素数回文文回数素

解题思路:

注意事项:

参考代码:

#include <stdio.h>

int fun(int n)

{

        int i;

        for(i=2;i*i<=n;i++)

                if(n%i==0)return 0;

        return 1;

}

int happy(int n)

{

        int nn=n,num=0,sum=0,i;

        while(nn>0)

        {

                nn=nn/10;

                num++;

        }

        for(i=0;i<num/2;i++)

        {

                sum=sum*10+n%10;

                n=n/10;

        }

        if((num%2!=0&&sum==n/10)||(num%2==0&&sum==n))return 1;

        return 0;

}

int main()

{

        int a,b,i;

        scanf("%d%d",&a,&b);

        for(i=a;i<=b;i++)

                if(fun(i)&&happy(i))printf("%d\n",i);

        return 0;

}