数据结构队列入队操作报错

Question

using namespace std;
typedef struct linklist
{
    int data;
    struct linklist *pnext;
}list;
typedef struct
{
    list *front;
    list *rear;
}queue;
bool init(queue *L)
{
    L=new queue;
    L->front=new list;
    L->rear=L->front;
    L->front->pnext=NULL;
    return true;
}
bool insert(queue *L,int x)
{
    list *p;
    p=new list;
    p->data=x;
    p->pnext=NULL;
    L->rear->pnext=p;
    L->rear=p;
    return true;
}
int main()
{
    queue *L;
    int x=0;
    init(L);
    cin>>x;
    insert(L,x);
}

如题，
![图片说明](https://img-ask.csdn.net/upload/202004/06/1586165437_59905.png)

insert里L->rear->pnext=p;显示program receiced signal SIGSEGV,Segmentation fault  求解

Answer 1

bool init(queue *L)
一个指针是不能回传的，得用**L