Solved

Decrease Int16 variable with 1

Posted on 2010-09-22
8
643 Views
Last Modified: 2012-05-10
Why does I get the error "Cannot convert type int to short" when doing like this:

Int16 test = 100;
test = test - 1;


This works, but I need to know why the code above fails:

Int16 test = 100;
test--;

(test is 99)
0
Comment
Question by:webressurs
  • 4
  • 3
8 Comments
 
LVL 21

Expert Comment

by:chapmanjw
ID: 33738271
In code "1" is an Int32 I believe.

Try one of these:

Int16 test = 100;
Int16 test2 = 1;
test = test - test2;

Or

Int16 test 100;
test = test - (Int16)1;

or

Int16 test 100;
test = test - Convert.ToInt16(1);
0
 
LVL 21

Expert Comment

by:chapmanjw
ID: 33738278
By the way, short in C# = Int16 and int in c# = Int32.
0
 
LVL 1

Author Comment

by:webressurs
ID: 33738396
Get the same error ("Cannot convert type int to short") on this:

Int16 test = 100;
Int16 test2 = 1;
test = test - test2;

...and this:

Int16 test = 100;
test = test - (Int16)1;

...and this:

Int16 test = 100;
test = test - Convert.ToInt16(1);
0
Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

 
LVL 21

Expert Comment

by:chapmanjw
ID: 33738463
Sorry, wasn't in front of a machine where I could test it ;-P

But, this should work:

short test 100;
test = test - (short)1;
0
 
LVL 1

Author Comment

by:webressurs
ID: 33738577
Still same error here... Hmmm :)
But, I changed the variable to int and that works good enought:

int test = 100;
test = test - 1;
0
 
LVL 21

Accepted Solution

by:
chapmanjw earned 250 total points
ID: 33738676
Ok.  

The reason Int in C# equates to an Int32, is because it is the most used variation of an integer.

You would only really need to use shorts (Int16) or longs (Int64) if you had a requirement to work with a database that specified them.  Otherwise, it doesn't really affect anything to simply use Int (Int32).
0
 
LVL 9

Assisted Solution

by:jhshukla
jhshukla earned 250 total points
ID: 33739299
http://msdn.microsoft.com/en-us/library/ybs77ex4.aspx

According to the above link, the result of adding two shorts is an int. So use the following:

test = (short)(test - 1);
0
 
LVL 1

Author Closing Comment

by:webressurs
ID: 33741704
Thank you!
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
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…

856 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