WHILE
....
WEND
Statement
WHILE
expression
{loop statements}
WEND
Execute a series of statements
in
a loop
as
long as a given condition
is true.
If
expression
is
not zero (true), BASIC executes loop statements until
it encounters a WEND. BASIC returns to the WHILE statement and
~.
checks expression.
If
it is still true, BASIC repeats the process.
If
it
is
not true, execution resumes with the statement following the WEND
statement.
WHILE/WEND loops may
be
nested to any level. Each WEND
matches the most recent WHILE.
An
unmatched WHILE statement
causes a "WHILE without WEND" error, and
an
unmatched WEND
causes a "WEND without WHILE" error.
Sample Program
90
'BUBBLE
SORT ARRAY A$
100
FLIPS=l
'FORCE
ONE
PASS THRU LOOP
110
WHILE
FLIPS
115
FLIPS=0
120
FOR
1=1
TO
J-l
130
IF
A$(l):>A$(I+l>THEN
SWAP
A$(l),
A$(I+l):
FLIPS=l
1
L10
NE){T I
150
WEND
This program sorts the elements
in
array
A$.
Control falls out of the
WHILE loop when
no
more SWAPS are performed
on
line 130.
2-178
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