/*
不帶頭結點的鏈式隊列進出隊操作
*/
#include <stdio.h>
#include <stdlib.h>
#define ElementType int
typedef struct QNode *Queue;
typedef struct Node{
ElementType Data;
struct Node *Next;
};
typedef struct QNode{
struct Node *front;
struct Node *rear;
};
void InintQueue(Queue &PtrQ){//雖然是指針,但是沒賦值之前也不能亂指
PtrQ = (Queue)malloc(sizeof(struct QNode));
PtrQ->front=PtrQ->rear=NULL;
}
bool EnQueue(Queue PtrQ, ElementType X){
struct Node *RearCell = PtrQ->rear;
struct Node *Tmp = (struct Node *)malloc(sizeof(struct Node));
Tmp->Data = X;
Tmp->Next=NULL;
if(PtrQ->front==NULL)//隊列為空,進第一個元素
PtrQ->rear=PtrQ->front=Tmp;
else{
PtrQ->rear->Next = Tmp;
PtrQ->rear = Tmp;
}
return true;
}
ElementType DeleteQ(Queue PtrQ){
struct Node *FrontCell;
ElementType FrontElem;
if(PtrQ->front==NULL){
printf("隊列為空\n");
return 1;
}
FrontCell = PtrQ->front;
if(PtrQ->front==PtrQ->rear)//若隊列中只有一個元素
PtrQ->front=PtrQ->rear=NULL;//刪除后置空
else
PtrQ->front = PtrQ->front->Next;
FrontElem = FrontCell->Data;
free(FrontCell);
return FrontElem;
}
Is_EmptyQ(Queue PtrQ){
return PtrQ->front==NULL;
}
int main(){
Queue PtrQ;
InintQueue(PtrQ);
for(int i = 0;i<10;i++)
EnQueue(PtrQ,i);
while(!Is_EmptyQ(PtrQ))
printf("%d\n",DeleteQ(PtrQ));
return 0;
}