Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 63)

RPBASIC-52 PROGRAMMING GUIDE

2-44

GOSUB

Syntax: GOSUB line number

...

line number program statements

RETURN

Function: Transfers program control to the specified line number. The RETURN causes execution to resume at

the program statement after GOSUB.

Mode: Run

Use: 100 FOR A=1 to 20 : GOSUB 200 : NEXT A : END

200 PRINT A, SQR(A) : RETURN

Cards: All

DESCRIPTION

GOSUB provides subroutine capability within RPBASIC-52 programs. A subroutine may be called from

within another subroutine.

GOSUB saves the location of the program statement after G OSUB on the C-Stack and im mediately transfers

program control to line number. When a RETURN is encountered, program execution resumes at program

statement after GOSUB.

GOSUB s can be nested. The number nesting is limited by available C-Stack RAM, but is usually enough for

at least 30 routines.

GOTO, ON-GOTO, ON-GOSUB

ERROR

C-STACK An unexpected RETURN is encountered or the number of subroutines executed was excessive.

EXAMPLE

10 GOSUB 100

20 PRINT "Back from routine"

30 END

100 PRINT "In subroutine"

110 RETURN

>run

In subroutine

Back from routine

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 63