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Thread: Unexpected output java

  1. #1
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    Angry Unexpected output java

    I am trying to write a program for converting positive binary inputs into hex. in the hex output the point (".")is missing.

    Suppose my expected output is e7.6 , but i am getting e76.

    only the "." is missing.

    here is my BinToHex class..

    import java.io.*;
     
     
    public class BinToHex {
        double tempDec,fractionpart;
        long longofintpart,templongDec;
        String inpu ="11100111.011";
        String hexOutput=null,tempDecString,hex = null;
     
        static int i = 1;
     
        public void convertbintohex() {
     
                if (inpu.contains(".")) {
                    int placesAfterPoint = inpu.length() - inpu.indexOf(".") - 1;//every thing
                    long numerator = Long.parseLong(inpu.replace(".", ""), 2);//goes 
                    double decimalOfInput = ((double) numerator) / (1L << placesAfterPoint);//alright  till here 
     
     
                    while (true) {
                        tempDec = decimalOfInput * 16;
                        if (tempDec == (int)tempDec) {
                            tempDecString = String.valueOf((long)tempDec);
                            templongDec = Long.parseLong(tempDecString, 10);
                            hexOutput = Long.toHexString(templongDec);
     
                            break;
                        } else {
                            longofintpart  = (long)tempDec;
                            hex=Long.toHexString(longofintpart);
                            if(i==1){
                                hexOutput = hex + ".";
                                i=i+1;
                            }else{
                                hexOutput = hexOutput + hex;
                            }
                            fractionpart = tempDec-(int)tempDec;
                            decimalOfInput = fractionpart;
                        }
                    }
                } else {
                        // this part is ok
                    tempDecString = String.valueOf(Integer.parseInt(inpu, 2));
                    templongDec = Long.parseLong(tempDecString, 10);
                    hexOutput = Long.toHexString(templongDec);
                }
                System.out.println(hexOutput);
        }   
    }
    my main Test class..
    public class Test{
        public static void main(String args[]){
            BinToHex i = new BinToHex();
            i.convertbintohex();    
        }
    }

    here is how decimal fraction is converted into hex
    or here too
    plz help me.
    Last edited by Tiash; October 1st, 2014 at 12:27 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Unexpected output java

    what is a "." doing in a hex number? I've never seen that.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Unexpected output java

    Quote Originally Posted by Norm View Post
    what is a "." doing in a hex number? I've never seen that.
    if there can't be "." in hex then how is a fraction represent in hex. indeed i've seen "." in hex several times.

    fraction can be presented in hex
    Last edited by Tiash; October 1st, 2014 at 12:29 AM.

  4. #4
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    Default Re: Unexpected output java

    I've never seen any non-decimal number with a point.
    I guess its allowed.

    What is the algorithm for creating the digits to the right of the point?

    Can you show the math needed to do the conversion?
    Also provide an example.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Unexpected output java


  6. The Following User Says Thank You to GregBrannon For This Useful Post:

    Norm (September 30th, 2014)

  7. #6
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    Default Re: Unexpected output java

    if there can't be "." in hex then how is a fraction represent in hex. indeed i've seen "." in hex several times.

    fraction can be presented in hex

  8. #7
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    Default Re: Unexpected output java

    What are the steps your program is doing to solve the problem.
    For the digits to the left of the point it would do something like this:
    convert base 2 digits to int
    convert int to base 16 digits

    What would it do for the digits to the right of the point?
    If you don't understand my answer, don't ignore it, ask a question.

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