PRB: "Overflow" with Integer Division and MOD Operator (205053)
The information in this article applies to:
- Microsoft Visual Basic Learning Edition for Windows 5.0
- Microsoft Visual Basic Learning Edition for Windows 6.0
- Microsoft Visual Basic Professional Edition for Windows 5.0
- Microsoft Visual Basic Professional Edition for Windows 6.0
- Microsoft Visual Basic Enterprise Edition for Windows 5.0
- Microsoft Visual Basic Enterprise Edition for Windows 6.0
- Microsoft Visual Basic Standard Edition, 32-bit, for Windows 4.0
- Microsoft Visual Basic Professional Edition, 16-bit, for Windows 4.0
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows 4.0
- Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows 4.0
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows 4.0
This article was previously published under Q205053 SYMPTOMS
When using a number larger than 2,147,483,647 (or smaller than -2,147,483,648) with the Mod operator or the integer division operator (\), you receive the following error message:
Run Time Error '6':
Overflow
CAUSE
The Visual Basic Help topic for the Mod operator and the integer division operator (\) explains that if floating point numbers are used in the expression, they are converted to Longs first. Thus, if the floating point number is greater than the maximum value of a Long (2,147,483,647), or less than the minimum value for a long (-2,147,483,648), an overflow error will occur.
RESOLUTION
The following code demonstrates how to perform integer division and modulo
arithmetic when the size of an operand is sufficiently large to cause overflow:
Dim dblX as Double
Dim dblY as Double
dblX = 2147483648 ' numerator
dblY = 123 ' denominator
' round off the numerator and denominator (ensure number is .0)
dblX = INT(dblX + .5)
dblY = INT(dblY + .5)
' Emulate integer division
MsgBox FIX(dblX / dblY)
' Emulate modulo arithmetic
MsgBox dblX - ( dblY * FIX(dblX / dblY) )
STATUS
This behavior is by design.
| Modification Type: | Major | Last Reviewed: | 6/28/2004 |
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| Keywords: | kberrmsg kbprb KB205053 |
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