using System;

​

class NumberToWord

{

    static void Main(string[] args) {

    Console.WriteLine("Enter an integer number: ");

    int number = 765432100;//Convert.ToInt32(Console.ReadLine());

    if(number <= 0)                   

       Console.WriteLine("Enter numbers greater than 0");

    else {

      NumberToWord numberToWord = new NumberToWord();

      numberToWord.pw((number/1000000000)," Billion");

      numberToWord.pw((number/10000000)%100," crore");

      numberToWord.pw(((number/100000)%100)," lakh");

      numberToWord.pw(((number/1000)%100)," thousand");

      numberToWord.pw(((number/100)%10)," hundred");

      numberToWord.pw((number%100)," ");

    }

  }

    public void pw(int num,String ch)

    {

        String[] one = new string[20]{" "," one"," two"," three"," four"," five"," six"," seven"," eight"," Nine"," ten"," eleven"," twelve"," thirteen"," fourteen","fifteen"," sixteen"," seventeen"," eighteen"," nineteen"};

        String[] ten = new string[10]{" "," "," twenty"," thirty"," forty"," fifty"," sixty","seventy"," eighty"," ninety"};

        if(num > 19) 

            Console.Write(ten[num/10]+""+one[num%10]);

        else

            Console.Write(one[num]);

        if(num > 0)

            Console.Write(ch);

    }

}