Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 53)

RPBASIC-52 PROGRAMMING GUIDE

2-34

DO-WHILE

Syntax: DO

{program statements}

WHILE {relational expr}

Function: Executes {program statements} w hile {relational expr} is true.

Mode: Run

Use: 100 CLEAR TICK(0) : DO : PRINT TICK(0) : WHILE TICK(0)<10

Cards: All

DESCRIPTION

The {program statem ents} between DO and WHILE are executed once, regardless of the {relational expr}

result. At WH ILE the {relational expr} is evaluated. If true, all {program statements} are executed again,

and the test is repeated. If false, execution continues at the program statement after WHILE. DO-WHILE

and DO-UNTIL loops can be nested.

DO-UNTIL, FOR-TO-STEP-NEXT

EXAMPLE

The following program stays in a DO-UNTIL loop until a line has changed.

10 ON LINE 0,0,500

20 DO

30 WHILE C=0

40 PRINT "Line 0 changed. Is now a",line(0)

50 C=0

60 GOTO 20

500 C=1

510 RETURN

>run

Line 0 changed. Is now a 0

Line 0 changed. Is now a 1

Line 0 changed. Is now a 0

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 53