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Execute SNUSP: Difference between revisions
j version
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See [[RCSNUSP/Haskell]].
=={{header|J}}==
Perhaps I'll revisit and write a tacit version of the program.
<lang J>
Note 'snusp'
Without $ character the program counter starts at top left (0 0) moving to the right (0 1)
> increment the pointer (to point to the next cell to the right).
< decrement the pointer (to point to the next cell to the left).
+ increment (increase by one) the cell at the pointer.
- decrement (decrease by one) the cell at the pointer.
. output the value of the cell at the pointer as a character.
, accept one character of input, storing its value in the cell at the pointer.
\/ mirrors
? skip if memory pointer is 0
! skip
)
smoutput 'Toroidal programs run forever. Use ^C to interrupt.'
main =: 3 : 0 NB. use: main 'program.snusp'
PROGRAM =: [;._2 LF ,~ 1!:1 boxopen y
SHAPE =: $PROGRAM
PC =: SHAPE#:(,PROGRAM) i.'@'
PCSTEP =: 0 1
CELL =: 0
CELLS =: ,0
while. 1 do. NB. for_i. i.400 do.
INSTRUCTION =: (<PC) { PROGRAM
STEP =: PCSTEP
select. INSTRUCTION
case. '<' do.
CELL =: <: CELL
if. CELL < 0 do.
CELL =: 0
CELLS =: 0 , CELLS
end.
case. '>' do.
CELL =: >: CELL
if. CELL >: # CELLS do.
CELLS =: CELLS , 0
end.
case. ;/'-+' do. CELLS =: CELL ((<:'- +'i.INSTRUCTION)+{)`[`]} CELLS
case. '.' do. 1!:2&4 (CELL{CELLS){a.
case. ',' do. CELLS =: (1!:1<1) CELL } CELLS
fcase. '/' do. STEP =: - STEP
case. '\' do. STEP =: PCSTEP =: |. STEP
case. '?' do. STEP =: +:^:(0 = CELL{CELLS) STEP
case. '!' do. STEP =: +: STEP
end.
PC =: (| (PC + STEP + ])) SHAPE NB. toroidal
NB. smoutput PC;CELL;CELLS NB. debug
end.
)
</lang>
Store <lang SNUSP>\ display JJ and linefeed, then loop forever
\ +++++++++++++++++++++++++++++++++++++\
! /+++++++++++++++++++++++++++++++++++++/
/ \..<+++++\
\ . +++++/
</lang> as J.snusp
<pre>
load'snusp.ijs' NB. the j code above
Toroidal programs run forever. Use ^C to interrupt.
main'J.snusp'
JJ
^C
|attention interrupt: main
</pre>
=={{header|Java}}==
See [[RCSNUSP/Java]]
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