program to print following output using for loop.

using System;

namespace Example2

{

    class Program

    {

        static void Main(string[] args)

        {

            int i, j;

            i = 0;

            j = 0;

            for (i = 1; i <= 5; i++)

            {

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

                {

                    Console.Write(i);

                }

                Console.Write("\n");

            }

            Console.ReadLine();

        }

    }

}

O/P:

1

22

333

4444

55555