Atlanta Custom Software Development 

 
   Search        Code/Page
 

User Login
Email

Password

 

Forgot the Password?
Services
» Web Development
» Maintenance
» Data Integration/BI
» Information Management
Programming
  Database
Automation
OS/Networking
Graphics
Links
Tools
» Regular Expr Tester
» Free Tools

Manually coerce to Long all Integer expressions that might overflow
[ All Languages » VB »  Math]

Total Hit ( 2245)

Rate this article:     Poor     Excellent 

 Submit Your Question/Comment about this article

Rating


 


This is something that expert VB developers know very well, yet every know and then an otherwise perfect VB app stops with a fatal overflow error because of Integer overflow. Consider the following code:

Click here to copy the following block
Dim LongVariable As Long
LongVariable = 256 * 256

This raises the error "Runtime Error 6, Overflow", even though the target variable can accomodate the result. The problem, in fact, is that when multiplying to Integer values VB assumes that the result is also an Integer. If you aren't sure that this is correct, just force either operand to be a Long, as in:

Click here to copy the following block
Dim LongVariable As Long
LongVariable = 256 * 256&

or:

Click here to copy the following block
Dim LongVariable As Long
LongVariable = 256 * CLng(256)



Submitted By : Nayan Patel  (Member Since : 5/26/2004 12:23:06 PM)

Job Description : He is the moderator of this site and currently working as an independent consultant. He works with VB.net/ASP.net, SQL Server and other MS technologies. He is MCSD.net, MCDBA and MCSE. In his free time he likes to watch funny movies and doing oil painting.
View all (893) submissions by this author  (Birth Date : 7/14/1981 )


Home   |  Comment   |  Contact Us   |  Privacy Policy   |  Terms & Conditions   |  BlogsZappySys

© 2008 BinaryWorld LLC. All rights reserved.