Owner`s manual
91
5.1.8 Loop statements
FOR-
TO
NEXT
10
FOR
A
==
1 TO
The
statement number 10 is a command
to
change
10 variable A
and
substitute for values from 1
to
10; the
20
PRINT A
30
NEXT A
value
of
the
first A becomes
1.
Because the value
of
A is
displayed
on
the
eRT
screen by statement number
20,
the
numeral 1 is displayed. Next,
the
value
of
A becomes 2 by
statement number 30, and this loop is repeated. The loop
is repeated in this way until the value
of
A becomes 10.
(At
the point when the loop ends, the value
11
is entered
to
A.)
10 FOR B
==
2 TO A command
to
change variable B
and
substitute for values
8 STEP 3 from 2
to
8 in steps
of
3 (statement number 10).
It
is
also
20 PRINT B
~ble
to
make the STEP value negative and make the
30
NEXT variable smaller each time.
An
example
of
an
overlay
of
the
FOR
-
NEXT
loops
10
FOR
A=1
TO
3 (variables A
and
B). Note
that
B loop is placed inside A
20
FOR
8
S
1.
0
TO
30
J
'"I>
loop. Nesting
of
loops (doubling tripling ... ) is possible
30
PRINT
A,
8
ff
' ,
40
NEXT
8
but
the
inner loop must
be
enclosed within the outer loop.
50
NEXT
A
60
NEXT
B,
A
FOR
-
NEXT
nesting must not
e~ed
15
levels.
70
NEXT
A,
B
t
It
is possible, by the previous double loop, to group
Becomes
error.
statement numbers 40
and
50, as in statement number 60
at
the
left, into one
NEXT
statement.
For
an operand
such as shown in statement number
70, however,
an
error
occurs.