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Updated sieve example source

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Bobbi Webber-Manners 2018-05-03 21:15:14 -04:00 committed by GitHub
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@ -1097,47 +1097,49 @@ See `eightballvm.h` for technical details.
## Prime Number Sieve
Here is the well-known Sieve of Eratosthenes algorithm for finding prime numbers, written in EightBall:
```
' Sieve of Eratosthenes
' Sieve of Eratosthenes
' Globals
byte nr = 10
word n = nr * nr
byte A[100] = 1 ' Has to be a literal
pr.msg "Sieve of Eratosthenes ..."; pr.nl
call doall()
end
sub doall()
call sieve()
call printresults()
endsub
sub sieve()
word i = 0; word j = 0
for i = 2 : (nr - 1)
if A[i]
j = i * i
while (j < n)
A[j] = 0
j = j + i
endwhile
endif
endfor
endsub
sub printresults()
word i = 0
for i = 2 : (n - 1)
if A[i]
if i > 2
pr.msg ", "
endif
pr.dec i
endif
endfor
pr.msg "."
endsub
byte A[20*20] = 1
call doall(20, A)
end
sub doall(word nr, byte array[])
word n = nr * nr
pr.msg "Sieve of Eratosthenes ..."
pr.msg "nr is "; pr.dec nr; pr.nl
call sieve(n, nr, array)
call printresults(n, array)
return 0
endsub
sub sieve(word n, word nr, byte AA[])
pr.msg "Sieve"
word i = 0; word j = 0
for i = 2 : (nr - 1)
if AA[i]
j = i * i
while (j < n)
AA[j] = 0
j = j + i
endwhile
endif
endfor
return 0
endsub
sub printresults(word n, byte AA[])
word i = 0
for i = 2 : (n - 1)
if AA[i]
if i > 2
pr.msg ", "
endif
pr.dec i
endif
endfor
pr.msg "."
pr.nl
return 0
endsub
```