<ÌäÂê> £²¡Ý£µ£°¤Þ¤Ç¤ÎÁÇ¿ô¤òµá¤á¤è
<¼Â¹Ô·ë²Ì>¡¡
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47
<¥Ò¥ó¥È>
²òÅúÎã #include <stdio.h> #define N 50 // ¥×¥í¥°¥é¥àÃæ¤ÎN¤È¤¤¤¦Ê¸»ú¤ò¡¢50¤Ë¤ª¤¤«¤¨ int main (void) { int p[N+1]; int i,j; /* ¡ p[2] - p[N]¤ò£±¤Ë½é´ü²½ */ for(i = 2; i <= N; i++) p[i]=1; /* ¢c ¼«Ê¬¤è¤ê¸å¤í¤Î¼«Ê¬¤ÎÇÜ¿ô¤òÁÀ¤Ã¤ÆÀѶËŪ¤Ë0¤Ë¤·¤Æ¤¤¤¯ */ for(i = 2 ; i <= N; i++) if(p[i] == 1) for(j = 2; i*j < N+1 ; j++)¡¡/* j=1¤Î¤È¤¤ÏÁÇ¿ô¼«¿È */ p[i*j] = 0; /* £ Ãͤ¬1¤Î¤â¤Î¤Ï¡¢ÁÇ¿ô */ for(i = 2; i <= N; i++) if(p[i]==1) printf("%3d", i); printf("\n"); // N¤Î¿ô¤¬Â礤¤¤È¤¤Ï¡¢ifʸÆâ¤Ç²þ¹Ô¤·¤¿¤Û¤¦¤¬¤è¤¤ return 0; }