FLOW CONTROL: EXITING FROM NESTED LOOP

This small example will use the DO...LOOP keywords to implement an endless loop, and the command EXIT n to break n loops. The outer loop will change, at each half of second, the border's color from black to yellow. The inner loop will change the color of border to red and green. Instead of continuing with the inner loop, this one (and the outer) will be exited by using the EXIT 2 command. The border color is changed using the COLOR BORDER instruction, using the predefined constants YELLOW, BLACK, RED, GREEN. To wait for a specific amount of time the WAIT command will be used, with the MS (milliseconds) unit of time.

source compile sandbox issues? back to examples

SOURCE CODE ()

   CLS

   DO
      COLOR BORDER YELLOW
      HOME: PRINT "YELLOW"
      WAIT 500 MS
      COLOR BORDER BLACK
      HOME: PRINT "BLACK "
      WAIT 500 MS
      DO
         COLOR BORDER RED
         HOME: PRINT "RED   "
         WAIT 1000 MS
         COLOR BORDER GREEN
         HOME: PRINT "GREEN "
         WAIT 1000 MS
         DO
            COLOR BORDER RED
            HOME: PRINT "RED   "
            WAIT 1000 MS
            EXIT 2 : REM EXIT 2 = skip 1 more loop, because "EXIT" == "EXIT 1"!
            REM The border will never be green,
            REM and the secondo loop will be skiped
            COLOR BORDER GREEN
            HOME: PRINT "GREEN "
            WAIT 1000 MS
         LOOP
      LOOP
   LOOP

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 control_loops_03.dsk control_loops_03.bas

Windows

ugbc.cpc.exe -O dsk -o control_loops_03.dsk control_loops_03.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 control_loops_03.xex control_loops_03.bas

Windows

ugbc.atarixl.exe -O xex -o control_loops_03.xex control_loops_03.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 control_loops_03.xex control_loops_03.bas

Windows

ugbc.atari.exe -O xex -o control_loops_03.xex control_loops_03.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 control_loops_03.rom control_loops_03.bas

Windows

ugbc.coleco.exe -O rom -o control_loops_03.rom control_loops_03.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 control_loops_03.prg control_loops_03.bas

Windows

ugbc.c128.exe -O prg -o control_loops_03.prg control_loops_03.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 control_loops_03.prg control_loops_03.bas

Windows

ugbc.c64.exe -O prg -o control_loops_03.prg control_loops_03.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 control_loops_03.bin control_loops_03.bas

Windows

ugbc.d32.exe -O bin -o control_loops_03.bin control_loops_03.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 control_loops_03.bin control_loops_03.bas

Windows

ugbc.d64.exe -O bin -o control_loops_03.bin control_loops_03.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 control_loops_03.rom control_loops_03.bas

Windows

ugbc.sc3000.exe -O rom -o control_loops_03.rom control_loops_03.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 control_loops_03.rom control_loops_03.bas

Windows

ugbc.sg1000.exe -O rom -o control_loops_03.rom control_loops_03.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 control_loops_03.bin control_loops_03.bas

Windows

ugbc.coco.exe -O bin -o control_loops_03.bin control_loops_03.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 control_loops_03.bin control_loops_03.bas

Windows

ugbc.coco3.exe -O bin -o control_loops_03.bin control_loops_03.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!

open an issue BACK TO EXAMPLES