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le/Field list box. Any of them can easily be inserted into the formula by double
clicking on them.
Important: A variable is valid only from the position in the text at which it is
defined. So, if you insert the formula VOLUME=23*13*7 in the third paragraph
of your document and then try to call out its content or reference it in a formula
in the second paragraph, TextMaker will respond with the error message “Unknown
variable name”.
An application example
A tennis center wants to write invoices for the rentals of its courts. The computer
should calculate the total amount and add 19% tax. Such an invoice would be
written more or less in this (much abbreviated) form:
I N V O I C E
? hours @ ??.??
------------
Total = ??.??
------------
+ 19% tax = ??.??
Amount due = ??.??
------------
Those places indicated by question marks would have to be filled by hand after
calculating the amounts with a pocket calculator. TextMaker takes away this labor.
Let’s assume that the tennis players have rent a court for 2 hours and that each hour
costs $10.00 plus tax:
1. Delete the question mark before “hours” and enter HOURS=2 there with the
Insert > Calculation command.
(This has the following result: Firstly, you have now assigned the variable
HOURS a value of 2; secondly, you have caused the content of this variable (2)
to appear in the text.)
2. To the right, in place of the question marks after “@”, enter the calculation
PRICE=10.
(The same goes here: Firstly, you have now assigned the variable PRICE a
value of 10; secondly, you have caused the content of this variable (10) to appear
in the text.)
362 Calculations in the text Manual TextMaker