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 ABS()
 Return the absolute value of a numeric expression
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 Syntax

     ABS(<nExp>) --> nPositive

 Arguments

     <nExp> is the numeric expression to evaluate.

 Returns

     ABS() returns a number representing the absolute value of its argument.
     The return value is a positive number or zero.

 Description

     ABS() is a numeric function that determines the magnitude of a numeric
     value independent of its sign.  It lets you, for example, obtain the
     difference between two numbers as a positive value without knowing in
     advance which of the two is larger.

     As a formalism, ABS(x) is defined in terms of its argument, x, as
     follows: if x >= 0, ABS(x) returns x; otherwise, ABS(x) returns the
     negation of x.

 Examples

     .  These examples show typical results from ABS():

        nNum1 := 100
        nNum2 := 150
        ? nNum1 - nNum2                // Result: -50
        ? ABS(nNum1 - nNum2)           // Result: 50
        ? ABS(nNum2 - nNum1)           // Result: 50
        ? ABS(-12)                     // Result: 12
        ? ABS(0)                       // Result: 0

 Files:  Library is CLIPPER.LIB.