Question

Mechanism for polymorphism in c++

Answer 1

Polymorphism as the name itself suggests is a feature of C++ which allows representation of the same entity in more than one forms.

In C++ polymorphism can be attained in following ways:
  1. Function Overloading
  2.Operator Overloading
  3. Constructor Overloading

Eg:1.

int sum(int a, int b)
     {   return(a+b);   }
int sum(int a, int b, int c)
     {   return(a+b+c);   }
int main()
     { 
          int a=2,b=5,c=8;
          cout<<sum(a,b);   // Output will be 7; and 1st sum function with two parameters will be called.
          cout<<sum(a,b,c);   // Output will be 15; and 2nd sum function with 3 parameter will be called.
           return(0);
       }

Eg: 2.

       class example
          {
              int a;
              public:
              example()
                     {
                         cout<<"Enter a number:";
                         cin>>a;
                      }
              example(int x)
                      {
                           a=x;
                      }
         };

int main()
       {
           int m=5;
           example e;     // 1st constructor with no parameter will be called.
           example f(m); //2nd constructor with 1 parameter will be called.
           return 0;
        }