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Freddie
Joined: 06 Sep 2003
Posts: 49
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| Break up float to 2 bytes |
 Posted: Thu Apr 05, 2007 5:49 am |
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I want to save a float as 2 bytes. One byte representing the part before the decimal, one representing the part after the decimal.
How can I extract the parts into seperate bytes? |
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Ttelmah
Guest
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| Posted: Thu Apr 05, 2007 7:51 am |
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Obviously, you will be limited to numbers 255 and below.
If you simply take:
| Code: |
int main;
float val;
val=123.45;
main=val;
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You will get the part in front of the decimal place stored in the integer.
Now, to do the whole thing, you can use:
| Code: |
int decimal;
int main;
float val;
float decimalf;
val=123.45;
decimal = 100*modf(val,&decimalf);
main=decimalf;
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However 'beware' of the inaccuracies in this...
| Code: |
int main;
int decimal;
float val;
val=123.45;
main=val;
decimal=(val*100)-(main*100L);
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Will probably be faster, and may be better.
I have to ask, 'why have a float at all'?. Consider using a larger scaled integer in the first place. Makes arithmetic much faster, and makes this a lot easier...
Best Wishes |
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