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03-01-2011


Polymorphism: Polymorphism is one name many forms.

Def: "Implementing multiple functionality with the same name can be called as polymorphism that means implementing multiple functions with same name can be called as polymorphism"

We can achieve polymorphism in 2 ways.
           1. Function overloading
           2. Function overriding


1. Function overloading: Function overloading means having multiple methods with the same name but a different number of arguments or different type of arguments in a single class or a combination of base & derived class.

Eg: For function overloading
namespace functionoverloadingexample
{
   Public class calculate
    {
       Public int add(int a, int b)
      {
         return a + b;
      }
      Public int add(int a , int b, int c)
     {
         return a+b+c;
     }
     Public double add(double a, double b)
    {
        return a + b;
     }
     Public double add(double a , double b, double c)
     {
        return a+b+c;
     }

   Class mainclass
   {
      Void main()
         {
            Calculate cal = new calculate();
            int res1 = cal.add(10, 20);
            Console.WriteLine("addition of two integers is " +res1);
            int res2 = cal.add(10, 20, 30);
            Console.WriteLine("Addition of 3 integers is " +res2)
            double res3 = cal.add(10.4, 20.5);
            Console.WriteLine("addition of two double is " +res3);
            int res4 = cal.add(10.4, 20.5, 30.5);
            Console.WriteLine("addition of 3 double is " +res4);
            Console.ReadLine();
         }
     }
}
Output: addition of two integer is 30
              addition of 3 integer is 60
              addition of 2 double is 30.9
              addition of 3 double is 61.4

Function overloading will depend on below 3 points
    1. Type of parameter to a function
    2. Number of parameter to a function
    3. Order of parameter to a function

Function overloading will not depend on below two points.
    1. return type of a function.
    2. Name of parameter to a function


Function overloading will depend on
1. Type of parameter to a function:
namespace typeofparameterexample
{
   Public class myclass
     {
         Public void print(int a)
         {
            Console.WriteLine("a value is " +a);
         }
        Public void print(String s)
        {
           Console.WriteLine("S avalue is " +s);
        }

 Class mainclass
  {
      Void main()
       {
          myclass mc = new myclass();
          mc.print(10);
          mc.print(Sathya);
          Console.ReadLine();
       }
  }
}
Output: a value is 10
            s value is Sathya.





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