Inherited as public : public inheritance « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. public inheritance

#include <iostream>
using namespace std;

class base {
protected:
  int i, j;
public:
  void set(int a, int b) { 
     i=a; 
     j=b; 
  }
  void show() { 
     cout << i << " " << j << "\n"; 
  }
};

class derived1 : public base {
  int k;
public:
  void setk() { 
     k = i*j; 
  }
  void showk() { 
     cout << k << "\n"; 
  }
};

class derived2 : public derived1 {
  int m;
public:
  void setm() { 
     m = i-j; 
  }
  void showm() { 
     cout << m << "\n"; 
  }
};

int main()
{
  derived1 ob1;
  derived2 ob2;

  ob1.set(2, 3);
  ob1.show();
  ob1.setk();
  ob1.showk();

  ob2.set(3, 4);
  ob2.show();
  ob2.setk();
  ob2.setm();
  ob2.showk();
  ob2.showm();

  return 0;
}

2 3
6
3 4
12
-1