struct node

{ ElemType data;

struct node *next;

};

struct node *front，*rear;

void InQueue(ElemType x)

{

struct node *p;

p= (struct node*) malloc __(1)__;

p->data=x;

p->next=NULL;

__(2)__;

rear= __(3)__;

}选项3(matching)
.p