Twisted Prime

The program must accept an integer N as the input. The program must print YES if N is a twisted prime number. Else the program must print NO as the output. A number is said to be twisted prime if it is a prime number and reverse of the number is also a prime number.

Boundary Condition(s):
1 <= N <= 10^16

Input Format:
The first line contains the value of N.

Output Format:
The first line contains either YES or NO.

Example Input/Output 1:
Input:
97

Output:
YES

Explanation:
97 is a prime number.
The reverse of 97 is 79. So 79 is also a prime number.
Hence the output is YES

Example Input/Output 2:
Input:
34

Output:
NO

Solution :-

#include<stdio.h>

#include <stdlib.h>

int isprime(int  n)

{

    for(int i=2;i<=n/2;i++)

    {

        if(n%i==0)

        return 0;

    }

    

    return 1;

}

int main()

{

    int n;

    int x=0,y=0;

    int f1=0,f2=0;

    scanf("%d",&n);

    x=n;

    

    while(x!=0)

    {

        y=y*10+x%10;

        x=x/10;

    }

    

    

    f1=isprime(n);

    f2=isprime(y);

    

    

    if(f1==1 && f2==1)

    printf("YES");

    else

    printf("NO");

    

   

    

}