链式队列 + 顺序队列 + 顺序循环队列

#include <stdio.h>
#include <stdlib.h>

#define OK 1
#define FALSE 0
#define ERROR -1

typedef int Status;
typedef int QElemType;

typedef struct QNode
{
    QElemType data;
    QNode *next;
}*QueuePtr;

struct LinkQueue
{
    QueuePtr front,rear;//队头，队尾指针
};

Status InitQueue(LinkQueue &Q)
{
    Q.front->next = NULL;
    return OK;
}

Status DestroyQueue(LinkQueue &Q)
{
    while(Q.front){
        Q.rear = Q.front->next;
        free(Q.front);
        Q.front = Q.rear;
    }
    return OK;
}

Status ClearQueue(LinkQueue &Q)
{
    QueuePtr p,q;
    Q.rear = Q.front;
    p = Q.front->next;
    Q.front->next = NULL;
    while(p){
        q = p;
        p = p->next;
        free(q);
    }
    return OK;
}

Status QueueEmpty(LinkQueue Q){
    if(Q.front == Q.rear)
        return true;
    else
        return false;
}

int QueueLength(LinkQueue Q){
    int i = 0;
    QueuePtr p;
    p = Q.front;
    while(Q.rear != Q.front){
        i++;
        p = p->next;
    }
    return i;
}

Status GetHead(LinkQueue Q,QElemType &e){
    QueuePtr p;
    if(Q.front == Q.rear)
        return ERROR;
    p = Q.front->next;
    e = p->data;
    return OK;
}

Status EnQueue(LinkQueue &Q,QElemType e){
    QueuePtr p = (QueuePtr)malloc(sizeof(QNode));
    p->data = e;
    p->next = NULL;
    Q.rear->next = p;
    Q.rear = p;
    return OK;
}

Status DeQueue(LinkQueue &Q,QElemType &e){
    QueuePtr p;
    if(Q.front == Q.rear)
        return ERROR;
    p = Q.front->next;
    e = p->data;
    Q.front->next = p->next;
    if(Q.rear == p)
        Q.rear = Q.front;
    free(p);
    return OK;
}

Status QueueTraverse(LinkQueue Q,void(*vi)(QElemType))
{
    QueuePtr p;
    p = Q.front->next;
    while(p){
        vi(p->data);
        p = p->next;
    }

    printf("\n");
    return OK;
}

int main()
{
    return 0;
}

顺序队列：

//顺序队列
#include <stdio.h>
#include <stdlib.h>

#define OK 1
#define FALSE 0
#define ERROR -1
#define OVERFLOW -1
#define MAXQSIZE 20 

typedef int Status;
typedef int QElemType;

struct SqQueue
{
    QElemType *base;
    int front;
    int rear;
};

Status InitQueue(SqQueue &Q){
    Q.base = (QElemType *)malloc(MAXQSIZE * sizeof(QElemType));
    //
    Q.front = Q.rear = 0;
    return OK;
}

Status DestroyQueue(SqQueue &Q){
    if(Q.base)
        free(Q.base);
    Q.base = NULL;
    Q.front = Q.rear = 0;
    return 0;
}

Status ClearQueue(SqQueue &Q){
    Q.front = Q.rear = 0;
    return OK;
}

Status QueueEmpty(SqQueue Q){
    if(Q.front == Q.rear)
        return true;
    else
        return false;
}

int QueueLength(SqQueue Q){
    return (Q.rear - Q.front);
}

Status GetHead(SqQueue Q,QElemType &e){
    if(Q.front == Q.rear)
        return ERROR;
    e = *(Q.base + Q.front);
    return OK;
}

Status EnQueue(SqQueue &Q,QElemType e){
    if(Q.rear >= MAXQSIZE)
    {
        Q.base = (QElemType *)realloc(Q.base,(Q.rear + 1) * sizeof(QElemType));
        //
    }
    *(Q.base + Q.rear) = e;
    Q.rear++;
    return OK;
}

Status DeQueue(SqQueue &Q,QElemType e){
    if(Q.front == Q.rear)
        return ERROR;
    e = Q.base[Q.front];
    Q.front = (Q.front + 1);
    return OK;
}

Status QueueTraverse(SqQueue Q,void(*vi)(QElemType)){
    int i ;
    i = Q.front;
    while(i != Q.rear){
        vi(*(Q.base + i));
        i++;
    }
    printf("\n");
    return OK;
}

顺序循环队列：

//顺序循环队列
#include <stdio.h>
#include <stdlib.h>

#define OK 1
#define FALSE 0
#define ERROR -1
#define OVERFLOW -1
#define MAXQSIZE 5 

typedef int Status;
typedef int QElemType;

struct SqQueue
{
    QElemType *base;
    int front;
    int rear;
};

Status InitQueue(SqQueue &Q){
    Q.base = (QElemType *)malloc(MAXQSIZE * sizeof(QElemType));
    //
    Q.front = Q.rear = 0;
    return OK;
}

Status DestroyQueue(SqQueue &Q){
    if(Q.base)
        free(Q.base);
    Q.base = NULL;
    Q.front = Q.rear = 0;
    return 0;
}

Status ClearQueue(SqQueue &Q){
    Q.front = Q.rear = 0;
    return OK;
}

Status QueueEmpty(SqQueue Q){
    if(Q.front == Q.rear)
        return true;
    else
        return false;
}

int QueueLength(SqQueue Q){
    return (Q.rear - Q.front + MAXQSIZE) % MAXQSIZE;
}

Status GetHead(SqQueue Q,QElemType &e){
    if(Q.front == Q.rear)
        return ERROR;
    e = *(Q.base + Q.front);
    return OK;
}

Status EnQueue(SqQueue &Q,QElemType e){
    if((Q.rear + 1) % MAXQSIZE == Q.front) //队满
        return ERROR;
    Q.base[Q.rear] = e;
    Q.rear = (Q.rear + 1) % MAXQSIZE;
    return OK;
}

Status DeQueue(SqQueue &Q,QElemType e){
    if(Q.front == Q.rear)
        return ERROR;
    e = Q.base[Q.front];
    Q.front = (Q.front + 1) % MAXQSIZE;
    return OK;
}

Status QueueTraverse(SqQueue Q,void(*vi)(QElemType)){
    int i ;
    i = Q.front;
    while(i != Q.rear){
        vi(*(Q.base + i));
        i = (i + 1) % MAXQSIZE;
    }
    printf("\n");
    return OK;
}