Program of cascading:

class vector{

                private :

                int v[3];

                public:

                friend istream & operator >> (istream & ,vector &);//overloading the

                                                                                                                //insertion operator

                                                                                                                // for the vector type object

                friend ostream & operator << (ostream & ,vector &);

                friend vector operator * (vector,int);

                friend vector operator * (int ,vector);

                void show();

                 }; // class termination

                 istream & operator >>(istream &din ,vector & b )

                                {

                                for( int i=0;i<3;i++)

                                                {

                                                cout<<"enter "<

                                                din >> b.v[i];

                                                }

                                  return din;//for cascading

                                }

                   ostream & operator <<(ostream &dout ,vector & b )

                                {

                                for( int i=0;i<3;i++)

                                                {

                                                dout << b.v[i]<<"\n";

                                                }

                                  return dout; //for cascading

                                }

       vector operator *(vector a,int b)//function overloading

                                {          vector c;

                                                for(int i=0;i<3;i++)

                                                                c.v[i]=b*a.v[i];

                                  return c;

                                  }

                vector operator *(int a,vector b)

                                {

                                vector c;

                                                for(int i=0;i<3;i++)

                                                                c.v[i]=a*b.v[i];

                                  return c;

                       }

                void vector ::show()

                {

                                 for (int i=0;i<3;i++)

                                                cout << "\n"<

                                 }

                void main()

                {

                vector a,b,c;

                clrscr();

                cin>>b;//calling function cin is 1st argument and b other

                cout << b;

                a=b*10;

                c=20*b;

/*           b.show();

                a.show();

                c.show();*/

                cout<

                cout<

                getch();

       }