OTHER CONTRIBUTIONS: PRIME NUMBERS (4)

This small example will extract the prime numbers between 2 and 400. It has been taken and adapted by an exampled published on RetroProgramming Italia's Facebook group.

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SOURCE CODE ()

4 CLS
5 REM inizializzo limite massimo e array di flag 
6 REM nums(x) = 0 -> x dentro
7 REM nums(x) = 1 -> x fuori
10 CONST maxn=400:DIM nums(maxn)
12 REM inizializzo timer e contatore di numeri primi
15 TI=0:np%=0
17 REM esamino tutti i numeri da 2 a maxn
20 FOR i=2 TO maxn
25 REM se il numero i è fuori dal crivello, passo al successivo
30 IF nums(i) <> 0 THEN : GOTO 90 : ENDIF
35 REM altrimenti i è primo. incremento contatore primi
36 REM stampo il primo i e mi preparo a generare i multipli
40 np%=np%+1:PRINT i,:k%=1
45 REM calcolo il multiplo come i*k (k=1,2,..)
46 REM finchè il multiplo è <= maxn
47 REM poi passo ad esaminare il prossimo i
50 multiplo=i*k%
60 IF multiplo>maxn THEN : GOTO 90 : ENDIF
70 REM metto il multiplo fuori dal crivello 
80 nums(multiplo)=1
82 REM calcolo il prossimo multiplo da escludere 
85 k%=k%+1:GOTO 50
90 NEXT
95 REM stampo il contatore dei numeri primi e il tempo trascorso 
100 REM PRINT:PRINT "contaprimi: ";np%
110 REM PRINT "ti ";TI
115 ct=(TI/60)
120 IF ct>60 THEN : ct=ct-60 : m%=m%+1 : GOTO 120 : ENDIF
130 PRINT:PRINT "time: ";m%;" min ";ct;" s"
140 PRINT CHR$(126);"(";c%;") =";np%

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 contrib_primes4.dsk contrib_primes4.bas

Windows

ugbc.cpc.exe -O dsk -o contrib_primes4.dsk contrib_primes4.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 contrib_primes4.xex contrib_primes4.bas

Windows

ugbc.atarixl.exe -O xex -o contrib_primes4.xex contrib_primes4.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 contrib_primes4.xex contrib_primes4.bas

Windows

ugbc.atari.exe -O xex -o contrib_primes4.xex contrib_primes4.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 contrib_primes4.prg contrib_primes4.bas

Windows

ugbc.c128.exe -O prg -o contrib_primes4.prg contrib_primes4.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 contrib_primes4.prg contrib_primes4.bas

Windows

ugbc.c64.exe -O prg -o contrib_primes4.prg contrib_primes4.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 contrib_primes4.bin contrib_primes4.bas

Windows

ugbc.d32.exe -O bin -o contrib_primes4.bin contrib_primes4.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 contrib_primes4.bin contrib_primes4.bas

Windows

ugbc.d64.exe -O bin -o contrib_primes4.bin contrib_primes4.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 contrib_primes4.k7 contrib_primes4.bas

Windows

ugbc.pc128op.exe -O k7 -o contrib_primes4.k7 contrib_primes4.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 contrib_primes4.bin contrib_primes4.bas

Windows

ugbc.coco.exe -O bin -o contrib_primes4.bin contrib_primes4.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 contrib_primes4.k7 contrib_primes4.bas

Windows

ugbc.to8.exe -O k7 -o contrib_primes4.k7 contrib_primes4.bas

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

VIC-20

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

Linux

ugbc.vic20 -O prg -o contrib_primes4.prg contrib_primes4.bas

Windows

ugbc.vic20.exe -O prg -o contrib_primes4.prg contrib_primes4.bas

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

ZX Spectrum +2, ZX Spectrum 128K, ZX Spectrum 48K

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

Linux

ugbc.zx -O tap -o contrib_primes4.tap contrib_primes4.bas

Windows

ugbc.zx.exe -O tap -o contrib_primes4.tap contrib_primes4.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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