118
CHAPTER
6
Command
Reference
I F
Conditi~nal
express~on
TH
EN
{Statement
[ :
statement]*}
®
Companson expression Branched location
B h d
I
. { Line No.
* ranc e ocat1on # N
program area
o.
Function:
When a conditional expression
is
true, the statements after THEN are executed.
Also, when a statement after THEN
is
a branched location, branching
is
per-
formed.
Parameter:
Conditional expression:
Line No.:
Program area No.:
Explanation:
Used in the form
of
a comparison expression.
1
to
9999.
0
to
9.
1) When the conditional expression
is
true, the statements after THEN are
executed
or
branching
is
performed.
2)
When the conditional expression is false,
the
next line
is
executed.
3)
The related operators used in a conditional expression:
The item on the left
is
equal
to
the item
on
the right.
\ The item on
the
left
is
not
equal
to
the item
on
the right.
< The item on
the
right
is
larger than
that
on
the left.
> The item on
the
right
is
smaller than
that
on the
lef
t.
~ The item on
the
right
is
larger than or equal
to
that
on
the left.
2 The item on
the
right
is
smaller than
or
equal
to
that
on the left.
4)
When two or more conditional expressions exist, several IF
~
THEN state-
ments can be written sequentially.
IF-THEN
IF-THEN
........................
..
.
5) Since the statements after THEN in one line will be executed only after all
conditional expressions are true, statements
to
be executed regardless
of
the
conditional expression must be written
as
a multistatement before IF
or
on
a
separate line.
*When a statement exists after THEN,
";"
can be used instead
of
THEN.
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