WHILE...WEND - QB64Official/qb64 GitHub Wiki

The WHILE...WEND statement is used to repeat a block of statements while the condition is met.

Syntax

WHILE condition . . . WEND

Description

condition is a numeric expression used to determine if the loop will execute.
statements will execute repeatedly while condition is a non-zero value.
EXIT WHILE can be used for emergency exits from the loop.
Use _CONTINUE to skip the remaining lines in the iteration without leaving the loop.
A DO...LOOP can use the same DO WHILE condition to get the same results.
WHILE loops only run if the WHILE condition is True.

Relational Operators:

Symbol	Condition	Example Usage
=	Equal	IF a = b THEN
<>	NOT equal	IF a <> b THEN
<	Less than	IF a < b THEN
>	Greater than	IF a > b THEN
<=	Less than or equal	IF a <= b THEN
>=	Greater than or equal	IF a >= b THEN

Example(s)

Reading an entire file. Example assumes the program has a OPEN as #1

  
OPEN "Readme.txt" FOR INPUT AS #1
WHILE NOT EOF(1)
    _LIMIT 1                                    'limit line prints to one per second 
    LINE INPUT #1, text$
    IF INKEY$ = CHR$(27) THEN EXIT WHILE        'ESC key exits
    PRINT text$
WEND

Clearing the keyboard buffer.


WHILE INKEY$ <> "" : WEND