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Thread: What would be the smallest positive float (epsilon) such that 1.0 + epsilon != 1.0f?

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    Exclamation What would be the smallest positive float (epsilon) such that 1.0 + epsilon != 1.0f?

    What would be the smallest positive float (epsilon) such that 1.0 + epsilon != 1.0f?
    What is the condition that I have to use to attain this?
    Last edited by rosh72851; September 23rd, 2008 at 05:00 PM.


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    Default Re: machine epsilon

    Ok I figured how to do that.

    Next question, how do I convert float and double data types to binary. For float, ive used the function
    Integer.toBinaryString(Float.floatToRawIntBits(value));

    But the answer doesnt seem to be right.
    Please suggest.

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    Default Re: machine epsilon

    Anybody. I just need to know to convert a float into binary. Not the code.

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    Default Re: machine epsilon

    Quote Originally Posted by rosh72851 View Post
    Ok I figured how to do that.

    Next question, how do I convert float and double data types to binary. For float, ive used the function
    Integer.toBinaryString(Float.floatToRawIntBits(value));

    But the answer doesnt seem to be right.
    Please suggest.
    The above code is what you need to convert a float to binary. I'm not sure why this is not working for you?

    Also, take a look at:

    Float.parseFloat]Float (Java 2 Platform SE v1.4.2)()
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: machine epsilon

    If I input a value of 1 into the function: Integer.toBinaryString(Float.floatToRawIntBits(val ue));

    I get the solution as 111111100000000000000000000000. which is definitely wrong.

    If someone can tell me manually how to convert a decimal number into a decimal binary, I can manually code it.

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    Default Re: machine epsilon

    This is how to convert int to Binary:

    public class Class1 {
     
     public static void main(String[] args) {
     
      int myInt = 1;
      System.out.println(Integer.toBinaryString(myInt));
     }
    }
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    Default Re: machine epsilon

    Quote Originally Posted by rosh72851 View Post
    But the answer doesnt seem to be right.
    What makes you think so? What should it look like?

    A Java float is a single-precision 32-bit format IEEE 754 value (see IEEE Standard for Binary Floating-Point Arithmetic, ANSI/IEEE Standard 754-1985). That's probably what you're seeing.

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