UniBasic Commands Reference - Rocket Software

NUM
Syntax
NUM(expr)
Description
The UniBasic NUM function determines if an expression is numeric. If expr is
numeric, NUM returns 1. Otherwise, it returns 0. expr can be any valid UniBasic
expression. The NUM function returns 0 for any multibyte character.
With null value handling on, this function returns 1 for the null value.
The nonnumeric characters in the following table produce a result of 1.
Examples
In the following example, the program segment prints 0 because VAR contains alphabetic
characters:
VAR = 'ABC'
PRINT NUM(VAR)
In the next example, the program segment prints 1 because VAR contains an integer:
VAR = -123
PRINT NUM(VAR)
1-484 UniBasic Commands Reference
Character Description
+ Plus sign
- Negative sign
. Decimal point
Nonprinting Null value
Nonnumeric Characters