C++嵌套多层循环

#include <iostream>

using namespace std;

int main () {
   int i, j;

   for(i = 2; i<100; i++) {
      for(j = 2; j <= (i/j); j++)
         if(!(i%j)) break;    // if factor found, not prime
         if(j > (i/j)) cout << i << " is prime/n";
   }

   return 0;
}