mirror of
https://github.com/irmen/prog8.git
synced 2024-06-14 00:29:34 +00:00
38 lines
834 B
Lua
38 lines
834 B
Lua
%import textio
|
|
|
|
; The "Byte Sieve" test. https://en.wikipedia.org/wiki/Byte_Sieve
|
|
|
|
main {
|
|
sub start() {
|
|
|
|
uword count
|
|
uword i
|
|
uword prime
|
|
uword k
|
|
const uword SIZEPL = 8191
|
|
uword @zp flags_ptr = memory("flags", SIZEPL, $100)
|
|
|
|
txt.print("calculating...\n")
|
|
|
|
sys.memset(flags_ptr, SIZEPL, 1)
|
|
count = 0
|
|
for i in 0 to SIZEPL-1 {
|
|
if flags_ptr[i]!=0 {
|
|
prime = i + i + 3
|
|
k = i + prime
|
|
while k <= SIZEPL-1 {
|
|
flags_ptr[k] = 0 ; false
|
|
k += prime
|
|
}
|
|
txt.print_uw(prime)
|
|
txt.nl()
|
|
count++
|
|
}
|
|
}
|
|
|
|
txt.nl()
|
|
txt.print_uw(count)
|
|
txt.print(" primes\n")
|
|
}
|
|
}
|