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Diffstat (limited to 'crawl-ref/source/util/lua/test/sieve.lua')
| -rw-r--r-- | crawl-ref/source/util/lua/test/sieve.lua | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/crawl-ref/source/util/lua/test/sieve.lua b/crawl-ref/source/util/lua/test/sieve.lua deleted file mode 100644 index 0871bb2125..0000000000 --- a/crawl-ref/source/util/lua/test/sieve.lua +++ /dev/null @@ -1,29 +0,0 @@ --- the sieve of of Eratosthenes programmed with coroutines --- typical usage: lua -e N=1000 sieve.lua | column - --- generate all the numbers from 2 to n -function gen (n) - return coroutine.wrap(function () - for i=2,n do coroutine.yield(i) end - end) -end - --- filter the numbers generated by `g', removing multiples of `p' -function filter (p, g) - return coroutine.wrap(function () - while 1 do - local n = g() - if n == nil then return end - if math.mod(n, p) ~= 0 then coroutine.yield(n) end - end - end) -end - -N=N or 1000 -- from command line -x = gen(N) -- generate primes up to N -while 1 do - local n = x() -- pick a number until done - if n == nil then break end - print(n) -- must be a prime number - x = filter(n, x) -- now remove its multiples -end |