#include <iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;

int smallFactor(int x) {
   int answer = 2;
   while (x % answer != 0) answer++;
   return answer;
}

int main() {
   int score = 0;
   srand(time(NULL));

   cout << "Are these numbers prime? Y or N: " << endl;
   for (int c = 1; c <= 10; c++) {
      int qn = 2;
      while (smallFactor(qn) < 7) {   // reject easy questions
         qn = rand() % 400 + 2;
      }
      cout << qn << "? ";
      string ans;
      cin >> ans;
      if (ans == "Y" && smallFactor(qn) == qn) score ++;
      if (ans == "N" && smallFactor(qn) < qn) score ++;
   }
   cout << endl << "You scored " << score << " out of 10 " << endl;
   return 0;
}