Question

How to check if integer addition will overflow in VB.NET

Answer 1

Imports System

Class OverflowCheck
    Public Shared Function AddingWillOverflow(ByVal x As Integer, ByVal y As Integer) As Boolean
        Return ((x > 0) AndAlso (y > Integer.MaxValue - x)) OrElse ((x < 0) AndAlso (y < Integer.MinValue - x))
    End Function

	Public Shared Sub Main()
        Dim x As Integer = 39839299, y As Integer = 1472783642
        Console.WriteLine(If(AddingWillOverflow(x, y), "true", "false"))
			
        x = 1338839299
        y = 1872783642
        Console.WriteLine(If(AddingWillOverflow(x, y), "true", "false"))
    End Sub
End Class


' run:
'
' false
' true
'

 

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