WHILE...WEND - QB64 Wiki

WHILE...WEND

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


Contents

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 in QB64 only.
  • 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
<  Less than  IF a < b THEN
>  Greater than  IF a > b THEN
=  Equal  IF a = b THEN
<=  Less than or equal  IF a <= b THEN
>=  Greater than or equal  IF a >= b THEN
<>  NOT equal  IF a <> b THEN


Examples

Example 1: Reading an entire file. Example assumes the program has a file opened 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

Example 2: Clearing the keyboard buffer.

WHILE INKEY$ <> "" : WEND


See also



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