Sum of the series Using friend function in C++

Sum of the series Using friend function in C++.

If we declare a function int show(T4Tutorials_SERIES n) as a friend in a class T4Tutorials_SERIES; then this function show() can access the private and protected members of the class T4Tutorials_SERIES. You must know that a global function can also be declared as a friend function of the class.

Syntax of friend function in C++

class class_name_T4Tutorials
{
…
friend return_type function_name(arguments);
…
}

C++ Program to show the Sum of the series Using friend function

#include <iostream>
using namespace std;
class T4Tutorials_SERIES
{
	private:
		    int n;
			int k=9;
			int sum=0;
	public:
		T4Tutorials_SERIES()
		{
		cout<<"Please enter a number: ";
		cin>>n;
		for(int i=1;i<=n;i++)
				{
					sum=sum+k;
					k=k*10+9;
				}
			}
				friend int show(T4Tutorials_SERIES);
	};
			int show(T4Tutorials_SERIES n)
			{
					cout<<"Hi, the sum of T4Tutorials_SERIES is: "<<n.sum;
			}
		
		int main()
		{
			T4Tutorials_SERIES n;
			show(n);
		}

#include <iostream>

using namespace std;

class T4Tutorials_SERIES

{

private:

int n;

int k=9;

int sum=0;

public:

T4Tutorials_SERIES()

{

cout<<"Please enter a number: ";

cin>>n;

for(int i=1;i<=n;i++)

{

sum=sum+k;

k=k*10+9;

}

friend int show(T4Tutorials_SERIES);

};

int show(T4Tutorials_SERIES n)

{

cout<<"Hi, the sum of T4Tutorials_SERIES is: "<<n.sum;

}

int main()

{

T4Tutorials_SERIES n;

show(n);

}

Output

Please enter a number:

Hi, the sum of T4Tutorials_SERIES is:

11106

Sum of the series Using friend function in C++

C++ Program to show the Sum of the series Using friend function

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