Remote-processing BASIC for the CX-10 Modbus Manuale Utente Scaricare il pdf (Pagina 32)

BASIC PROGRAMMING GUIDE

2-23

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

DESCRIPTION

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

another subroutine.

GOSUB saves the location of the program statement after GOSUB on the C-Stack and immediately transfers

program control to

line number

. When a RETURN is encountered, program execution resumes at program

statement after GOSUB.

GOSUBs 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 ... 27 28 29 30 31 32 33 34 35 36 37 ... 83 84

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Remote-processing BASIC for the CX-10 Modbus Manuale Utente Pagina 32