EMMA 02

BASIC

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GOSUB

Format: GOSUB expr

Supported by: COMX BASIC V1.00, Floating Point BASIC 2.2, Pecom 32 BASIC, Pecom 64 BASIC 1.0 and 4.0, Quest Super BASIC 1.4, 3.0, 5.0 and 6.0, RCA BASIC3 V1.1, Telmac SBASIC v 24.3

Similar commands: -

This statement (subroutine call) is identical to the GOTO statement with the exception that the program remembers where the GOSUB occurred. When BASIC encounters a RETURN statement, it will return to the statement following the last GOSUB statement executed. In this way subroutines may be nested as deep as memory will allow (the stack grows as the number of nested GOSUB's grows). An example of the GOSUB statement is

For example

5 A=2000
10 GOSUB 1000: GOSUB 1000
20 GOSUB A
30 END 
1000 PR "DONE--"
1010 RETURN
2000 PR "FINISHED" : GOSUB 3000: GOTO 1010
3000 PR "COMPLETE": RETURN
This example results in the following being printed.

DONE--
DONE--
FINISHED
COMPLETE