gistfile1.txt

public class Labb1 {

	public static int length = 1;
	public static int n;
	public static void main(String args[]) {

		count(2);
		String _n = "101";
		n = _n.length();
		shifter(_n);
		counter(999);

	}
	
	//upg 1a
	public static void count(int index) {
		System.out.print(index);
		if (index > 0) {
			count(index - 1);
		}
	}
	
	//upg 1b
	public static void shifter(String _n){
		System.out.print(_n);
		if(n>0){			
			System.out.print(" -> ");
			StringBuilder sN = new StringBuilder();
			sN.append(_n);
			char temp = sN.charAt(_n.length()-n);
			sN.deleteCharAt(_n.length()-n);
			if(temp == '0') sN.insert(_n.length()-n, '1');
			if(temp == '1') sN.insert(_n.length()-n, '0');
			--n;
			shifter(sN.toString());
		}
	}

	//upb 1c
	public static void counter(int n) {
		if(Math.abs(n/10f) >= 10){
			length++;
			counter(n/10);
		}else{
			if(Math.abs(n)>=10) length++;
			System.out.println(length);
		}
		
		
	}
}