4
Repeating Calculations
In this
chapter
you'll create
an
expression
containing
numerical
vari-
ables
and
then
use
a calculator feature called
the
Solver to evaluate
the
expression for various values
of
the
numerical variables.
In
chapter
2 you
made
a calculation
by
keying
in
an
expression
that
contained
numbers
and
then
evaluating
the
expression.
In
this
chapter
you'll create
an
expression
by
calculating
on
the
stack,
using
names
as
symbolic
arguments.
You'll
use
the
Solver to assign values to
the
vari-
ables
and
evaluate
the
expression. Each
time
you evaluate
the
expression,
the
calculation is
made
with
the
current
values
of
the
vari-
ables.
If
you
change
the
value
of
one
or
more
variables, you
can
simply evaluate
the
expression again to recalculate
with
the
new
values.
In
chapter
3 you
created
numerical
variables
and
a
program
variable.
In this
chapter
you'll create expression variables
and
name
variables.
(Remember,
any
object
can
be
stored
in a variable.) You'll also
learn
about
directories,
which
are sets
of
variables.
Creating
an
Expression
We'll
repeat
the
resistance calculation from
"Chain
Calculations" in
chapter
2,
only this time we'll
use
names,
rather
than
numbers,
as
arguments. Recall
that
the
formula
for
the
circuit is:
1
1
+
1
58
4:
Repeating
Calculations
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