十、隊列的實現方法一（順序表的複用）

方法一、通過對順序表代碼的複用實現隊列

一、SeqList.h

#ifndef _SEQLIST_H_
#define _SEQLIST_H_


typedef void SeqList;
typedef void SeqListNode;


SeqList* SeqList_Create(int capacity);


void SeqList_Destroy(SeqList* list);


void SeqList_Clear(SeqList* list);


int SeqList_Length(SeqList* list);


int SeqList_Capacity(SeqList* list);


int SeqList_Insert(SeqList* list, SeqListNode* node, int pos);


SeqListNode* SeqList_Get(SeqList* list, int pos);


SeqListNode* SeqList_Delete(SeqList* list, int pos);


#endif

二、SeqList.c

#include <stdio.h>
#include <malloc.h>
#include "SeqList.h"


typedef unsigned int TSeqListNode;


typedef struct _tag_SeqList
{
    int capacity;
    int length;
    TSeqListNode* node;
} TSeqList;


SeqList* SeqList_Create(int capacity) // O(1)
{
    TSeqList* ret = NULL;
    
    if( capacity >= 0 )
    {
        ret = (TSeqList*)malloc(sizeof(TSeqList) + sizeof(TSeqListNode) * capacity);
    }
    
    if( ret != NULL )
    {
        ret->capacity = capacity;
        ret->length = 0;
        ret->node = (TSeqListNode*)(ret + 1);
    }
    
    return ret;
}


void SeqList_Destroy(SeqList* list) // O(1)
{
    free(list);
}


void SeqList_Clear(SeqList* list) // O(1)
{
    TSeqList* sList = (TSeqList*)list;
    
    if( sList != NULL )
    {
        sList->length = 0;
    }
}


int SeqList_Length(SeqList* list) // O(1)
{
    TSeqList* sList = (TSeqList*)list;
    int ret = -1;
    
    if( sList != NULL )
    {
        ret = sList->length;
    }
    
    return ret;
}


int SeqList_Capacity(SeqList* list) // O(1)
{
    TSeqList* sList = (TSeqList*)list;
    int ret = -1;
    
    if( sList != NULL )
    {
        ret = sList->capacity;
    }
    
    return ret;
}


int SeqList_Insert(SeqList* list, SeqListNode* node, int pos) // O(n) 
{
    TSeqList* sList = (TSeqList*)list;
    int ret = (sList != NULL);
    int i = 0;
    
    ret = ret && (sList->length + 1 <= sList->capacity);
    ret = ret && (0 <= pos);
    
    if( ret )
    {
        if( pos >= sList->length )
        {
            pos = sList->length;
        }
        
        for(i=sList->length; i>pos; i--)
        {
            sList->node[i] = sList->node[i-1];
        }
        
        sList->node[i] = (TSeqListNode)node;
        
        sList->length++;
    }
    
    return ret;
}


SeqListNode* SeqList_Get(SeqList* list, int pos) // O(1) 
{
    TSeqList* sList = (TSeqList*)list;
    SeqListNode* ret = NULL;
    
    if( (sList != NULL) && (0 <= pos) && (pos <= sList->length) )
    {
        ret = (SeqListNode*)(sList->node[pos]);
    }
    
    return ret;
}


SeqListNode* SeqList_Delete(SeqList* list, int pos) // O(n)
{
    TSeqList* sList = (TSeqList*)list;
    SeqListNode* ret = SeqList_Get(list, pos);
    int i = 0;
    
    if( ret != NULL )
    {
        for(i=pos+1; i<sList->length; i++)
        {
            sList->node[i-1] = sList->node[i];
        }
        
        sList->length--;
    }
    
    return ret;
}

三、SeqQueue.h

#ifndef _SEQQUEUE_H_
#define _SEQQUEUE_H_


typedef void SeqQueue;


SeqQueue* SeqQueue_Create(int capacity);  //創建隊列 


void SeqQueue_Destroy(SeqQueue* queue);  //銷燬隊列 


void SeqQueue_Clear(SeqQueue* queue);    //清空隊列 


int SeqQueue_Append(SeqQueue* queue, void* item);  //進隊列 
 
void* SeqQueue_Retrieve(SeqQueue* queue);    //出隊列 


void* SeqQueue_Header(SeqQueue* queue);   //獲取隊列頭元素 


int SeqQueue_Length(SeqQueue* queue);   //獲取隊列當前的長度 


int SeqQueue_Capacity(SeqQueue* queue);   //獲取隊列的容量 


#endif

四、SeqQueue.c

#include "SeqList.h"
#include "SeqQueue.h"


SeqQueue* SeqQueue_Create(int capacity) // O(1)
{
    return SeqList_Create(capacity);
}


void SeqQueue_Destroy(SeqQueue* queue) // O(1)
{
    SeqList_Destroy(queue);
}


void SeqQueue_Clear(SeqQueue* queue) // O(1)
{
    SeqList_Clear(queue);
}


int SeqQueue_Append(SeqQueue* queue, void* item) // queue爲隊列的地址，item爲插入元素的地址 
{
    return SeqList_Insert(queue, item, SeqList_Length(queue));   //從隊尾插入 
}


void* SeqQueue_Retrieve(SeqQueue* queue) // O(n)  
{
    return SeqList_Delete(queue, 0);   //從對頭刪除 
}


void* SeqQueue_Header(SeqQueue* queue) // O(1) 
{
    return SeqList_Get(queue, 0);
}


int SeqQueue_Length(SeqQueue* queue) // O(1)
{
    return SeqList_Length(queue);
}


int SeqQueue_Capacity(SeqQueue* queue) // O(1)
{
    return SeqList_Capacity(queue);
}

五、main.c

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


/* run this program using the console pauser or add your own getch, system("pause") or input loop */


int main(int argc, char *argv[]) 
{
    SeqQueue* queue = SeqQueue_Create(20);
    int a[10] = {0};
    int i = 0;
    
    for(i=0; i<10; i++)
    {
        a[i] = i + 1;
        
        SeqQueue_Append(queue, a + i);
    }
    
    printf("Header: %d\n", *(int*)SeqQueue_Header(queue));
    printf("Length: %d\n", SeqQueue_Length(queue));
    printf("Capacity: %d\n", SeqQueue_Capacity(queue));
    
    while( SeqQueue_Length(queue) > 0 )
    {
        printf("Retrieve: %d\n", *(int*)SeqQueue_Retrieve(queue));
    }
    
    SeqQueue_Destroy(queue);
    
return 0;
}