// Write a function that prints integer n>0 assuming that we can only print single

// decimal digit using Print(d) command that accepts integer argument in range 0..9.

using System;

using System.Diagnostics;

​

public class Program

{

    // d in the range 0...9

    static public void Print(int d)

    {

        Trace.Assert(0 <= d && d <= 9);

        Console.Write(d);

    }

    // n >= 0

    // prints all decimal digits of n for n>0

    // prints nothing for n=0

    static public void PrintDecimal(int n)

    {

        if (n != 0)

        {

            PrintDecimal(n / 10); // number of digits in parameter decreases by 1

            Print(n % 10);

        }

    }

    static public void Main()

    {

        Console.Write("Enter the integer number: ");

        PrintDecimal(Convert.ToInt32(Console.ReadLine()));

    }

}