Default); for (i = 0; i 3; i+) for (j = 0; j 3; j+) sw.Write(ci, j); sw.Write(“ “); sw.Write(“n“); sw.Close(); fs.Close(); sfd.Filter = “二进制文件(*.bin)|*.bin“; if (sfd.ShowDialog() = DialogResult.OK) fs = new FileStream(sfd.FileName, FileMode.OpenOrCreate); bw = new BinaryWriter(fs); for (i = 0; i 3; i+) for (j = 0; j 80“; com.Connection = con; OleDbDataReader dr = com.ExecuteReader(); comboBox1.Items.Clear(); while (dr.Read() = true) if (dr.IsDBNull(dr.GetOrdinal(“StudentID“) = false) comboBox1.Items.Add(dr“StudentID“); 说明：为了使用ADO.NET的OLEDB访问方式，需要添加下列 引用： using System.Data.OleDb; （2）界面与（1）相同。 编写button2的Click事件处理方法： private void button2_Click(object sender, EventArgs e) OleDbConnection con = new OleDbConnection(); OleDbCommand com = new OleDbCommand(); con.ConnectionString = “Provider=microsoft.jet.oledb.4.0;data source=d:aaa.mdb“; con.Open(); OleDbDataAdapter da = new OleDbDataAdapter(“select Class as 班级,avg(Score) as 平均成绩 fro