Convert Decimal to any representation of the base 2 to base 16.

Kary.java

import java.util.Scanner;

public class Kary {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		long i = Integer.parseInt(scan.nextLine());
		int k = Integer.parseInt(scan.nextLine());
		
		if(k < 2 || k > 16) return;
		
		long n = i;
		
		int power = 1;
		
		while(power <= n / k) power *= k;
		
		while(power > 0) {
			if(n < power) { System.out.print(0); }
			else {
				char c = 'x';
				switch ((int) n / power) {
				case 1: c = '1'; break;
				case 2: c = '2'; break;
				case 3: c = '3'; break;
				case 4: c = '4'; break;
				case 5: c = '5'; break;
				case 6: c = '6'; break;
				case 7: c = '7'; break;
				case 8: c = '8'; break;
				case 9: c = '9'; break;
				case 10: c = 'A'; break;
				case 11: c = 'B'; break;
				case 12: c = 'C'; break;
				case 13: c = 'D'; break;
				case 14: c = 'E'; break;
				case 15: c = 'F'; break;
				}
				
				System.out.print(c);
				n -= power * (n / power);
			}
			power /= k;
		}
	}
}