package intro;

public class Program {

    public static void main(String[] args) {

        int decimal = asDecimal("11001101");

        System.out.println(decimal); // 205
        System.out.println(asString(205)); //205
    }

    public static String asString(int input) {
        String result = "";
        while (input > 0) {
            if (input % 2 == 0) {
                result = '0' + result;
            } else {
                result = '1' + result;
            }
        }

        return result;
    }

    public static int asDecimal(String input) {
        input = reverse(input);

        int result = 0;
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == '1') {
                result += pow(2, i);
            }
        }
        return result;
    }

    private static String reverse(String input) {
        String result = "";
                for (int i = 0; i < input.length(); i++){
                    result = input.charAt(i) + result;
                }
                return result;
    }

    private static int pow(int arg, int power) {
       if (arg == 0){
           return 1;
       }
       int result = 1;
       for (int i = 0; i < power; i++) {
           result *= arg;
       }

        return result;
    }
}