How to access the Private Member Function in C++

How to access the Private Member Function in C++?

A function declared inside the private access specifier of the class, is known as a private member function. A private member function can be accessed through the only public member function of the same class.

Example:

For example, there is a class named “Student”, which has the following private data members and public member functions:

Private Data members

• • • rNo is used to store the roll number of the student.
    • perc is used to store the percentage of the student.

Public Member functions

• • • read() –  read()  function is used here to read roll number and percentage of the student.
    • print() – print() function is used to print roll number and percentage of the student

Here, TakeNumbersBegin () and TakeNumbersBeginFinish () are the private member functions which are calling inside public member function in the same class

#include <iostream>
using namespace std;

class Student
{
	private:
		int rNo;
		float percentage;
		//private member functions
		void TakeNumbersBegin(void)
		{
			cout<<"Input start..."<<endl;
		}
		void TakeNumbersBeginFinish(void)
		{
			cout<<"Input end..."<<endl;
		}		
		
	public:
		//public member functions
		void read(void)
		{
			//calling first member function
			TakeNumbersBegin();
			//read rNo and percentage
			cout<<"Enter roll number: ";
			cin>>rNo;
			cout<<"Enter percentage: ";
			cin>>percentage;
			//calling second member function
			TakeNumbersBeginFinish();				
		}		
		void print(void)
		{
			cout<<endl;
			cout<<"Roll Number: "<<rNo<<endl;
			cout<<"Percentage: "<<percentage<<"%"<<endl;
		}
};

//Main code
int main()
{
	//declaring object of class student
	Student object1;
	
	//reading and printing details of a student
	object1.read();
	object1.print();
	
	return 0;
}

Output

Input started…

Enter roll number: 5

Enter percentage: 10

Input Finish…

Roll Number: 5

Percentage: 10