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U++ can't handle float to string and back for large numbers [message #47765]

Tue, 21 March 2017 09:57

cbpporter
Messages: 1428
Registered: September 2007

Ultimate Contributor

I'm working on a library that tries to do a lot for things, including float work.

I real Maths work, where you do more than 1.0 + 2.0, you often encounter large numbers.

I noticed that U++ can't handle the extremes at all, both by debugging the float values and by using CParser extensively. I looked over CParser code extensively and have not yet found the problem. Most if not all the float to string bits form Core have this problem.

Even something as simple as:

	double d = 1.79769e+302;
	printf("%e\n", d);   // good
	Cout() << d << "\n"; // wrong

Is is wrong at it gets worse as worse as you go up to e303 and up to e308.

I am currently investigating this, since U++ problems with "atof" are also my libraries problems by inheritance.

PS: My official release day was planned for Wednesday, but it will probably be moved back to Friday.

Why do such weird problems only happen before release day? Laughing

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[Message index]

		U++ can't handle float to string and back for large numbers By: cbpporter on Tue, 21 March 2017 09:57
		Re: U++ can't handle float to string and back for large numbers By: cbpporter on Tue, 21 March 2017 10:28
		Re: U++ can't handle float to string and back for large numbers By: cbpporter on Tue, 21 March 2017 10:52
		Re: U++ can't handle float to string and back for large numbers By: mirek on Sat, 15 April 2017 11:25
		Re: U++ can't handle float to string and back for large numbers By: cbpporter on Thu, 20 April 2017 10:44
		Re: U++ can't handle float to string and back for large numbers By: mr_ped on Tue, 21 March 2017 21:35
		Re: U++ can't handle float to string and back for large numbers By: cbpporter on Wed, 22 March 2017 07:27

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