import java.nio.ByteBuffer;


public class BitConverter {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		for(int i=1; i<=100 ;i++){
			System.out.println(i);
			System.out.println("InvSqrt(9) = " + InvSqrt(i));
			System.out.println("1/sqrt(9) = " + 1/Math.sqrt(i));
			System.out.println("\n");
		}		
	}
	
	
	static float InvSqrt(float x){
		float xhalf = 0.5f * x;

		int i = Float.floatToRawIntBits(x); // converte para inteiro mantendo a representacao ieee 754
		
		i = 0x5f3759df - (i >> 1);			// a tal operacao

		x = Float.intBitsToFloat(i);
		
		x = x * (1.5f - xhalf * x * x);
		
		return x;		
	}
}