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How to write a program in C++ to display the pattern like right angle triangle with a number ?

#include <iostream>

using namespace std;

int main()

{

   int i,j,rows;

    cout << "\n\n Display the pattern using number starting from 1:\n";

    cout << "------------------------------------------------------\n";

    cout << " Input number of rows: ";

    cin >> rows;

   for(i=1;i<=rows;i++)

   {

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

	   cout<<j;

	cout<<endl;

   }	

}