Bin Test

package javaapplication3;

public class JavaApplication3 {

    public static void main(String[] args) {
   //     dectobin(args,2036);
   //     bintodec(args,"1111");
   //     octtodec(args,"10021");
    }

    public static void JavaApplication3() {

    }

    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 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);
    }
}