GOSUB

Function

GOSUB causes execution to jump to a Basic subroutine located elsewhere in the applications program.

Syntax

GOSUB line number

GOSUB numeric expression

Examples

GOSUB 150

causes program execution to jump to a subroutine located at 150.

The argument can also be an argument or expression, for example:

GOSUB SI

or

GOSUB SI+100*A

This is illustrated by the program sequence:

10 INPUT A
20 SI=1000
30 GOSUB SI+100*A
40 STOP
1000 PRINT "THIS IS SUBROUTINE 1"
1010 RETURN
1100 PRINT "THIS IS SUBROUTINE 2"
1110 RETURN

etc.

If the number 0 is entered in line 10, the program will perform subroutine 1. Input of the number 1 will cause subroutine 2 to be executed.

Remarks

A subroutine must always be terminated by a RETURN statement. Program execution then continues from the statement immediately after the GOSUB. GOSUB always requires a line number as an argument.