Readme.md

Const Member functions

Defination

Tese are member functions of class which allow only memory reading.It simply means we can not change any data member of class either const or non-const data member in Const member functions.The can be accessed by both const object and non-const object.

Note

constructors are also special member functions of class but it is not allowed to make constructors const functions.

Example code

#include<iostream>
using namespace std;

class Student
{
	String name;
	const int Id = 1;

public:

	//-----Getters/Accessors----
	string getName() const
	{
		//Here if you try to modify data member name,it will cause error although it is non-const
		// like:
		// name="Waleed";
      return name;

	}
	int getId() const
	{
		//Here if you try to modify data member Id,it will cause error
		// like:
		// Id=9;
      return Id;

	}

};
int main()
{
	Student student_1;
	Student const  student_2;

	//Accessing constant function by Non const-object
	student_1.getId();

	//Accessing constant function by const-object
	student_2.getId();

}