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vty0207
Joined: 17 Nov 2008
Posts: 2
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| does ccs support double precision floating point number? |
 Posted: Mon Nov 17, 2008 3:04 am |
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does ccs support double precision (64 bit) floating point number ?
I need 8-9 significant digit after the floating point. Eg. 3.141592654. |
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PICoHolic
Joined: 04 Jan 2005
Posts: 224
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| Posted: Mon Nov 17, 2008 3:50 am |
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The manual says:
| Quote: | | double is a reserved word but is not a supported data type. |
But if write down:
| Code: | | double p = 3.1415123; |
it compiles under 4.082
mmm.... |
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Ttelmah
Guest
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| Posted: Mon Nov 17, 2008 4:02 am |
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Double is just treated as an alias for float. So it'll compile, but not give you any extra accuracy, _unless_ you are using PCD. On these chips, double is supported.
If you look in the maths include file, you will find a whole suite of 'overloads' for the 64bit functions, that only only apply if your compiler is PCD.
Best Wishes |
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vty0207
Joined: 17 Nov 2008
Posts: 2
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| Posted: Mon Nov 17, 2008 7:18 pm |
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| What is PCD ? Is there another solution that I can process and calculate double precision (64 bit) floating point number ? Is switching to another compiler a solution ? |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Mon Nov 17, 2008 11:49 pm |
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| Yes, PCD is supporting double according to the manual. But I didn't yet use it. |
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