Commodore PET User Manual page 61

ln calculator mode. as illustrated above. answers are displayed immediately,
on the next line of the display.
Ta use calculator mode for arithmetic operations. vou must begin the line by
typing
?
or PRINT; they are bath print requests. Next type the calculation for
which vou seek an answer. Terminate with a RETURN.
We can illustrate the "format" or "syntax" for a general case calculator
mode entry as follows:
formula
rn
Statements entered in calculator mode do not, and cannat, begin with
line numbers. Later in this chapter we will examine exactly what vou can include
in the "formula" portion of a calculator mode statement.
You can use immediate mode to display the result of a calculation
defined in an earlier statement. Consider the following example:
Fl=rr;+:2
F:EAD'T'.
?A
6.28318531
48