Sub (function)
Subtracts one expression from another. This is the functional equivalent of the - operator.
Syntax
sub( expression, expression2 ) 
integer, measure, currency value
Arguments
expression1, expression2
Integer, measure or currency values. Both expressions must be the same type. The returned value is set according to the type of the parameters.
Code Sample Example
Example 1 and Example 2 illustrates both ways of subtracting numbers.
Example 1
show(inttostr(2-2))
Example 2
show(floattostr(sub(4.7,2.1)))