Remote-processing CAMBASIC Manual do Utilizador descarregar pdf (Página 86)

Commands - 53

GOSUB

Statement

SYNTAX: GOS UB line/label

RETURN

PURPOSE: To branch to and return from a subroutine.

REMARK S: line/label is the beginning of the subroutine.

A subroutine may be called any number of times in a program, and a subroutine may be called from

within another subroutine.

The RETUR N statement causes CAM BASIC to branch back to the statement follow ing the most

recent G OSUB statement. A subroutine may contain m ore than one RET URN statement, should

logic dictate a return at different points in the subroutine. Subroutines may appear anywhere in the

program.

To prevent inadvertent entry into the subroutine, you may put an EN D or GO TO statement in front

of it to direct program control around the subroutine.

NOTE: The execution of the G OSUB statement is independent of the location of the target line in

the program. No run– time search occurs.

When a label is used with GOSUB, a statement cannot follow GOSUB on the same line.

EXAMPLE: 10 GOSUB 40

20 PRINT "Back from subroutine"

30 END

40 PRINT "subroutine";

50 PRINT "in";

60 PRINT "progress"

70 RETURN

RUN

subroutine in progress

Back from subroutine

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 207 208

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