C# week5_3

1. this
   
2. Method overloading
   
3. 
   
   inheritance
   
   
   
   
4. 
   
   this
   
   class xyz
   
   
   {
   
   public int id;
   
   xyz ()
   
   {
   
   this.id=id; (Access class valuable)
   
   }
   
   }
   
   
    
5. 
   
   Method overloading
   
   Def. If 2 Methods in a class has a same name, but they have different number of parameter (augment) or same number of parameter but different is their data type called "over load Method".
   
   
    
   If 2 methods in a class define with the same name, same number of parameter, same type of parameter, but have different return data type, they will not be overloaded.
   
   = error (It is required same order.)
   
   
    
   namespace ConsoleApplication4
   
   {
   
   class abc
   
   {
   
   static void Main(string[] arg)
   
   {
   
   Test t = new Test();
   
   Test t1 = new Test(3);
   
   Test t2 = new Test(3.3);
   
   }
   
   }
   
   class Test
   
   {
   
   public Test()
   
   {
   
   Console.WriteLine("Without parameter");
   
   }
   
   
    
   public Test(int i)
   
   {
   
   Console.WriteLine("one int parameter");
   
   }
   
   
    
   public Test(double k)
   
   {
   
   Console.WriteLine("one double parameter");
   
   }
   
   }
   
   }
   
   
    
   Result
   
   Without parameter
   
   one into parameter
   
   one double parameter
   
   
    
6. 
   
   inheritance: reuse
   
   class A
   
   {
   
   protected int i=5;
   
   protected void xyz();
   
   }
   
   class B:A
   
   {
   
   (class B can use A)
   
   }
   
   class C
   
   {
   
   (class C can't use A)
   
   }
   
   
    
   class A
   
   {
   
   static protected void xyz()
   
   {
   
   Console.WriteLine(" ");
   
   }
   
   }
   
   class B:A
   
   {
   
   static void Main
   
   {
   
   static xyz();
   
   }
   
   }