Write a program to convert decimal to  hexadecimal

import java.io.*;
class dec2hex

{
    public static void main(String args[])throws IOException
    {
        BufferedReader br=new BufferedReader(new               InputStreamReader(System.in));
        System.out.println("enter a decimal number");
        int n=Integer.parseInt(br.readLine());
        int r;
        String s="";
        char dig[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        while(n>0)
        {
            r=n%16;
            s=dig[r]+s;
            n=n/16;
        }
        System.out.println("output="+s);
    }
}   

Output:

enter a decimal number
123
output=7B
enter a decimal number
129
output=81