{{htmlmetatags>metatag-robots=() metatag-title=(USER-DEFINED PROCEDURES RETURN VALUE (USING RETURN) (2) | ugBASIC User Manual) metatag-keywords=(ugBASIC,Commodore 64,Commodore PLUS/4,ZX Spectrum) metatag-description=(An isomorphic language for retrocomputers) metatag-media-og:image=(:ugbasic:logo-ugbasic-fb.png) metatag-og:title=(USER-DEFINED PROCEDURES RETURN VALUE (USING RETURN) (2) | ugBASIC User Manual) metatag-og:description=(An isomorphic language for retrocomputers) }} ====== ugBASIC User Manual ====== ===== USER-DEFINED PROCEDURES RETURN VALUE (USING RETURN) (2) ===== ==== PURPOSE ==== 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. ==== SOURCE CODE ==== CLS PROCEDURE joinString[a$,b$,c$] PRINT "joinString called with:" PRINT " a$ = ";a$ PRINT " b$ = ";b$ PRINT " c$ = ";c$ RETURN a$+b$+c$ END PROC result = joinString["ONE","TWO","THREE"] PRINT "joinString[ONE,TWO,THREE] = ";result ==== SOURCE FILE ==== * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/procedures_param_03.bas|procedures_param_03.bas]]'' ==== HOW TO COMPILE AND RUN ==== The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using **[[https://spotlessmind1975.itch.io/ugbasic-ide|UGBASIC-IDE]]**, which allows you to compile the example with just one click.=== ATARI 400/800 family === In order to compile and run the example, you need to have the Altirra emulator, and in particular that the ''altirra'' executable is accessible. Then, type this command on the command line: # Linux ugbc.atari procedures_param_03.bas -o example.xex altirra example.xex # Windows ugbc.atari.exe procedures_param_03.bas -o example.xex altirra example.xex === ATARI 600XL/800XL/1200XL/XG(SE) family === In order to compile and run the example, you need to have the Altirra emulator, and in particular that the ''altirra'' executable is accessible. Then, type this command on the command line: # Linux ugbc.atarixl procedures_param_03.bas -o example.xex altirra example.xex # Windows ugbc.atarixl.exe procedures_param_03.bas -o example.xex altirra example.xex === Commodore 64 === In order to compile and run the example, you need to have the VICE emulator, and in particular that the ''x64sc'' executable is accessible. Then, type this command on the command line: # Linux ugbc.c64 procedures_param_03.bas -o example.prg x64sc example.prg # Windows ugbc.c64.exe procedures_param_03.bas -o example.prg x64sc example.prg === Commodore 64+REU === In order to compile and run the example, you need to have the VICE emulator, and in particular that the ''x64sc'' executable is accessible. Then, type this command on the command line: # Linux ugbc.c64reu procedures_param_03.bas -o example.prg x64sc -reu example.prg # Windows ugbc.c64reu.exe procedures_param_03.bas -o example.prg x64sc -reu example.prg === Commodore PLUS/4 === == Using YAPE == In order to run the example, you need to have the YAPE emulator. In particular that the ''yape'' executable is accessible. Then, type this command on the command line: # Linux ugbc.plus4 procedures_param_03.bas -o example.prg yape example.prg # Windows ugbc.plus4.exe procedures_param_03.bas -o example.prg yape example.prg == Using VICE == In order to run the example, you need to have the VICE emulator. In particular that the ''xplus4'' executable is accessible. Then, type this command on the command line: # Linux ugbc.plus4 procedures_param_03.bas -o example.prg xplus4 example.prg # Windows ugbc.plus4.exe procedures_param_03.bas -o example.prg xplus4 example.prg === Dragon 32 === In order to compile and run the example, you need to have the XROAR emulator, and in particular that the ''xroar'' executable is accessible. Then, type this command on the command line: # Linux ugbc.d32 procedures_param_03.bas -o example.bin xroar -rompath (your rom path) example.bin # Windows ugbc.d32.exe procedures_param_03.bas -o example.bin xroar.exe -rompath (your rom path) example.bin === Dragon 64 === In order to compile and run the example, you need to have the XROAR emulator, and in particular that the ''xroar'' executable is accessible. Then, type