Write a method which transforms an integer into a binary number, no libraries using (on a whiteboard).

Question

developer · Accepted Answer

http://stackoverflow.com/questions/8151435/integer-to-binary-array

Mario R. · Answer

public static String toBinaryString (int n){
		StringBuffer sb = new StringBuffer ();
		while ( n > 0 ){
			int bit = n%2;
			sb.insert(0, bit);
			n=n/2;
		}
		return sb.toString();
	}
	
	public static void main(String[] args) {
		System.out.println (toBinaryString(25));
	}

Mike · Answer

def num_bits(n)
  nbits = 0
  while n > 1
    n /= 2
    nbits += 1
  end

  nbits
end
def int2bin(n)
  nbits = x = num_bits(n)
  total = 0
  bin = ""

  for i in (0..nbits)
    addon = (2 ** x)
    if((total + addon) <=  n)
      bin += "1"
      total += addon
    else
      bin += "0"
    end

    x -= 1
  end

  bin
end

Anonymous · Answer

Perfect syntax was not required

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