📄 eratosthenes篩選求質數.mht
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<H3><A=20
href=3D"http://caterpillar.onlyfun.net/Gossip/index.html">http://caterpil=
lar.onlyfun.net/Gossip/index.html</A></H3>
<H1><A=20
href=3D"http://www.java3z.com/cwbwebhome/article/article3/AlgorithmGossip=
/AlgorithmGossip.htm">Algorithm=20
Gossip: Eratosthenes=BFz=BF=EF=A8D=BD=E8=BC=C6</A></H1>
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Eratosthenes=A8D=BD=E8=BC=C6=A4=E8=AAk=A1C<BR>
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>
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k=A1]Eratosthenes=20
Sieve=20
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<BR>
<H2>=B9=EA=A7@</H2>
<UL>
<LI>C </LI></UL><PRE>#include <stdio.h> <BR>#include =
<stdlib.h> <BR><BR>#define N 1000 <BR><BR>int main(void) { <BR> =
int i, j; <BR> int prime[N+1]; <BR><BR> for(i =3D 2; i <=3D N; =
i++) <BR> prime[i] =3D 1; <BR><BR> for(i =3D 2; i*i <=3D N; =
i++) { // =B3o=C3=E4=A5i=A5H=A7=EF=B6i <BR> if(prime[i] =3D=3D 1) =
{ <BR> for(j =3D 2*i; j <=3D N; j++) { <BR> =
if(j % i =3D=3D 0) <BR> prime[j] =3D 0; <BR> =
} <BR> } <BR> } <BR><BR> for(i =3D 2; i < N; i++) { =
<BR> if(prime[i] =3D=3D 1) { <BR> printf("%4d ", i); =
<BR> if(i % 16 =3D=3D 0) <BR> printf("\n"); =
<BR> } <BR> } <BR><BR> printf("\n"); <BR><BR> return 0; =
<BR>} <BR></PRE><BR>
<UL>
<LI>Java </LI></UL><PRE>import java.util.*;<BR><BR>public class Prime =
{ <BR> public static int[] findPrimes(final int max) { <BR> =
int[] prime =3D new int[max+1]; <BR> ArrayList list =3D new =
ArrayList();<BR><BR> for(int i =3D 2; i <=3D max; i++) <BR> =
prime[i] =3D 1; <BR><BR> for(int i =3D 2; i*i <=3D =
max; i++) { // =B3o=C3=E4=A5i=A5H=A7=EF=B6i <BR> if(prime[i] =
=3D=3D 1) { <BR> for(int j =3D 2*i; j <=3D max; j++) { =
<BR> if(j % i =3D=3D 0) <BR> =
prime[j] =3D 0; <BR> } <BR> } <BR> } =
<BR><BR> for(int i =3D 2; i < max; i++) { <BR> =
if(prime[i] =3D=3D 1) { <BR> list.add(new Integer(i)); =
<BR> } <BR> }<BR> <BR> int[] p =3D new =
int[list.size()];<BR> Object[] objs =3D list.toArray(); <BR> =
for(int i =3D 0; i < p.length; i++) {<BR> p[i] =3D =
((Integer) objs[i]).intValue();<BR> }<BR> <BR> =
return p;<BR> }<BR> <BR> public static void main(String[] args) =
{<BR> int[] prime =3D Prime.findPrimes(1000);<BR> <BR> =
for(int i =3D 0; i < prime.length; i++) {<BR> =
System.out.print(prime[i] + " ");<BR> }<BR> <BR> =
System.out.println();<BR> }<BR>}</PRE><BR><BR></BODY></HTML>
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