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Thread: Fixed Point Numbers - Mathematics

  1. #1
    Junior Member
    Join Date
    Jun 2012
    Thanked 1 Time in 1 Post

    Default Fixed Point Numbers - Mathematics

    I am stuck on a project in my intro to Java class.

    We have to create a code that will convert a number to a Fixed Point Number. I've got that part okay, but where I am stuck is in the mathematics portion of our assignment. We have to add, subtract, multiple w/ (scalar (float) method, and divide with scalar (float) method.

    Here is the code I have so far. If anyone could help point me in the right direction to getting a second number output and having the two numbers add, I would appreciate it.

    public class FixedNumber {
    public static final int lastSix = Integer.parseInt("111111", 2);
    int value;
    int value2;
    public FixedNumber(int value) {
        this.value = value << 6;
    public FixedNumber(int integral, float decimal) {
        this.value = (integral << 6) + (int)(decimal % 1 * 50);
    public FixedNumber(float value) {
        this.value = ((int)value << 6) + (int)(value % 1 * 50);
    public String toString() {
        return (value >> 6) + "." + ((value & lastSix) * 2);
        //return "" + ((value << 26) >>> 26);
    public static void main(String[] args) {
        FixedNumber number = new FixedNumber(12786783, 0.87654f); //integral, decimal
        FixedNumber number2 = new FixedNumber(3.876545f); //value

  2. #2
    Join Date
    Jul 2012
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    Thanked 9 Times in 9 Posts

    Default Re: Fixed Point Numbers - Mathematics

    Cross-posted at stackoverflow: fixed-point-numbers. Please be sure to show links to all cross-posts to prevent folks from giving answers that have already been given. Your cooperation in this is greatly appreciated.

  3. #3
    Junior Member
    Join Date
    Jun 2012
    Thanked 1 Time in 1 Post

    Default Re: Fixed Point Numbers - Mathematics

    Oh okay, thanks. I didn't know there was such a rule. I wasn't trying to do anything sneaky. I just am looking to find all the help I can. I'll make sure to follow that rule in the future.

  4. The Following User Says Thank You to BobDole6395 For This Useful Post:

    Fubarable (July 11th, 2012)

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