Inheritance Programs in C++

Ref: Kamthane.


/*C++ program to demonstrate example of private simple inheritance.*/

#include
using namespace std;
class A
{   private:
        int a;
    protected:
        int x;  //can access by the derived class
    public:
        void setVal(int v)
        {  x=v;   }
};
class B:private A
{
    public:
        void printVal(void)
        {
            setVal(10);  //accessing public member function here //protected data member direct access here
            cout << "value of x: " << x << endl;
        }
};
int main()
{
        B objB; //derived class creation
        objB.printVal();
        return 0;
}


/* C++ program to demonstrate example of multilevel inheritance.*/

#include
using namespace std;

//Base Class : class A
class A
{
    private:
        int a;
    public:
        void get_a(int val_a)
        {  a=val_a;  }
       
        void disp_a(void)
        {  cout << "Value of a: " << a << endl;   }
};
class B: public A
{
    private:
        int b;
    public:
        void get_b(int val_a, int val_b)
        {
            get_a(val_a);      //assign value of a by calling function of class A
            b=val_b;
        }
        void disp_b(void)
        {
            //display value of a
            disp_a();
            cout << "Value of b: " << b << endl;
        }
};

//Here class C is derived class and B is Base class

class C: public B
{
    private:
        int c;
    public:
        //assign value of a from here
        void get_c(int val_a, int val_b,int val_c)
        {
            /*** Multilevel Inheritance ***/
            //assign value of a, bby calling function of class B and Class A
            //here Class A is inherited on Class B, and Class B in inherited on Class B
            get_b(val_a,val_b);
            c=val_c;
        }
       
        void disp_c(void)
        {
            disp_b(); //display value of a and b using disp_b()
            cout << "Value of c: " << c << endl;
        }
};

int main()
{
    //create object of final class, which is Class C
    C objC;
    objC.get_c(10,20,30);
    objC.disp_c();
    return 0;
}
---------------------

/* C++ program to demonstrate example of Multiple inheritance.*/
class A
  {
    protected:
        int a;
  }
class B
  {
    protected:
        int b;
  }
class C
  {
    protected:
        int c;
  }
class D
  {
    protected:
        int d;
  }

class E:public A,B,C,D
  {
      int e;
     public:
      void getdata()
        {
          cout<<"\n Enter the values of a,b,c,d,e";
          cin>>a>>b>>c>>d>>e;
        }
      void showdata()
        {
          cout<<"\n Values of a"<