High precision in double numbers

Question

4.00/5 (1 vote)

See more:

Hi
double type has 64 bit width and can hold number as small as 1e-308.
i want a data type even smaller than double.

i read in help that long double has 80 bit width and can store as small as 1e-4000, but in VC, when i declare a variable with this type, it threats as double type.

where is the problem?

thanks

Posted 23-Dec-12 8:43am

Moharram

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Philippe Mori · Answer 1 · 2012-12-25T04:00:00

Floating points bigger than a double are not as standardized as float or double. It is much more compiler and Platform dependant.

http://en.wikipedia.org/wiki/Long_double[^]

If you really need more precision, you can either look for another compiler like the one from Intel or look for a library.

CPallini · Answer 2 · 2012-12-23T09:35:00

Solution 2

You might use a library (see, for instance, Arbitrary-precision arithmetic libraries at Wikipedia[^]).

Posted 23-Dec-12 9:35am

CPallini

v2

Jibesh · Answer 3 · 2012-12-23T09:08:00

Solution 1

MSDN[^] says double and long double are same.

but CPP reference says you can define a long double by putting a 'L' at the end read more at Double and Long Double[^]

Posted 23-Dec-12 9:08am

Jibesh