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Hex to float

spider111 · 2001-09-20T17:27:51

Hello all, Im having a little trouble working something out and i was wondering if you wonderfull people could help. I want to know how to convert a hexidecimal value into a float, so that when i look at the memory watch window i can calculate the float value. Thanks guys!!

General and Gameplay Programming Programming

Started by spider111 September 20, 2001 09:19 AM

10 comments, last by spider111 22 years, 7 months ago

OberonZ

122

September 20, 2001 03:18 PM

There is one more thing I should say about my code snipped for the sake of compleateness.

The code above assumes that the endien-ness of you byte stream and memory are the same. This is normally the case but not always true. For example, the stream could be comming from a file saved in little endian format (like and intel PC) and being processed on big endian machine (like a Mac)... in that case, I think you invert the indices in the stream like so

foo.bytes[0] = stream[3];foo.bytes[1] = stream[2];...

but I''m not 100% sure on that.

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Oluseyi

2,123

September 20, 2001 05:27 PM

Just for kicks...

If, for sake of clarity, we considered an 8-bit figure read in two 4-bit halves

// stream is ''abcdefgh''v[0] = stream[0]; // v[0] is efgh on little-endian machinesv[1] = stream[1]; // v[1] is abcd

Reading in reverse order yields:

v[0] = stream[0]; // v[0] is abcd on little-endian machinesv[1] = stream[1]; // v[1] is efgh

The proper solution lies in creating some form of mask and swapping bits that are non-symmetric about the midpoint. Or something like that.

Hex to float

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