C#学习课程

第一章 A B A B B B 第二章 D A B A B B 第三章 C A A D A D A 作业第二题代码 using System; namespace CSharp52Test { class MainClass { static void Main(string[] args) { int[] sourceAry = new int[5000000]; object[] targetAry = new object[5000000]; int[] targetAry1 = new int[5000000]; //初始化 for(int i=0;i<5000000;i++) { sourceAry[i] = i; } //执行5次 for (int j=0;j<5;j++) { Console.WriteLine("-----------------"); Console.WriteLine("装箱拆箱开始copy：" + DateTime.Now.ToString()); for(int i=0;i<5000000;i++) { targetAry[i] = sourceAry[i]; } for(int i=0;i<5000000;i++) { sourceAry[i] = (int)targetAry[i]; } Console.WriteLine("装箱拆箱结束：" + DateTime.Now.ToString()); Console.WriteLine("--------------------"); Console.WriteLine("不使用，开始：" + DateTime.Now.ToString()); for(int i=0;i<5000000;i++) { targetAry1[i] = sourceAry[i]; } for(int i=0;i<5000000;i++) { sourceAry[i] = targetAry1[i]; } Console.WriteLine("不使用，结束：" + DateTime.Now.ToString()); Console.WriteLine("-----------------"); } } } } 第四章 C B C D C A 作业第一题 using System; namespace CSharp52Test { class MainClass { void ComputerPower(int a,int b) { int c = 1; c = (int)Math.Pow((double)a,(double)b); // for(int i=0;i<b;i++) // { // c *= a; // } Console.WriteLine("{0}的{1}次幂为：{2}",a,b,c); } void ComputerPower(double a,int b) { double c = 1; c = Math.Pow(a,(double)b); // for(int i=0;i<b;i++) // { // c *= a; // } Console.WriteLine("{0}的{1}次幂为：{2}",a,b,c); } static void Main(string[] args) { MainClass m = new MainClass(); m.ComputerPower(2,4); m.ComputerPower(2.5,4); } } } 作业第二题 using System; using Microsoft.Win32; namespace CSharp52Test { class MainClass { static void Main(string[] args) { Microsoft.Win32.RegistryKey subKey; RegistryKey key = Registry.CurrentUser; subKey = key.OpenSubKey(@"Software\TAW\BSE"); string dsn = subKey.GetValue("DSN").ToString(); string user = subKey.GetValue("User").ToString(); string password = subKey.GetValue("Password").ToString(); string server = subKey.GetValue("Server").ToString(); string ip = subKey.GetValue("IP").ToString(); Console.WriteLine("DSN={0}\nUser={1}\nPassword={2}\nServer={3}\nIP={4}\n" ,dsn,user,password,server,ip ); } } } 第五章 D B　Ａ　Ａ　Ａ　Ａ 作业第一题 using System; namespace CSharp52Test { public abstract class Shape { private string _color; public string GetColor(string color) { _color = color; return _color; } public abstract double GetArea(int valuea); } //圆 public class Circle : Shape { private int _radius; public override double GetArea(int r) { _radius = r; double s; s = 3.14 * _radius * _radius; return s; } } //正方形 public class Square : Shape { private int _sideLen; public override double GetArea(int l) { _sideLen = l; double s; s = _sideLen * _sideLen; return s; } } } 第六章 Ｂ　Ｂ　Ｂ　Ｃ　Ａ　Ｂ using System; namespace CSharp52Test { public delegate void NotifyZero(); class EventClass { public event NotifyZero ZeroEntered; public void RaiseEvent() { if(ZeroEntered != null) ZeroEntered(); } } class Handlers { public static void Disp() { Console.WriteLine("除数不能为零。。。"); } } class MainClass { static void Main(string[] args) { int num1,num2; double result; EventClass objEventClass = new EventClass(); objEventClass.ZeroEntered += new NotifyZero(Handlers.Disp); Console.WriteLine("请输入第一个数"); num1 = int.Parse(Console.ReadLine()); Console.WriteLine("请输入第二个数"); num2 = int.Parse(Console.ReadLine()); if (num2 == 0) { objEventClass.RaiseEvent(); } else { result = (double)num1/num2; Console.WriteLine("除法的结果为:{0}",result); } } } }