WHILE...WEND
Revision as of 17:33, 28 August 2017 by imported>SMcNeill
The WHILE...WEND statement is used to repeat a block of statements while the condition is met.
Contents
Syntax
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.
| 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.
See also
- DO...LOOP
- FOR...NEXT
- UNTIL (condition)
- _CONTINUE
