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  • C#练习4

    //错误的程序
    using
    System; class Test { unsafe static void WriteLocations(byte[]arr) { fixed(byte*p_arr=arr) { byte* p_elem = p_arr; for(int i=0;i<arr.Length;i++) byte value=*p_elem; string addr=int.Format((int)p_elem,"x"); Console.WriteLine("arr[{0}]at0x{1}is{2}",i,addr,value); p_elem++; } } } static void Main() { byte[]Array=new byte[]{1,2,3,4,5}; WriteLocations(arr); }
    static void Main()
    {
    F();
    G();
    {
    H();
    I();
    }
    }
    
    static void Main(String[]args)
    {
    if(args.Length==0)
    goto done;
    Console.WriteLine(args.Length);
    done:
    Console.WriteLine("Done");
    }
    
    static void Main()
    {
    const float pi=3.14;
    const int r=123;
    Console.WriteLine(pi*i*i);
    }
    
    static void Main()
    {
    int a;
    int b=2,c=3;
    a=1;
    Console.WriteLine(a+b+c);
    }
    
    static int F
    using System;
    class MyClass
    {
        public MyClass()
        {
            Console.WriteLine("Constructor");
        }
        public MyClass(int value)
        {
            MyField = value;
            Console.WriteLine("Destructor");
        }
        ~MyClass()
        {
            Console.WriteLine("Destructor");
        }
        public const int MyConst = 12;
        public int MyField = 34;
        public void MyMethod()
        {
            Console.WriteLine("MyClass.MyMethod");
        }
        public int Myproperty()
        {
            get{
                return MyField;
            }
            set{
                MyField=value;
            }
        }
        public int this[int index]{
            get
            {
                return 0;
            }
            set
            {
                Console.WriteLine("this[{0}]{1}", index, value);
            }
        }
        public event EventHandler MyEvent;
        public static MyClass operator+(MyClass a,MyClass b)
        {
            return new MyClass(a.MyField + b.MyField);
        }
        internal class MyNestedClass { }
       
    }
    
    class Constans
    {
        public const int A = 1;
        public const int B = A + 1;
    }
    
    class Test
    {
        static void Main()
        {
            Console.WriteLine("{0},{1}", Constans.A, Constans.B);
        }
    }
    
    //Fields
    class Color
    {
        internal ushort redpart;
        internal ushort bluepart;
        internal ushort greenpart;
        public Color(ushort red,ushort blue,ushort green)
        {
            redpart = red;
            bluepart = blue;
            greenpart = green;
        }
    }
    
    class Color
    {
        public static Color Red = new Color(0XFF, 0, 0);
        public static Color Blue = new Color(0, 0XFF, 0);
        public static Color Green = new Color(0, 0, 0XFF);
        public static Color While = new Color(0, 0, 0);
    }
    using System;
    class Point
    {
        public double x, y;
        public Point(){
        this.x=0;
        this.y=0;
    }
    public Point(double x,double y)
        {
            this.x = x;
            this.y = y;
        }
        public static double Distance(Point a,Point b)
    {
        double xdiff = a.x - b.x;
        double ydiff = a.y - b.y;
        return Math.Sqrt(xdiff * xdiff + ydiff * ydiff);
    }
        public override string ToString()
        {
            return string.Format("{0},{1}",x,y);
        }
    }
    class Test
    {
        static void Main()
        {
            Point a = new Point();
            Point b = new Point(3, 4);
            double d = Point.Distance(a, b);
            Console.WriteLine("Distance from {0} to {1} is {2}", a, b, d);
        }
    }
    using System;
    class Point
    {
        public double x, y;
        public Point(double x, double y) {
            this.x = x;
            this.y = y; 
        }
        ~Point()
        {
            Console.WriteLine("Destructed {0}", this);
        }
        public override string ToString()
        {
            return string.Format("{0},{1}",x,y);
        }
    }
    using System;
    class Test
    {
        static void Main()
        {
            Type type = typedef(Class1);
            object[] arr = type.GetCustomAttributes(typeof(HelpAttribute));
            if (arr.Length == 0)
                Console.WriteLine("Class1 has no Help attribute.");
            else
            {
                HelpAttribute ha = (HelpAttribute)arr[0];
                Console.WriteLine("Ur1={0},Topic={1}", ha.Ur1, ha.Topic);
            }
        }
    }
    using System;
    class Test
    {
        static void Main()
        {
            Type type = typedef(Class1);
            object[] arr = type.GetCustomAttributes(typeof(HelpAttribute));
            if (arr.Length == 0)
                Console.WriteLine("Class1 has no Help attribute.");
            else
            {
                HelpAttribute ha = (HelpAttribute)arr[0];
                Console.WriteLine("Ur1={0},Topic={1}", ha.Ur1, ha.Topic);
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/zhangyongjian/p/3580145.html
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