updt 26/08/2013

package javaapplication3;

public class JavaApplication3 {

    public static void main(String[] args) {
   //     dectobin(args,2036);
   //     bintodec(args, "1111");
   //     octtodec(args, "10021");
   //     dectooct(args, 4113);
   //     dectohex(args, 9889);
        hextodec(args, "0");
    }

    public static void JavaApplication3() {

    }


    static void hextodec(String[] args, String a){
        int[] tab = new int[255];
        int i = 0;
        while(i <= a.length() - 1){
            tab[i] = (int) Math.pow(16,i);
            p(tab[i]);
            i = i + 1;
        }
        int r = 0;
        i = 0;
        int l = a.length() - 1;
        while(i <= a.length() - 1){
            r = r + (nehex(a.charAt(i)) * tab[l]);
            l = l - 1;
            i = i + 1;
            p("\n" + r);
        }
        p("\n" + r);

    }

    static void octtodec(String[] args, String a){
        if(a.contains("8") || a.contains("9")){
            return;
        }
        int[] tab = new int[255];
        int i = 0;
        while(i <= a.length() - 1){
            tab[i] = (int) Math.pow(8,i);
            p(tab[i]);
            i = i + 1;
        }
        int r = 0;
        i = 0;
        int l = a.length() - 1;
        while(i <= a.length() - 1){
            r = r + (Integer.valueOf(String.valueOf(a.charAt(i))) * tab[l]);
            l = l - 1;
            i = i + 1;
        }
        p("\n" + r);
      /*  while(i > 0){
            i = i - 1;
            if(a >= tab[i]){
                r =  r + "1";
                a = a - tab[i];
            }
            else
            {
                r = r + "0";
            }
        }
        p("\n" + r); */
    }

    static String hexen(Integer n){
        String a = Integer.toString(n);
        if(n < 10){
            return a;
        }
        switch(n){
            case 10: return "A";
            case 11: return "B";
            case 12: return "C";
            case 13: return "D";
            case 14: return "E";
            case 15: return "F";
        }
        return "";
    }

    static Integer nehex(Character n){
        switch(n){
            case 'A': return 10;
            case 'B': return 11;
            case 'C': return 12;
            case 'D': return 13;
            case 'E': return 14;
            case 'F': return 15;
            default: break;
        }
        int a = Integer.getInteger(String.valueOf(n));
        if(a < 10){
            return a;
        }
        return 0;
    }



    static void dectohex(String[] args, Integer a){
        String r = "";
        while(a > 0){
            r = hexen(a % 16) + r;
            a = a / 16;
            p(a + "\n");
        }
        p("\n" + r);
    }

    static void dectooct(String[] args, Integer a){
        String r = "";
        while(a > 0){
            r = Integer.toString(a % 8) + r;
            a = a / 8;
            p(a + "\n");
        }
        p("\n" + r);
    }





    static void dectobin(String[] args, Integer a){
        int[] tab = new int[255];
        int i = 0;
        while(Math.pow(2,i) <= a){
            tab[i] = (int) Math.pow(2,i);
            p(tab[i]);
            i = i + 1;
        }
        String r = "";
        while(i > 0){
            i = i - 1;
            if(a >= tab[i]){
                r =  r + "1";
                a = a - tab[i];
            }
            else
            {
                r = r + "0";
            }
        }
        p("\n" + r);
    }

    static void bintodec(String[] args, String a){
        int[] tab = new int[255];
        int i = a.length() - 1;
        while(i >= 0){
            tab[i] = (int) Math.pow(2,i);
            p(tab[i]);
            i = i - 1;
        }
        i = a.length() - 1;
        int r = 0;
        int l = 0;
        while(i >= 0){
            r = r + (Integer.valueOf(String.valueOf(a.charAt(i))) * tab[l]);
            l = l + 1;
            i = i - 1;
        }
        p("\n" + Integer.toString(r));
    }

    static void p(Object stri){
        System.out.print(stri);
    }
}