Could you please suggest - sum two doubles

Question

0.00/5 (No votes)

See more:

double dr = 495494.3948402 + 3740.9729811 == 499235.36782130005 (!) correct is 499235.3678213

double dr = 0.1111111 + 0.2222222 == 0.3333333 (!) correct

how to owercome?

What I have tried:

double dr = 0.1111111 + 0.2222222 == 0.3333333 (!) correct

Posted 16-Mar-16 0:25am

po_saa

Updated 16-Mar-16 0:40am

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)

F-ES Sitecore · Accepted Answer · 2016-03-16T00:31:00

Solution 1

double is an approximation of the number, the maths is quick but not guaranteed to be 100% accurate. If you need accuracy use decimal

C#

decimal dr = 495494.3948402M + 3740.9729811M;

Posted 16-Mar-16 0:31am

F-ES Sitecore

Sascha Lefèvre · Accepted Answer · 2016-03-16T00:35:00

Arithmetic with Double and Float (=Single) is inexact "by design". If you need exact floating point arithmetic then use Decimal, that's what it's been designed for.

The advantages of Double and Float in comparison with Decimal are that the computation is faster and that the range of numbers that can be represented is larger.

Jochen Arndt · Accepted Answer · 2016-03-16T00:40:00

Most floating point numbers can not be represented exactly on computer systems and performing operations usually leads to additional errors. See Round-off error - Wikipedia, the free encyclopedia[^] and The Floating-Point Guide - What Every Programmer Should Know About Floating-Point Arithmetic[^].

Could you please suggest - sum two doubles

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0