Virtual base class C++ program to print mirrored right triangle star pattern

C++ program to print mirrored right triangle star pattern using virtual base class.

#include<iostream>
using namespace std;
class grand
{
	public :
		int i;
};

class p1:virtual public grand
{
	public :
		int j;
};
class p2:virtual public grand
{
	public :
	int r;	
};

class derived:public p1,public p2
{
	public :
		int patern()
		{
			cout<<"input No of rows : ";
			cin>>r;
			for(j=1 ; j<=r ; j++)
			{
				for(i=j ; i<r ; i++)
				{
					cout<<" ";
				}
				for(i=1 ; i<=j ; i++)
				{
					cout<<"*";
				}
				cout<<"\n";
			}
		}
};
int main()
{
	derived a;
	a.patern();
 }

Output

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c++ star triangle by using the virtual base class.
hollow mirrored right triangle star pattern in C++ by using the virtual base class.