Remote-processing BASIC for the CX-10 Modbus Manual de usuario descargar pdf (Pagina 45)

BASIC PROGRAMMING GUIDE

2-36

ON GOSUB

Syntax: ON

expr

GOSUB

line0[,line1[,line2...]]

Where:

expr

= 0 to number of subroutines after GOSUB

line

n = subroutine line number to execute

Function: Calls subroutine based on value of

expr

Mode: Run

Use: ON A GOSUB 100, 200, 500

DESCRIPTION

The ON-GOSUB instruction conditionally branches to one of several possible subroutines depending on the

value of

expr

must evaluate to greater than or equal to zero. If

expr

evaluates to zero, execution

branches to

line0

. When

expr

evaluates to one, execution branches to

line1

, etc. If necessary,

expr

is truncated

to an integer.

ON-GOSUB saves the location of the program statement after ON-GOSUB on the control stack and

immediately transfers program control to the selected subroutine. The subroutine is then executed. When

Basic encounters the RETURN instruction, program execution resumes at the program statement after ON-

GOSUB. ON-GOSUB instructions can be nested.

One or more of

line

n may be the same, to execute the same subroutine with different

expr

values. At least

one

line

n must be provided.

line

n can be in any order.

ON GOTO, GOSUB, RETURN

ERRORS

BAD ARGUMENT The value of

expr

is less than 0

BAD SYNTAX The

expr

value is larger than the number of subroutine locations provided, or commas

were omitted between {subr n line#} values, or no subroutine locations were given.

C-STACK Attempted recursion caused control stack overflow

EXAMPLE

10 P=2

20 ON P GOSUB 1000, 3000, 2000

30 END

1000 PRINT "Line 1000"

1010 RETURN

2000 PRINT "Line 2000"

2010 RETURN

3000 PRINT "Line 3000:

3010 RETURN

>run

Line 3000

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 83 84

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Remote-processing BASIC for the CX-10 Modbus Manual de usuario Pagina 45

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