package Conversions;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;

/**
 *
 * @author Varun Upadhyay (https://github.com/varunu28)
 *
 */

// Driver Program
public class DecimalToAnyBase {
 public static void main (String[] args) throws Exception{
 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 System.out.println("Enter the decimal input below: ");
 int decInput = Integer.parseInt(br.readLine());
 System.out.println();

 System.out.println("Enter the base below: ");
 int base = Integer.parseInt(br.readLine());
 System.out.println();

 System.out.println("Decimal Input" + " is: " + decInput);
 System.out.println("Value of " + decInput + " in base " + base + " is: " + convertToAnyBase(decInput, base));

 br.close();
 }

 /**
 * This method produces a String value of any given input decimal in any base
 * @param inp Decimal of which we need the value in base in String format
 * @return string format of the converted value in the given base
 */

 public static String convertToAnyBase(int inp, int base) {
 ArrayList<Character> charArr = new ArrayList<>();

 while (inp > 0) {
 charArr.add(reVal(inp%base));
 inp /= base;
 }

 StringBuilder str = new StringBuilder(charArr.size());

 for(Character ch: charArr)
 {
 str.append(ch);
 }

 return str.reverse().toString();
 }

 /**
 * This method produces character value of the input integer and returns it
 * @param num integer of which we need the character value of
 * @return character value of input integer
 */

 public static char reVal(int num) {
 if (num >= 0 && num <= 9)
 return (char)(num + '0');
 else
 return (char)(num - 10 + 'A');
 }
}