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uxn/projects/examples/exercises/primes.tal

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( Primes:
An integer greater than one is called a prime number
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if its only positive divisors are one and itself. )
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|0100 ( -> ) @reset
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#0000 INC2k
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&loop
DUP2 ,is-prime JSR #00 EQU ,&skip JCN
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( print ) DUP2 ,print/short JSR
( space ) #2018 DEO
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&skip
INC2 NEQ2k ,&loop JCN
POP2 POP2
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( halt ) #010f DEO
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BRK
@is-prime ( number* -- flag )
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DUP2 ,&t STR2
( range ) #01 SFT2 #0002 LTH2k ,&fail JCN
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&loop
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[ LIT2 &t $2 ] OVR2
( mod2 ) DIV2k MUL2 SUB2
ORA #00 EQU ,&fail JCN
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INC2 GTH2k ,&loop JCN
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POP2 POP2 #01
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JMP2r
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&fail POP2 POP2 #00 JMP2r
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@print ( short* -- )
&short ( short* -- ) SWP ,&byte JSR
&byte ( byte -- ) DUP #04 SFT ,&char JSR
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&char ( char -- ) #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO
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JMP2r