Copy a class

Posted on February 11, 2011June 27, 2015 by coder


   
 
/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Copy a class. 
 
using System; 
 
// Define a structure. 
class MyClass { 
  public int x; 
} 
 
// Now show a class object assignment. 
public class ClassAssignment { 
  public static void Main() { 
    MyClass a = new MyClass(); 
    MyClass b = new MyClass(); 
 
    a.x = 10; 
    b.x = 20; 
 
    Console.WriteLine("a.x {0}, b.x {1}", a.x, b.x); 
 
    a = b; 
    b.x = 30; 
 
    Console.WriteLine("a.x {0}, b.x {1}", a.x, b.x); 
  } 
}

declare a class Address containing the data members to describe a US address along with the member functions

Posted on February 11, 2011June 27, 2015 by coder

   
 


using System;

class MainClass {
    public static void Main(string[] args) {
        Address addr = new Address();
        addr.SetStreet(123, "My Street");
        addr.SetCity("A", "X", 123456);

        Console.WriteLine(addr.GetStreetString());
        Console.WriteLine(addr.GetCityString());

        addr.Output();

    }
}

class Address {
    public int nAddressNumberPart;
    public string sAddressNamePart;

    public string sCity;
    public string sState;
    public int nPostalCode;

    public void SetStreet(int nNumber, string sName) {
        nAddressNumberPart = nNumber;
        sAddressNamePart = sName;
    }

    public string GetStreetString() {
        return nAddressNumberPart + " " + sAddressNamePart;

    }
    public void SetCity(string sCityIn, string sStateIn, int nPostalCodeIn) {
        sCity = sCityIn;
        sState = sStateIn;
        nPostalCode = nPostalCodeIn;
    }
    public string GetCityString() {
        return sCity + ", " + sState + " " + nPostalCode;
    }
    public string GetAddressString() {
        return GetStreetString() + "
" + GetCityString();
    }

    public void Output() {
        Console.WriteLine(GetAddressString());
    }
}

Static class variable

Posted on February 11, 2011June 27, 2015 by coder


   

/*
Learning C# 
by Jesse Liberty

Publisher: O&#039;Reilly 
ISBN: 0596003765
*/
 using System;

 namespace Test_Console_App_3
 {

     // declare a Cat class
     // stripped down
     class Cat
     {
         // a private static member to keep
         // track of how many Cat objects have
         // been created
         private static int instances = 0;
         private int weight;
         private String name;

         // cat constructor
         // increments the count of Cats
         public Cat(String name, int weight)
         {
             instances++;
             this.name = name;
             this.weight = weight;
         }

         // Static method to retrieve
         // the current number of Cats
         public static void HowManyCats()
         {
             Console.WriteLine("{0} cats adopted",
                 instances);
         }
         public void TellWeight()
         {
             Console.WriteLine("{0} is {1} pounds",
                 name, weight);
         }
     }

    public class StaticInClassTester
    {
       public void Run()
       {
           Cat.HowManyCats();
           Cat frisky = new Cat("Frisky", 5);
           frisky.TellWeight();
           Cat.HowManyCats();
           Cat whiskers = new Cat("Whisky", 7);
           whiskers.TellWeight();
           Cat.HowManyCats();
       }

       static void Main()
       {
          StaticInClassTester t = new StaticInClassTester();
          t.Run();
       }
    }
 }

Class variables with default value

Posted on February 11, 2011June 27, 2015 by coder


   

/*
Learning C# 
by Jesse Liberty

Publisher: O&#039;Reilly 
ISBN: 0596003765
*/
 using System;

 public class MyTimeWithDefaultValue
 {
     // private member variables
     int year;
     int month;
     int date;
     int hour;
     int minute;
     int second = 30;

     // public method
     public void DisplayCurrentMyTimeWithDefaultValue()
     {
         System.Console.WriteLine("{0}/{1}/{2} {3}:{4}:{5}",
             month, date, year, hour, minute, second);
     }

     // constructor
     public MyTimeWithDefaultValue(int theYear, int theMonth, int theDate,
         int theHour, int theMinute)
     {
         year = theYear;
         month = theMonth;
         date = theDate;
         hour = theHour;
         minute = theMinute;
     }
 }

 public class Tester
 {
     static void Main()
     {
         MyTimeWithDefaultValue timeObject = new MyTimeWithDefaultValue(2005,3,25,9,35);
         timeObject.DisplayCurrentMyTimeWithDefaultValue();
     }
 }

