Write a C++ program for prototype constructors.

#include <iostream.h> 
 #include <conio.h> 
 #include <string.h> 
 const int size = 10; 
 class country 
 { 
        protected : 
                           char name[size]; 
                           int nostate; 
        public: 
                           country(); 
                           void input() 
                     { 
                           cout<<"Enter Name of Country: "; 
                           cin>>name; 
                           cout<<"Total Number of States : "; 
                           cin>>nostate; 
                     } 
                           void disp() 
                     { 
                           cout<<"Name of the Country : "<<name<<"\n"; 
                           cout<<"Total number of states : "<<nostate<<"\n"; 
                     } 
  }; 
                         country::country () 
                  { 
                         strcpy(name," "); 
                         nostate = 0; 
                         cout<<" Display the Values Initialised by the Constructors Country()\n"; 
                         cout<<"Name "<<name<<" NoState "<<nostate<<"\n"; 
                  } 
                         class state: public country 
                   { 
                        protected : 
                                            char name[size]; 
                                            double novill; 
                        public: 
                                            state(); 
                                            void input() 
                                     { 
                                            country:: input(); 
                                            cout<<"Enter Name of State : "; 
                                            cin>>name; 
                                            cout<<"Total Number of Villages : "; 
                                            cin>>novill; 
                                     } 
                                            void disp() 
                                    { 
                                            country:: disp(); 
                                            cout<<"State : "<<name<<"\n"; 
                                            cout<<"Total Villages : "<<novill<<"\n"; 
                                    } 
                    }; 
                               state:: state() 
                      { 
                               strcpy(name," "); 
                               novill=0; 
                              cout<<"Display the Values Initialised by the Constructors State\n"; 
                              cout<<"Name "<<name<<"NoVill "<<novill<<"\n"; 
                      } 
                              void main( ) 
                         { 
                                clrscr(); 
                                state sl; 
                                sl.input(); 
                                sl.disp(); 
                                getch(); 
                        }