divide 2 hex numbers

This is a discussion on divide 2 hex numbers within the C Programming forums, part of the General Programming Boards category; hi I have to write a C program that divides 2 hex numbers to get a number with digits behind ...

  1. #1
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    divide 2 hex numbers

    hi

    I have to write a C program that divides 2 hex numbers to get a number with digits behind the comma. like 6644/CC88 = 0,5(decimal)

    I heard something about fixed point notation but I can't get it the right way.

    Can anyone help me on this?

    Thanks
    Dust

  2. #2
    Deathray Engineer MacGyver's Avatar
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    What is the actual question? You can read in hexadecimal numbers with scanf(). For printing out floating point values, you can set the amount of decimal places by adjusting the %f to reflect what you want. I believe you can do something like %.2f or whatever to get 2 decimal places.

  3. #3
    Just Lurking Dave_Sinkula's Avatar
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    Something like this?
    Code:
    #include <stdio.h>
    
    int main()
    {
       unsigned int a = 0x6644, b = 0xCC88;
       double result = (double)a / b;
       printf("%X / %X = %g\n", a, b, result);
       return 0;
    } 
    
    /* my output
    6644 / CC88 = 0.5
    */
    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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    The thing is that the program needs to get on a chip with limited space. so double could be a problem. is there a way to do it with char's?

  5. #5
    Just Lurking Dave_Sinkula's Avatar
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    Quote Originally Posted by dust555 View Post
    The thing is that the program needs to get on a chip with limited space. so double could be a problem. is there a way to do it with char's?
    Is it a proven bottleneck, or do you just want to reinvent the wheel?
    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.*

  6. #6
    and the hat of wrongness Salem's Avatar
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    > I heard something about fixed point notation but I can't get it the right way.
    I've heard about them as well, and they work just fine.

    Maybe you should post your attempt.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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