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

See Also