D语言嵌套循环

import std.stdio;

int main () {
   /* local variable definition */
   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)) writefln("%d is prime", i);
   }

   return 0;
}