52
4-1
Writing Programs
The example shown below
is
a program using BASIC in which
the
value
of
y
is
calculated with the formula y =
2x
2
+ 9
lx
+ 125
by
inputting the value
of
x.
1 0 I N
PUT''
x =
''
, X
20
Y=2*Xt2+91*X+125
30
PR I
NT''y
=''
;Y
40
GOTO
10
50
END
A BASIC program
is
a collection
of
"lines" with each line being composed
of
numerals (integers from 1
to
9999
can be used) called line numbers and state-
ments (commands such
as
INPUT
or
formulas such
as
Y=2*X t
2+91
*
X + 1 2 5
).
The program will also be executed in successive order starting from
the smallest line number.
We
will start
now
by
inputting
the
above program.
Press
~ITJ.
The symbol "WRT" should appear in the upper part
of
the
display.
BUZZER
Blinks_J
Symbol indicating
the
r"WRT"
mode.
DEG
WRT
Status
of
the
program areas
Remaining capacity
of
the
free area.
I
r:
s 2 a
The program
must
be
written only when in
the
WRT mode as shown above.
The large characters
"F
(11
2 3 4 5 6 7
:::
'3"
indicate the usage state
of
the
program areas.
*The
computer
is
provided with 10 program areas
(PO
~
P9) in which multiple
programs can be stored separately. The program area can be changed
by
press-
ing any number key from
8
to
8 after pressing
§1
.
The blinking number indicates
the
program area currently specified. The num-
bers displayed indicate open areas.
If
a program has been written,
that
area num-
ber changes
to
a cursor (- ).
In
the
display shown below for example, the area
specified
is
PS and programs are already written in areas
Pl
, P8 and P9.
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