D语言break语句

import std.stdio;

int main () {
   /* local variable definition */
   int a = 10;

   /* while loop execution */
   while( a < 20 ) {
      writefln("value of a: %d", a);
      a++;

      if( a > 15) {
         /* terminate the loop using break statement */
         break;
      }
   }

   return 0;
}