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1) Formulas
For a surface area S, volume V and one side A, S and V for a regular octahedron are defined as:
√
S = 2
3A
2) Programming
Creation a program based on calculation formulas is known as "programming". Here a program will be
created based upon the formulas given above. The basis of a program is manual calculation, so first of all,
consider the operational method used for manual calculation.
Surface area (S): 2
Volume (V):
In the above example, numeric value A is used twice, so it should make sense to store it in memory A before
the calculations.
Numeric value A
√
2
x
2
√
With this unit, the operations performed for manual calculations can be used as they are in a program. Once
program execution starts, it will continue in order without stopping, therefore, commands are required to
request the input of data and to display results. The command to request data input is "?", while that to display
results is "
A "?" within a program will cause execution to stop temporarily and a "?" to appear on the display as the unit
waits for data input. This command cannot be used independently, and is used together with
→
"
ALPHA
?
When "?" is displayed, calculation commands and numeric values can be input within 127 steps.
The "
" command causes program execution to stop temporarily and the latest formula result or
°'
''
alphanumeric characters and symbols to be displayed. This command is used to mark positions in formulas
where results are to be displayed. Since programs are ended and their final results displayed automatically, this
command can be omitted at the end of program. However, if the BASE-N mode is specified for base
conversion during a program, do not omit final "
Here these two commands will be used in the previously presented procedure:
→
ALPHA
?
Input to memory A
÷
√
2
3
3) Program
The storage of programs is performed in the WRT mode which is specified by pressing
MODE
2
when
MODE
2
steps is indicated. The number of remaining steps is decreased when programs are input or when memories are
expanded. If no programs have been input and the number of memories equals 26 (the number of memories at
initialization), the number of usable steps should equal 400. The larger figures located below indicate the
program areas. If the letter "P" is followed by the numbers 0 through 9, it indicates that there are no programs
stored in areas P0 through P9. The blinking zero here indicates the current program area is P0.
Areas into which programs have already been stored are indicated by "_" instead of numbers.
- 48 -
√
2
V =
2
3
√
3
Numeric value A
x
x
÷
√
2
3
Numeric value A
x
→
A
ALPHA
EXE
3
x
EXE
ALPHA
A
x
2
÷
3
3
x
ALPHA
A
x
y
".
memory name". To store a numeric value in memory A, for example: ? → A
2
√
:
x
ALPHA
A
3 (
x
ALPHA
A
x
y
WRT
PO123456789
are pressed, the system mode changes to the WRT mode. Then, the number of remaining
WRT
PO12_34_6789
A
3
x
EXE
2
3
x
y
EXE
. . . . . . . . . . . . . . . . . . . S
. . . . . . . . . . . . . . . . . . V
EXE
".
3
x
ALPHA
A
x
2
A
DisplayS
omitted)
MODE
Number of remaining steps
400
226
Copyright L
EXIBOOK
→
as
.
2
2002
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