how to store a very small number

Question

1.00/5 (1 vote)

See more:

Hello.

I have a formula to calculate weights of some numbers in C#. I have 9 weights. Sum of these weights are 1. So,These are too small.
For instance after calculating these weights, the result is something like below:
1/17 , 1/17 ,1/17 ,1/17 ,1/17 ,1/17 ,1/17 ,1/17 ,9/17
When I want to store these weights in a parameter with double type, the stored values will be:
0.0 , 0.0 , 0.0 , 0.0 , 0.0 , 0.0 , 0.0 , 0.0 , 0.0
The problem is that I need the exact value of these weights to use in another formula, and they are too important in that formula. Sum of them should be 1.
What can I do for solving this problem? Please help me.

Thanks a lot.

Posted 21-Sep-14 22:15pm

k5_ce

Add a Solution

Comments

Rob Philpott 22-Sep-14 4:50am

Why would they be 0.0 each time??

You *could* find yourself in the situation where the sum of all the parts isn't exactly 1 due to imperfect precision, but the thing to do there is probably just adjust the last one by some stupidly small amount to deliver an exact 1.

k5_ce 22-Sep-14 8:46am

Thanks for your answer. Regards

1 solution

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)

Richard MacCutchan · Answer 1 · 2014-09-21T22:49:00

Solution 1

The float or double types will easily hold values such as the above, see http://msdn.microsoft.com/en-us/library/678hzkk9.aspx[^] for the range that a double can hold.

Posted 21-Sep-14 22:49pm

Richard MacCutchan

Comments

k5_ce 22-Sep-14 8:47am

Thanks for your answer. Regards