USER-DEFINED PROCEDURES: RETURN VALUE (USING PARAM$())

This example will demonstrate how to define procedures with one or more parameters. Parameters are a way to give informations to the procedure. Moreover, it shows one way to retrieve the returning value of the procedure. There are several. Anyway, the parameters should be considered like local variables that are feeded by the caller. The returning value should be considered as a value than could be used by the caller. The example will implement a procedure that merges three strings all togheter.

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SOURCE CODE ()

    CLS
    
    PROCEDURE joinString[a$,b$,c$ ]
        PRINT "joinString called with:"
        PRINT " a$ = ";a$
        PRINT " b$ = ";b$
        PRINT " c$ = ";c$
    END PROC[a$+b$+c$]
    
    joinString["ONE","TWO","THREE"]

    PRINT "joinString[ONE,TWO,THREE] = ";PARAM$(joinString)

How to compile and run the example

The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile each single example with just one click.



Are instructions for your specific home computer / console missing? First of all, check if your computer is supported by clicking here. If so, since ugBASIC is a language which does not provide abstractions, it is possible that this example will not work on your target. If you think this is an issue, please click here.

Amstrad CPC 464, Amstrad CPC 6128, Amstrad CPC 664

In order to compile the example, type this command on the command line:

Linux

ugbc.cpc -O dsk -o procedures_param_01.dsk procedures_param_01.bas

Windows

ugbc.cpc.exe -O dsk -o procedures_param_01.dsk procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Atari 1200XL, Atari 130XE, Atari 600XL, Atari 65XE, Atari 800XE, Atari 800XL, Atari XEGS

In order to compile the example, type this command on the command line:

Linux

ugbc.atarixl -O xex -o procedures_param_01.xex procedures_param_01.bas

Windows

ugbc.atarixl.exe -O xex -o procedures_param_01.xex procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Atari 400, Atari 800

In order to compile the example, type this command on the command line:

Linux

ugbc.atari -O xex -o procedures_param_01.xex procedures_param_01.bas

Windows

ugbc.atari.exe -O xex -o procedures_param_01.xex procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Coleco Vision, Dina (Chuang Zao Zhe 50), SpectraVideo SV-603 VGA

In order to compile the example, type this command on the command line:

Linux

ugbc.coleco -O rom -o procedures_param_01.rom procedures_param_01.bas

Windows

ugbc.coleco.exe -O rom -o procedures_param_01.rom procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Commodore 128 (CPU 8502)

In order to compile the example, type this command on the command line:

Linux

ugbc.c128 -O prg -o procedures_param_01.prg procedures_param_01.bas

Windows

ugbc.c128.exe -O prg -o procedures_param_01.prg procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Commodore 64, Commodore Executive 64

In order to compile the example, type this command on the command line:

Linux

ugbc.c64 -O prg -o procedures_param_01.prg procedures_param_01.bas

Windows

ugbc.c64.exe -O prg -o procedures_param_01.prg procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Dragon 32

In order to compile the example, type this command on the command line:

Linux

ugbc.d32 -O bin -o procedures_param_01.bin procedures_param_01.bas

Windows

ugbc.d32.exe -O bin -o procedures_param_01.bin procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Dragon 64

In order to compile the example, type this command on the command line:

Linux

ugbc.d64 -O bin -o procedures_param_01.bin procedures_param_01.bas

Windows

ugbc.d64.exe -O bin -o procedures_param_01.bin procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Olivetti Prodest PC128, Thomson MO6

In order to compile the example, type this command on the command line:

Linux

ugbc.pc128op -O k7 -o procedures_param_01.k7 procedures_param_01.bas

Windows

ugbc.pc128op.exe -O k7 -o procedures_param_01.k7 procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

SEGA SC-3000

In order to compile the example, type this command on the command line:

Linux

ugbc.sc3000 -O rom -o procedures_param_01.rom procedures_param_01.bas

Windows

ugbc.sc3000.exe -O rom -o procedures_param_01.rom procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

SEGA SG-1000

In order to compile the example, type this command on the command line:

Linux

ugbc.sg1000 -O rom -o procedures_param_01.rom procedures_param_01.bas

Windows

ugbc.sg1000.exe -O rom -o procedures_param_01.rom procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

TRS-80 Color Computer, TRS-80 Color Computer 2

In order to compile the example, type this command on the command line:

Linux

ugbc.coco -O bin -o procedures_param_01.bin procedures_param_01.bas

Windows

ugbc.coco.exe -O bin -o procedures_param_01.bin procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

TRS-80 Color Computer 3

In order to compile the example, type this command on the command line:

Linux

ugbc.coco3 -O bin -o procedures_param_01.bin procedures_param_01.bas

Windows

ugbc.coco3.exe -O bin -o procedures_param_01.bin procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Thomson TO8

In order to compile the example, type this command on the command line:

Linux

ugbc.to8 -O k7 -o procedures_param_01.k7 procedures_param_01.bas

Windows

ugbc.to8.exe -O k7 -o procedures_param_01.k7 procedures_param_01.bas

For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to download and compile this example with just one click.

Any problem?

If you have found a problem trying to run this example, if you think there is a bug or, more simply, you would like it to be improved, open an issue for this example on GitHub.
Thank you!

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