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(each separated by a space) or they can be in history. For
example, to multiply by 3, you could enter:
3
SzX
s
on the entry line and then enter the operator (
). Thus your
entry line would look like this before entering the operator:
However, you could also have entered the arguments separately
and then, with a blank entry line, entered the operator (
s
).
Your history would look like this before entering the operator:
If there are no entries in history and you enter an operator or
function, an error message appears. An error message will also
appear if there is an entry on a stack level that an operator needs
but it is not an appropriate argument for that operator. For
example, pressing
f
when there is a string on level 1 displays
an error message.
An operator or function will work only on the minimum number
of arguments necessary to produce a result. Thus if you enter on
the entry line 2 4 6 8 and press
s
, stack level 1 shows 48.
Multiplication needs only two arguments, so the two arguments
last entered are the ones that get multiplied. The entries 2 and 4
are not ignored: 2 is placed on stack level 3 and 4 on stack level
2.
Where a function can accept a variable number of arguments,
you need to specify how many arguments you want it to include
in its operation. You do this by specifying the number in
parentheses straight after the function name. You then press
E
to evaluate the function. For example, suppose your
stack looks like this:
46
Reverse Polish Notation (RPN)
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