队列的入队、出队操作实现_c++普通队列能同时进出吗

C++代码如下：

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <conio.h>
using namespace std;
 
typedef struct student
{
	int data;
	struct student *next;
}node;
 
typedef struct linkqueue   //队列有两个节点，头节点和尾节点
{
	node *first,*rear;
}queue;
 
queue *insert(queue *HQ,int x)   //入队
{
	node *s;
	s=(node *)malloc(sizeof(node));
	s->data=x;
	s->next=NULL;
	if (HQ->rear==NULL)
	{
		HQ->first=s;
		HQ->rear=s;
	}
	else
	{
		HQ->rear->next=s;
		HQ->rear=s;
	}
	return HQ;
}
 
queue *del(queue *HQ)    //出队
{
	node *p;
	int x;
	if (HQ->first==NULL)
	{
		cout<<"溢出";
	}
	else
	{
		x=HQ->first->data;
		p=HQ->first;
		if (HQ->first==HQ->rear)
		{
			HQ->first=NULL;
			HQ->rear=NULL;
		}
		else
		{
			HQ->first=HQ->first->next;
			free(p);
		}
		return HQ;
	}
}