Chapter 16 - Qbasic Tutorial - Qbasic Tutorial - Qbasic Tutorial - ^^JPS^^
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Chapter 16 - Qbasic Tutorial

A New Counter

FOR...NEXT is a loop like DO...LOOP, but a FOR...NEXT loop has its own counter built in. Try this:

 CLS
FOR I = 1 TO 10
PRINT I
NEXT I

Much better than our last counter. This one stops on its own after counting to 10.

A Color Chart

Here's a color chart program using a FOR...NEXT loop.

 CLS
FOR I = 1 TO 15
COLOR I, 0
PRINT I; "*** COLOR ***"
NEXT I

STEP

FOR...NEXT can also do "step counting". Try this:

 CLS
FOR I = 2 TO 20 STEP 2
PRINT I
NEXT I

That will count by 2's from 2 to 20. STEP tells QBASIC what to count by. Try changing it to count by 10's from 10 to 100.

FOR...NEXT can also count backwards if you use a negative STEP value:

 CLS
FOR I = 10 TO 1 STEP -1
PRINT I
SLEEP 1
NEXT I
PRINT "BLAST OFF!"

"SLEEP 1" tells QBASIC to wait for one second, then continue.



Source: http://jpsor.ucoz.com
Category: Qbasic Tutorial | Added by: JPSor (2009-02-26) | Author: JPSor
Views: 1119 | Rating: 0.0/0 |
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