?

#include?"math.h"
#include?"stdio.h"
/**//*?×?′ó??êyoí×?D???êy￡????ìkissrat′ó??2?μ??aóD′??üó??a·¨*/
void?main(){
????long?m,m1,i,k;

????for(m=100000002;m<=100001000;m+=6){
????????m1=m-1;
????????k=sqrt(m1);
????????for?(i=3;i<=k;i+=2)if(m1%i==0)?break;
????????if(i>k){
????????????printf("%ld?is?a?prime\n",m1);
????????????break;
????????}
????????m1=m+1;
????????k=sqrt(m1);
????????for?(i=3;i<=k;i+=2)if(m1%i==0)?break;
????????if(i>k){
????????????printf("%ld?is?a?prime\n",m1);
????????????break;
????????}
????}

????for(m=999999998;m>=999999000;m-=6){
????????m1=m+1;
????????k=sqrt(m1);
????????for?(i=3;i<=k;i+=2)if(m1%i==0)?break;
????????if(i>k){
????????????printf("%ld?is?a?prime\n",m1);
????????????break;
????????}
????????m1=m-1;
????????k=sqrt(m1);
????????for?(i=3;i<=k;i+=2)if(m1%i==0)?break;
????????if(i>k){
????????????printf("%ld?is?a?prime\n",m1);
????????????break;
????????}
????}
}

轉載于:https://www.cnblogs.com/jacktu/archive/2008/03/17/1109894.html

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