Because of Algebraic Entry
mode,
pressing
G
wrote
the
character
+ in
the
command
line
rather
than
executing
the
command.
Continue
the
expression.
o
SIN
Because
of
Algebraic Entry
mode,
pressing 0
wrote
l in
the
com-
mand
line,
and
pressing
SIN
wrote
::;
I
t~
0::
in
the
command
line,
rather
than
executing
the
commands.
Complete
the
expression
and
put
it
on
the
stack.
30 [
ENTER
I
'""3:-:-------------,
2:
1:
'(15+23)*SIN(30),
RI3rm:JDl!IIIiBDIEI3IEIl:I:J
The
closing
parenthesis
::0
and
the
closing delimiter ' are
added
for
you.
Evaluate
the
expression.
[EVALI
The
expression is
removed
from
the
stack,
and
the
result, 19, is re-
turned
to level
1.
This completes
the
calculation:
(15
+ 23) x sin
30°
= 19.
To
perform
a calculation
that's
already
written
as
an
expression,
such
as in a textbook, it's easier to
key
in
the
expression
and
evaluate it.
Alternatively, to see
the
intermediate
results of your calculation,
or
to
perform
an
on-going
calculation, it's easier to calculate
on
the
stack.
The
results
are
the
same.
The
relationship
between
stack calculations
and
expressions is
demon-
strated
in
chapter
4, "Repeating Calculations."
In
that
chapter
you
calculate
on
the
stack,
using
names
instead
of
numbers,
to
produce
an
expression.
2:
Doing
Arithmetic
35
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