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RageOfFury
Joined: 07 Feb 2008
Posts: 17
Location: Canada
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| Need help understanding a line of code |
 Posted: Thu Mar 27, 2008 9:19 am |
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I'm currently in the middle of converting a C program written for another type of micro controller to PICC. Everything is going quite smoothly except that now I'm stuck at this line of code:
ucCount = abs(fAltitude % 10);
Ok I know that the abs() function computes the absolute value of a number, but what type of formula is fAltitude % 10 ? 
Perhaps it's the value of fAltitude * 10%...I'm not totally sure.
Can anyone enlighten me?  |
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timer0
Guest
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| Posted: Thu Mar 27, 2008 9:29 am |
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var % 10
that's the module(remaining) of var/10
so for example:
N = 185
N/10 = 18
N%10 = 5
so (18*10) + 5 = 185 |
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RageOfFury
Joined: 07 Feb 2008
Posts: 17
Location: Canada
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| Posted: Thu Mar 27, 2008 9:38 am |
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| timer0 wrote: | var % 10
that's the module(remaining) of var/10
so for example:
N = 185
N/10 = 18
N%10 = 5
so (18*10) + 5 = 185 |
Ah, ok now I understand. Thanx for clearing that up.  |
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newguy
Joined: 24 Jun 2004
Posts: 1903
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| Posted: Thu Mar 27, 2008 9:45 am |
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If fAltitude is always positive, it can be done very quickly:
| Code: | | ucCount = (int16)fAltitude % 10; |
I'm assuming that ucCount is int16 - if it is an 8 bit int, just change the cast to int8. If fAltitude isn't always positive, just use the CCS abs() function. However, if you "feed" abs() a float, it will return a float. You'll still have to cast the result to an int:
| Code: | | ucCount = (int16)abs(fAltitude) % 10; |
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