WHILE...WEND - mkilgore/QB64pe GitHub Wiki
The WHILE...WEND statement is used to repeat a block of statements while the condition is met.
- 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 |
Example 1: Reading an entire file. Example assumes the program has a file opened as #1
'' ''
OPEN "Readme.txt" FOR INPUT (file mode) AS #1
WHILE...WEND NOT EOF(1)
_LIMIT 1 'limit line prints to one per second
LINE INPUT (file statement)1, text$
IF INKEY$ = CHR$(27) THEN EXIT WHILE 'ESC key exits
PRINT text$
WEND '' ''
|
Example 2: Clearing the keyboard buffer.
'' '' WHILE INKEY$ <> "" : WEND '' '' |
- DO...LOOP
- FOR...NEXT
- UNTIL (condition)
- _CONTINUE
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