multiple inheritance with English Distances : multiple base classes « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. multiple base classes

#include <iostream>  
  #include <string>  
  using namespace std;  

  class Type{  
     private:  
        string dimensions;  
        string grade;  
     public:                        
        Type() : dimensions("N/A"), grade("N/A"){  }  
                                    
        Type(string di, string gr) : dimensions(di), grade(gr)  
        {  }  
        void gettype(){  
           cout << "   Enter nominal dimensions (2x4 etc.): ";  
           cin >> dimensions;  
           cout << "   Enter grade (rough, const, etc.): ";  
           cin >> grade;  
        }  
        void showtype() const       
        {  
           cout << "\n   Dimensions: " << dimensions;  
           cout << "\n   Grade: " << grade;  
        }  
  };
  class Distance{  
     private:  
        int feet;  
        float inches;  
     public:    
        Distance() : feet(0), inches(0.0){  } 
        Distance(int ft, float in) : feet(ft), inches(in)  
          {  }  
        void getdist(){  
           cout << "   Enter feet: ";  cin >> feet;  
           cout << "   Enter inches: ";  cin >> inches;  
        }  
        void showdist() const       
        { cout  << feet << "\'-" << inches << '\"'; }  
  };
  class Lumber : public Type, public Distance  {  
     private:  
        int quantity;                      
        double price;                      
     public:                               
        Lumber() : Type(), Distance(), quantity(0), price(0.0)  
        {  }  
        Lumber( string di, string gr,      
                int ft, float in,          
                int qu, float prc ) :      
                Type(di, gr),              
                Distance(ft, in),          
                quantity(qu), price(prc)   
        {  }  
        void getlumber()  
        {  
           Type::gettype();  
           Distance::getdist();  
           cout << "   Enter quantity: "; cin >> quantity;  
           cout << "   Enter price per piece: "; cin >> price;  
        }  
        void showlumber() const  
        {  
           Type::showtype();  
           cout << "\n   Length: ";  
           Distance::showdist();  
           cout << "\n   Price for " << quantity  
               << " pieces: $" << price * quantity;  
        }  
  };  
  int main(){  
     Lumber siding;                   
     siding.getlumber();              
     Lumber studs( "2x4", "const", 8, 0.0, 200, 4.45F );  
    
     cout << "\nSiding";  siding.showlumber();  
     cout << "\nStuds";     studs.showlumber();  
     cout << endl;  
     return 0;  
    }