Converting Float to Hexadecimal

This is a discussion on Converting Float to Hexadecimal within the C Programming forums, part of the General Programming Boards category; Converting a floating point number to hexadecimal I'm trying to convert a floating point number (single precision). I want to ...

  1. #1
    Registered User denizengt's Avatar
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    Converting Float to Hexadecimal

    Converting a floating point number to hexadecimal
    I'm trying to convert a floating point number (single precision). I want to show it's bit representation in hexadecimal, but I'm unsure on how to approach the problem. Any clues?



    Hmm, I've somehow posted this in the C++ boards, how can I delete that thread?

  2. #2
    ATH0 quzah's Avatar
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    Re: Converting Float to Hexadecimal

    Originally posted by denizengt
    Converting a floating point number to hexadecimal
    I'm trying to convert a floating point number (single precision). I want to show it's bit representation in hexadecimal, but I'm unsure on how to approach the problem. Any clues?



    Hmm, I've somehow posted this in the C++ boards, how can I delete that thread?
    Click on "Edit Post", check the delete box. Hit delete.

    Back to your oringal issue: Don't. Why would you want to convert a floating point number to hex? There is no decimal in hex. Drop the decimal, make it integeral, and convert that way.

    Or, multiply by ten, making it integral, conver to hex, and do the opposite when you convert back.


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
    Comment your source code! Lynux-Penguin's Avatar
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    Code:
    printf("%xl",(usigned long)long_number); //outputting
    scanf("%xl",&long_number); //inputting
    
    long blah = (unsigned long) 0x8f6bcdee879l; //initializing
    hope this helps a bit
    Asking the right question is sometimes more important than knowing the answer.
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  4. #4
    Just Lurking Dave_Sinkula's Avatar
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    >I want to show it's bit representation in hexadecimal, but I'm unsure on how to approach the problem. Any clues?

    Maybe something like this.
    Code:
    #include <stdio.h>
    
    int main(void)
    {
       union 
       {
          float          f;
          unsigned char  b[sizeof(float)];
       } v = { 3.1415926535897932384626433832795F };
       size_t i;
       printf("%f is stored as ", v.f);
       for ( i = 0; i < sizeof(v.b); ++i )
       {
          printf("%02X%c", v.b[i], i < sizeof(v.b) - 1 ? '-' : '\n');
       }
       return 0;
    }
    
    /* my output
    3.141593 is stored as DB-0F-49-40
    */
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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