in Miller Rabin random value a is lesser than n...
i think u r missing it, isn't it ??
On Wed, Jan 18, 2012 at 3:28 PM, Sourabh Singh <singhsourab...@gmail.com>wrote:
> @ALL hi everyone m trying to make prime checker based on miller-rabin
> test . can some1 point out . wat's wrong with the code. thank's alot
> in advance...
>
> //prime checker based on miller-rabin test
> #include<iostream>
> #include<conio.h>
> #include<math.h>
> int is_prime(int n)
> {
> if(n==2 | n==3)
> return 1;
> if(((n-1)%6!=0 & (n+1)%6!=0) || n<2)
> return 0;
> int s,d;
> for(s=0;1<<s<n;++s); s--;d=(n%(1<<s));
>
> int primes[6]={2,3,7,31,61,73},i,a,flag;
> uint64_t x;
> for(i=0;i<6;i++)
> { flag=0;
>
> a=primes[i];
> x=uint64_t(pow(a,d))%n;
> if(x==1 | x==n-1)
> continue;
> for(int r=1;r<s;r++)
> { x=(x*x)%n;
> printf("x is %llu\n",x);
> if(x==1)
> return 0;
> else
> flag=1;
> }
> if(flag)
> continue;
> return 0;
> }
> return 1;
> }
> main()
> {
> for(int k=1;k<100;k++)
> {
> printf("%d is %d\n",k,is_prime(k));
> }
> getch();
> }
>
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>
--
Sunny Aggrawal
B.Tech. V year,CSI
Indian Institute Of Technology,Roorkee
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