Evaluates which of the two numbers is higher
_Max ( $iNum1, $iNum2 )
|Success:||the higher of the two numbers.|
|Failure:||0 and sets the @error flag to non-zero|
|@error:||1 - $iNum1 isn't a number.
2 - $iNum2 isn't a number.
This function works with floats as well as integers.