【正确答案】void countleaf(bitreptr t,int * count)
   {
   if(t!=NULL)
   {
   if((t-＞lchild==NULL) && (t-＞rchild==NULL))
   *count++;
   countleaf(t-＞lchild,count);
   countleaf(t-＞rchild,count);
   }
   }