4.5: Types of Inheritance in C++

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Single Inheritance: In single inheritance, a class is allowed to inherit from only one class. i.e. one sub class is inherited by one base class only.

A derived class B that inherits only from one base class A

Syntax:

class subclass_name : access_mode base_class 
{ 
   //body of subclass 
};

// C++ program to      explain 
// Single inheritance 
#include <iostream>       
using namespace std;

// base class 
class Vehicle 
{ 
      public: 
      Vehicle() 
      { 
         cout << "This is a Vehicle" << endl; 
      } 
};

// sub class derived from the base classes 
// although this class does NOTHING
class Car: public Vehicle
{   
   public:
   Car()
   {
       cout << "This is a Car" << endl;
   }

};

// main function 
int main() 
{ 
    // creating object of sub class will 
    // invoke the constructor of base classes 
    Car obj; 
    return 0; 
}

Output - notice that the parent class is initialized first, then the child class - which inherits from the parent class.

This is a Vehicle
This is a Car

Contributed by Harsh Agarwal
Geeks for Geeks