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Re: Value: why not float support? [message #28417 is a reply to message #28401]

Wed, 01 September 2010 13:52

gprentice is currently offline

gprentice
Messages: 260
Registered: November 2005
Location: New Zealand

Experienced Member

Quote:

Are you aware that C/C++ always performs all FP arithmetics in double precision by standard definition?

As far as I can see this is not true. The C++ standard incorporates part of the ISO C standard by reference, including 5.2.4.2.2 where this is specified. I don't have the C90 standard but the C99 standard specifies that FLT_EVAL_METHOD IN float.h (cfloat in C++) has value zero if the calculation precision is the same as the operand precision and value 1 if the calculation precision is double. FLT_EVAL_METHOD wasn't part of C90 but it's very unlikely that C90 required double precision and C99 doesn't.

Also, double is required to have at least 10 significant decimal digits (DBL_DIG in cfloat) and floats at least 6 digits(FLT_DIG).

Graeme

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[Message index]

		Value: why not float support? By: kohait00 on Mon, 30 August 2010 10:54
		Re: Value: why not float support? By: mirek on Tue, 31 August 2010 15:49
		Re: Value: why not float support? By: kohait00 on Tue, 31 August 2010 16:11
		Re: Value: why not float support? By: mirek on Tue, 31 August 2010 18:49
		Re: Value: why not float support? By: kohait00 on Tue, 31 August 2010 22:02
		Re: Value: why not float support? By: gprentice on Wed, 01 September 2010 13:52
		Re: Value: why not float support? By: kohait00 on Wed, 01 September 2010 16:13
		Re: Value: why not float support? By: mirek on Thu, 02 September 2010 09:40
		Re: Value: why not float support? By: kohait00 on Thu, 02 September 2010 11:24
		Re: Value: why not float support? By: mirek on Mon, 06 September 2010 10:40
		Re: Value: why not float support? By: kohait00 on Mon, 06 September 2010 11:54
		Re: Value: why not float support? By: kohait00 on Mon, 13 December 2010 15:47
		Re: Value: why not float support? By: mirek on Wed, 15 December 2010 16:15
		Re: Value: why not float support? By: kohait00 on Wed, 15 December 2010 16:41
		Re: Value: why not float support? By: rylek on Mon, 20 December 2010 23:08
		Re: Value: why not float support? By: kohait00 on Tue, 21 December 2010 08:20
		Re: Value: why not float support? By: mirek on Fri, 24 December 2010 12:39
		Re: Value: why not float support? By: kohait00 on Fri, 24 December 2010 13:55
		Re: Value: why not float support? By: mirek on Sat, 25 December 2010 10:48
		Re: Value: why not float support? By: kohait00 on Sun, 26 December 2010 11:28
		Re: Value: why not float support? By: mirek on Mon, 27 December 2010 13:20
		Re: Value: why not float support? By: kohait00 on Mon, 27 December 2010 14:28
		Re: Value: why not float support? By: mirek on Mon, 27 December 2010 14:44
		Re: Value: why not float support? By: kohait00 on Tue, 28 December 2010 13:47
		Re: Value: why not float support? By: kohait00 on Mon, 07 March 2011 14:31
		Re: Value: why not float support? By: mirek on Mon, 07 March 2011 23:04
		Re: Value: why not float support? By: kohait00 on Tue, 08 March 2011 08:33

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