Manually coerce to Long all Integer expressions that might overflow [ All Languages » VB »  Math] Total Hit ( 2947) 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)

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