this command on the command line: # Linux ugbc.d64 procedures_param_03.bas -o example.bin xroar -rompath (your rom path) example.bin # Windows ugbc.d64.exe procedures_param_03.bas -o example.bin xroar.exe -rompath (your rom path) example.bin === PC128 Olivetti Prodest === In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the ''dcmoto'' executable is accessible. Then, type this command on the command line and on the emulator: # Linux ugbc.pc128op procedures_param_03.bas -o example.k7 dcmoto (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC # Windows ugbc.pc128op.exe procedures_param_03.bas -o example.k7 dcmoto (choose example.k7) (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC === Thomson MO5 === In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the ''dcmoto'' executable is accessible. Then, type this command on the command line and on the emulator: # Linux ugbc.pc128op procedures_param_03.bas -o example.k7 dcmoto (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC # Windows ugbc.pc128op.exe procedures_param_03.bas -o example.k7 dcmoto (choose example.k7) (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC === Commodore VIC-20 === In order to compile and run the example, you need to have the VICE emulator, and in particular that the ''xvic'' executable is accessible. Then, type this command on the command line: # Linux ugbc.vic20 procedures_param_03.bas -o example.prg xvic --memory 24k example.prg # Windows ugbc.vic20.exe procedures_param_03.bas -o example.prg xvic --memory 24k example.prg === ZX Spectrum === In order to compile and run the example, you need to have the Speccy emulator, and in particular that the ''speccy'' executable is accessible. Then, type this command on the command line: # Linux ugbc.zx procedures_param_03.bas -o example.tap Speccy example.tap # Windows ugbc.zx.exe procedures_param_03.bas -o example.tap Speccy example.tap === MSX === In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible. Then, type this command on the command line: == openMSX == # Linux ugbc.msx1 procedures_param_03.bas -o example.rom openmsx -cart example.rom # Windows ugbc.msx1.exe procedures_param_03.bas -o example.rom openmsx -cart example.rom == blueMSX == # Linux ugbc.msx1 procedures_param_03.bas -o example.rom bluemsx example.rom # Windows ugbc.msx1.exe procedures_param_03.bas -o example.rom bluemsx example.rom === ColecoVision === In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible. Then, type this command on the command line: == openMSX == # Linux ugbc.coleco procedures_param_03.bas -o example.rom openmsx -machine \"COL - ColecoVision\" -cart example.rom # Windows ugbc.coleco.exe procedures_param_03.bas -o example.rom bluemsx -machine \"COL - ColecoVision\" example.rom == blueMSX == # Linux ugbc.coleco procedures_param_03.bas -o example.rom bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom # Windows ugbc.coleco.exe procedures_param_03.bas -o example.rom bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom === SEGA SC-3000 === In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible. Then, type this command on the command line: # Linux ugbc.sc3000 procedures_param_03.bas -o example.rom bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom # Windows ugbc.sc3000.exe procedures_param_03.bas -o example.rom bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom === SEGA SG-1000 === In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible. Then, type this command on the command line: # Linux ugbc.sg1000 procedures_param_03.bas -o example.rom bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom # Windows ugbc.sg1000.exe procedures_param_03.bas -o example.rom bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom ==== 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, [[https://github.com/spotlessmind1975/ugbasic/issues/new?title=IMPROVE USER-DEFINED PROCEDURES RETURN VALUE (USING RETURN) (2)|open an issue]] for this example on GitHub. Thank you!===== POWERED BY ===== [[:ugbasic:user:examples|{{ :ugbasic:user:logo-ugbasic.png?nolink&600 |}}]]