value(required; any valid numeric expression)
A number whose absolute value is to be returned
The absolute value of
value. The data type
is the same as that of the argument passed to the function.
Returns the absolute value of
value is an uninitialized variable, the
return value is 0
Only numeric values can be passed to the Abs function.
This is a Shared member of the Math class, so it can be used without creating any objects.
In this example, the LineLength function is used
to determine the length of a line on the screen. If the line runs
from left to right,
X1 is less than
X2, and the expression
returns the length of the line. If, however, the line runs from right
X1 is greater than
X2, and a negative line length is
returned. As you know, in most circumstances it does not matter which
way a line is pointing; all you want to know is how long it is. Using
the Abs function allows you to return the same
figure whether the underlying figure is negative or positive:
Function LineLength(X2 as Integer) as Integer Dim X1 As Integer X1 = 100 LineLength = Math.Abs(X2 - X1) End Function
Because the Abs function can only accept numeric values, you may want to check the value you pass to Abs using the IsNumeric function to avoid generating an error. This is illustrated in the following code snippet:
If IsNumeric(sExtent) Then Math.Abs(sExtent) ...