using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int n = 10;

        Convert(n);

        //Console.WriteLine($"Converting {n} to hex: {Convert(n)}");

        n = 11;

        Convert(n);

        n = 15;

        Convert(n);

        n = 25;

        Convert(n);

    }

    public static void Convert(int n)

    {

        // char array to store  

        // hexadecimal number 

        char []hexaDeciNum = new char[100]; 

        // counter for hexadecimal number array 

        int i = 0; 

        while(n != 0) 

        {  

            // temporary variable to  

            // store remainder 

            int temp = 0; 

            // storing remainder in temp 

            // variable. 

            temp = n % 16; 

            // check if temp < 10 

            if(temp < 10) 

            { 

                hexaDeciNum[i] = (char)(temp + 48); //ASCII for 0 starts at 48

                i++; 

            } 

            else

            { 

                hexaDeciNum[i] = (char)(temp + 55); //ASCII: 55 + 10 => 'A'

                i++; 

            } 

            n = n / 16; 

        } 

        // printing hexadecimal number  

        // array in reverse order 

        for(int j = i - 1; j >= 0; j--) 

            Console.Write(hexaDeciNum[j]); 

        Console.WriteLine();

    }

}