A Simple Class and Objects

Posted on February 11, 2011June 27, 2015 by coder

   
 


public class Product {
    public string make;
    public string model;
    public string color;
    public int yearBuilt;

    public void Start() {
        System.Console.WriteLine(model + " started");
    }

    public void Stop() {
        System.Console.WriteLine(model + " stopped");
    }

}


class MainClass{

    public static void Main() {
        Product myProduct;

        myProduct = new Product();

        myProduct.make = "Toyota";
        myProduct.model = "MR2";
        myProduct.color = "black";
        myProduct.yearBuilt = 1995;

        System.Console.WriteLine("myProduct details:");
        System.Console.WriteLine("myProduct.make = " + myProduct.make);
        System.Console.WriteLine("myProduct.model = " + myProduct.model);
        System.Console.WriteLine("myProduct.color = " + myProduct.color);
        System.Console.WriteLine("myProduct.yearBuilt = " + myProduct.yearBuilt);

        myProduct.Start();
        myProduct.Stop();

        Product redPorsche = new Product();
        redPorsche.make = "Porsche";
        redPorsche.model = "Boxster";
        redPorsche.color = "red";
        redPorsche.yearBuilt = 2000;
        System.Console.WriteLine(          "redPorsche is a " + redPorsche.model);
        System.Console.WriteLine("Assigning redPorsche to myProduct");
        myProduct = redPorsche;
        System.Console.WriteLine("myProduct details:");
        System.Console.WriteLine("myProduct.make = " + myProduct.make);
        System.Console.WriteLine("myProduct.model = " + myProduct.model);
        System.Console.WriteLine("myProduct.color = " + myProduct.color);
        System.Console.WriteLine("myProduct.yearBuilt = " + myProduct.yearBuilt);
    }
}

Field Attributes

Posted on February 11, 2011June 27, 2015 by coder

   
 

using System;
using System.Reflection;

public enum RegHives {
    HKEY_CLASSES_ROOT,
    HKEY_CURRENT_USER,
    HKEY_LOCAL_MACHINE,
    HKEY_USERS,
    HKEY_CURRENT_CONFIG
}

public class RegKeyAttribute : Attribute {
    public RegKeyAttribute(RegHives Hive, String ValueName) {
        this.Hive = Hive;
        this.ValueName = ValueName;
    }

    protected RegHives hive;
    public RegHives Hive {
        get { return hive; }
        set { hive = value; }
    }

    protected String valueName;
    public String ValueName {
        get { return valueName; }
        set { valueName = value; }
    }
}

class SomeClass {
    [RegKey(RegHives.HKEY_CURRENT_USER, "Foo")]
    public int Foo;

    public int Bar;
}

class Test {
    [STAThread]
    static void Main(string[] args) {
        Type type = Type.GetType("FieldAttribs.SomeClass");
        foreach (FieldInfo field in type.GetFields()) {
            foreach (Attribute attr in
                field.GetCustomAttributes(true)) {
                RegKeyAttribute rka =
                    attr as RegKeyAttribute;
                if (null != rka) {
                    Console.WriteLine("{0} will be saved in {1}{2}", field.Name, rka.Hive, rka.ValueName);
                }
            }
        }
    }
}

The super-string class.

Posted on February 11, 2011June 27, 2015 by coder

using System;

public class MyString {
private string fString;

public MyString() {
fString = “”;
}
public MyString(string inStr) {
fString = inStr;
}
public string ToStr() {
return fString;
}
public string Right(int nChars) {
if (nChars > fString.Length)
return fString;

string s = “”;
for (int i = fString.Length – nChars; i < fString.Length; ++i) s += fString[i]; return s; } public string Left(int nChars) { if (nChars > fString.Length)
return fString;
string s = “”;
for (int i = 0; i < nChars; ++i) s += fString[i]; return s; } public string Mid(int nStart, int nEnd) { if (nStart < 0 || nEnd > fString.Length)
return fString;
if (nStart > nEnd)
return “”;

string s = “”;
for (int i = nStart; i < nEnd; ++i) s += fString[i]; return s; } } class Class1 { static void Main(string[] args) { MyString s = new MyString("Hello world"); System.Console.WriteLine("s = {0}", s.ToStr()); System.Console.WriteLine("Right 3 = [{0}]", s.Right(3)); System.Console.WriteLine("Left 6 = [{0}]", s.Left(6)); System.Console.WriteLine("Mid 2,4 = [{0}]", s.Mid(2, 4)); } } [/csharp]

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