
Online Scripting Reference


subtract
Purpose

Subtracts a value from a variable.

Syntax

subtract var {value}
var: The variable that will be subtracted from.
{value}: The amount the variable will be subtracted by (must be a number).

Notes

This command is a typical way to perform basic mathematics within TWX script.
Since mathematical and logical operators were introduced in v2.00, it is also possible to subtract from a variable using the following method:
setVar $value ($value  1)

Example

# calculate exactly how many trips we're making
# and how much we're carrying on our last trip
setVar $trips $quantity
divide $trips $holds
setVar $x $trips
multiply $x $holds
setVar $lastTrip $quantity
subtract $lastTrip $x
if ($lastTrip = 0)
setVar $lastTrip $holds
else
add $trips 1
end

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