Write a C++ Program for Inheritance Beyond Single Level

#include <iostream.h> 
 #include<conio.h> 
 class industry 
 { 
     protected: 
                        char name[25]; 
     public: 
                 void insert() 
                   { 
                        cout<<"Enter Your Name : "; 
                        cin>>name; 
                   } 
                 void output() 
                  { 
                        cout<<"\nName : "<<name<<"\n"; 
                  } 
 }; 
 class computer: public industry 
 { 
      protected : 
                         char education[10]; 
                         float salary; 
      public: 
                 void insert() 
                  { 
                        industry:: insert(); 
                        cout<<"Enter Your Highest Qualification : "; 
                        cin>>education; 
                        cout<<"\nEnter Your Salary : "; 
                        cin>>salary; 
                   } 
                 void output() 
                  { 
                        industry::output(); 
                        cout<<"Highest Qualification is : "<<education<<"\n"; 
                        cout<<"Salary Drawn is : "<<salary<<"\n"; 
                  } 
 }; 
 class manager : public industry 
 { 
     protected : 
                        int experience; 
                        char grade; 
    public: 
                void insert() 
                 { 
                        industry::insert(); 
                        cout<<"Your Previous Experience : "; 
                        cin>>experience; 
                        cout<<"\nYour Grade : "; 
                        cin>>grade; 
                  } 
                void output() 
                 { 
                        industry::output(); 
                        cout<<"Total Previous Experience : "<<experience<<"\n"; 
                        cout<<"Your Grade : "<<grade<<"\n"; 
                  } 
 }; 
 class admin: public industry 
 { 
     protected : 
                       char type[10]; 
     public: 
               void insert() 
                { 
                      industry::insert(); 
                      cout<<"Type : "; 
                      cin>>type; 
                } 
              void output() 
               { 
                      industry::output(); 
                      cout<<"Type : "<<type<<"\n"; 
                } 
 }; 
 class soft: public computer 
 { 
    protected : 
                      char expert[10]; 
    public: 
              void insert() 
               { 
                      computer::insert(); 
                      cout<<"Enter Your Expertise Field : "; 
                      cin>>expert; 
                } 
              void output() 
               { 
                      computer::output(); 
                      cout<<"Expertise Field is : "<<expert<<"\n"; 
               } 
 }; 
 class hard: public computer 
 { 
    protected: 
                     int experience; 
    public: 
             void insert() 
              { 
                      computer::insert(); 
                      cout<<"Enter Previous Experience : "; 
                      cin>>experience; 
               } 
            void output() 
             { 
                     computer::output(); 
                     cout<<"Previous Experience in Hardware : "<<experience<<"\n"; 
              } 
 }; 
       void main( ) 
 { 
                  soft sl; 
                  hard h1; 
                  manager m1; 
                  admin a1; 
                  clrscr(); 
                  cout<<"Enter the Data for Software Personnel : "<<endl; 
                  sl.insert(); 
                  cout<<"\nInformation of Software Personnel : "; 
                  sl.output(); 
                  cout<<"\nEnter the Data for Hardware Personnel : \n"; 
                  h1.insert(); 
                  cout<<"\nInformation of Hardware Personnel : "; 
                  h1.output(); 
                  cout<<"\nEnter Data for Manager : \n"; 
                  m1.insert(); 
                  cout<<"\nManager Information : "; 
                  m1.output(); 
                  cout<<"\nEnter Data for Administrative Staft : \n"; 
                  a1.insert(); 
                  cout<<"\nOutput of the Administrative Staff : "; 
                  a1.output(); 
                  getch(); 
 }