Solved

What is the difference between Vb.Net decimal and double datatypes?

Posted on 2010-08-16
3
881 Views
Last Modified: 2012-05-10
hi,

Which data type I should use to compare two numeric string values?
I have the below two strings. I need to convert them to decimal/double and find the difference.
Which datatype is more appropriate for this data? Thank you.

dim str1 as string = "5.41245"
dim str2 as string = "4.31245"
0
Comment
Question by:ipjyo
3 Comments
 
LVL 58

Accepted Solution

by:
cyberkiwi earned 250 total points
ID: 33449197
Decimal would be more appropriate

http://visualbasic.about.com/od/usingvbnet/a/decdatatype.htm
http://dotnetkicks.com/csharp/NET_Decimal_vs_float_double_What_s_the_Difference

In short, decimal stores the data exactly up to a certain number of places, whereas doubles store it in binary form as close as a binary can get to the real number.
0
 
LVL 11

Assisted Solution

by:ladarling
ladarling earned 250 total points
ID: 33449257
Single (32 Bit floating point) would be best in this case, actually.
Double is a 64 bit floating point structure, suitible for very large floating point values.
Decimal (128 bit) is not actually a floating point structure:
http://msdn.microsoft.com/en-us/library/ae55hdtk(VS.80).aspx
Quote:

The nonintegral numeric data types are Decimal (128-bit fixed point), Single Data Type (Visual Basic) (32-bit floating point), and Double Data Type (Visual Basic) (64-bit floating point). They are all signed types. If a variable can contain a fraction, declare it as one of these types.

Decimal is not a floating-point data type. Decimal numbers have a binary integer value and an integer scaling factor that specifies what portion of the value is a decimal fraction.
0
 

Author Comment

by:ipjyo
ID: 33449585
Thanks for the clarification.
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now