Write a program in C++ to print Floyd’s Triangle by using the friend function.

April 23, 2020 Prof. Fazal Rehman Shamil C++ Leave a comment

If we declare a function friend int show(T4Tutorials_Floyds_Triangle);as a friend in a class T4Tutorials_Floyds_Trianglethen this function int show (T4Tutorials_Floyds_Triangle a)can access the private and protected members of the class T4Tutorials_Floyds_Triangle.

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
{
…
friend return_type function_name(arguments);
…
}

#include<iostream>
using namespace std;
class T4Tutorials_Floyds_Triangle
{
	public:
		int i,j,p,q,n;
		public:
			int Floyds_Pattern()
			{
				cout<<"enter no.of rows";
				cin>>n;
			}
			friend int show(T4Tutorials_Floyds_Triangle);
};
int show (T4Tutorials_Floyds_Triangle a)
{
	for(a.i=1;a.i<=a.n;a.i++)
	{
			if(a.i%2==0)
		{
			a.p=1;
			a.q=0;
		}
		else
		{
			a.p=0;
			a.q=1;
		}
		for(a.j=1;a.j<=a.i;a.j++)
		{
			if(a.j%2==0)
			{
				cout<<a.p;
			}
			else
			{
				cout<<a.q;
			}
		}
		cout<<endl;
	}
}
int main()
{
	T4Tutorials_Floyds_Triangle a;
	a.Floyds_Pattern();
	show(a);
}

#include<iostream>

using namespace std;

class T4Tutorials_Floyds_Triangle

{

public:

int i,j,p,q,n;

public:

int Floyds_Pattern()

{

cout<<"enter no.of rows";

cin>>n;

}

friend int show(T4Tutorials_Floyds_Triangle);

};

int show (T4Tutorials_Floyds_Triangle a)

{

for(a.i=1;a.i<=a.n;a.i++)

{

if(a.i%2==0)

{

a.p=1;

a.q=0;

}

else

{

a.p=0;

a.q=1;

}

for(a.j=1;a.j<=a.i;a.j++)

{

if(a.j%2==0)

{

cout<<a.p;

}

else

{

cout<<a.q;

}

cout<<endl;

}

int main()

{

T4Tutorials_Floyds_Triangle a;

a.Floyds_Pattern();

show(a);

}

Output

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Prof. Fazal Rehman Shamil

CEO @ T4Tutorials.com
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