package class9_3_BitwiseAnd_start;// Dr. Yoder. MSOE. 10 February 2017

public class BitwiseAndExample {

    public static final int BITS_IN_INT = 32;
    public static final int BITS_IN_BYTE = 8;

    public static void main(String[] args) {
        int i = 255;
        System.out.println("i = " + i);
        System.out.println("contents: "+ showBits(i)); // for debugging only!
        byte b = (byte)i;
        System.out.println("b = " + b);
        System.out.println("contents: "+ showBits(b)); // for debugging only!
        int i2 = b;
        System.out.println("i2 = " + i2);
        System.out.println("contents: "+ showBits(i2)); // for debugging only!
        int i3 = 0xff & b;
        System.out.println("i3 = " + i3);
        System.out.println("contents: "+ showBits(i3)); // for debugging only!

    }

    /**
     * Convert a byte into a string
     * where each character of the string shows one bit
     * that is actually stored for that byte.
     * @param b the byte to show
     * @return the string as described above
     */
    private static String showBits(byte b) {
        String bits = Integer.toBinaryString(Byte.toUnsignedInt(b));
        int bitsToAdd = BITS_IN_BYTE -bits.length();
        for(int index = 0; index < bitsToAdd; index++) {
            bits = "0"+bits;
        }
        return bits;
    }

    /**
     * Convert an int into a string
     * where each character of the string shows one bit
     * that is actually stored for that byte.
     * @param i the int to show
     * @return the string as described above
     */
    private static String showBits(int i) {
        String bits = Integer.toBinaryString(i);
        int bitsToAdd = BITS_IN_INT -bits.length();
        for(int index = 0; index < bitsToAdd; index++) {
            bits = "0"+bits;
        }
        return bits;
    }
}