$ZABS returns the absolute value of n.
Any number. Can be specified as a value, a variable, or an expression. The expression is evaluated, and the result converted to a positive value. Multiple plus and minus signs are permitted. Leading and trailing zeros are deleted.
A non-numeric string is evaluated as 0. For evaluation of mixed numeric strings and non-numeric strings, refer to Strings As Numbers in Using ObjectScript.
The following example returns the absolute value of the number you supply:
READ "Input a number: ",num SET abs=$ZABS(num) WRITE "The absolute value of ",num," is ",abs
Operators in Using ObjectScript