Converting Hex value to negative fractional decimal

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Hello,

I am trying to convert the Hex value ('BF6E23F8').

I know that the answer should be (-0.93023634).

Please correct me if I am wrong, but I need to convert the Hex value to 2's complement binary, then to decimal?

I've attempted to use quite a few functions I've found online including hex2dec, Fr_bin2dec.

But I am hoping you can direct me towards the solution.

Thanks,

Ryan D'Souza

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James Tursa 2015-2-4

Why do you know the answer for this particular example is -0.93023634? Do you have other example pairs you can post?

Ryan 2015-2-5

I know the answer for this example because the Hex values were converted by someone before I got my hands on it. But they were using another application and doing the conversion by hand, so I have no indication of what steps were used.

Sure, here are some more examples :

(Hex) --> (Decimal)

3CCCE6BD -> 0.025012368

BF6E158D -> -0.930016339

C1C63C18 -> -24.77934265

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Answer 1

Guillaume 2015-2-5

在 MATLAB Online 中打开

2 个投票

It looks like your hexadecimal values are the representation of a single precision IEEE 754 number, in little endian format.

hexvalues = ['BF6E23F8';'3CCCE6BD';'BF6E158D';'C1C63C18']
hexbits = uint32(hex2dec(hexvalues));       %convert hexadecimal to 32-bit integer representation
[~, ~, endianness] = computer;
if endianness == 'B'
   hexbits = swapbytes(hexbits);            %on a big-endian computer, switch endianness
end
hexassingle = typecast(hexbits, 'single')   %cast from integer to single

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Ryan 2015-2-9

It worked! thanks a lot!

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