静态链表的数组强制类型转换的问题!
#include <stdio.h> #include <malloc.h>
#include "StaticList.h"
#define AVAILABLE -1
typedef struct _tag_StaticListNode //静态链表一般结点的结构体
{
unsigned int data; //真正元素在数组中的数据
int next; //保存下一个元素在数组中的下标
} TStaticListNode;
typedef struct _tag_StaticList //静态链表头节点
{
int capacity; //链表容量
TStaticListNode header; //表头结点
TStaticListNode node[]; //容量结点成员的数组元素
} TStaticList;
StaticList* StaticList_Create(int capacity) // O(n)
{
TStaticList* ret = NULL;
int i = 0;
if( capacity >= 0 )
{
ret = (TStaticList*)malloc(sizeof(TStaticList) + sizeof(TStaticListNode) * (capacity + 1));
}
if( ret != NULL )
{
ret->capacity = capacity;
ret->header.data = 0;
ret->header.next = 0;
for(i=1; i<=capacity; i++) //数组元素归零
{
ret->node[i].next = AVAILABLE;
}
}
return ret;
}
void StaticList_Destroy(StaticList* list) // O(1)
{
free(list);
}
void StaticList_Clear(StaticList* list) // O(n)
{
TStaticList* sList = (TStaticList*)list;
int i = 0;
if( sList != NULL )
{
sList->header.data = 0; //复用header内的数据元素data用作length
sList->header.next = 0;
for(i=1; i<=sList->capacity; i++)
{
sList->node[i].next = AVAILABLE;
}
}
}
int StaticList_Length(StaticList* list) // O(1)
{
TStaticList* sList = (TStaticList*)list;
int ret = -1;
if( sList != NULL )
{
ret = sList->header.data; //header.data用来存放链表长度
}
return ret;
}
int StaticList_Capacity(StaticList* list) // O(1)
{
TStaticList* sList = (TStaticList*)list;
int ret = -1;
if( sList != NULL )
{
ret = sList->capacity;
}
return ret;
}
int StaticList_Insert(StaticList* list, StaticListNode* node, int pos) // O(n)
{
TStaticList* sList = (TStaticList*)list;
int ret = (sList != NULL);
int current = 0;
int index = 0;
int i = 0;
ret = ret && (sList->header.data + 1 <= sList->capacity);
ret = ret && (pos >=0) && (node != NULL);
if( ret )
{
for(i=1; i<=sList->capacity; i++)
{
if( sList->node[i].next == AVAILABLE ) //判断第i个元素是否可用（使用过的就不行了哟）
{
index = i;
break;
}
}
sList->node[index].data = (unsigned int)node;//问题1：函数体内变量是StaticListNode的指针变量，直接强制转换当整形用了是不是有点不妥
sList->node[0] = sList->header;
for(i=0; (i<pos) && (sList->node[current].next != 0); i++) //木有到表尾~判断！
{
current = sList->node[current].next;
}
sList->node[index].next = sList->node[current].next;
sList->node[current].next = index;
sList->node[0].data++;
sList->header = sList->node[0]; //因为以上有一句data++所以表头信息发生了变化，故需要在此处更新表头信息
}
return ret;
}
StaticListNode* StaticList_Get(StaticList* list, int pos) // O(n)
{
TStaticList* sList = (TStaticList*)list;
StaticListNode* ret = NULL;
int current = 0;
int object = 0;
int i = 0;
if( (sList != NULL) && (0 <= pos) && (pos < sList->header.data) )
{
sList->node[0] = sList->header; //静态链表规定将第0个元素当做表头
for(i=0; i<pos; i++)
{
current = sList->node[current].next;
}
object = sList->node[current].next;
ret = (StaticListNode*)(sList->node[object].data);
}
return ret;
}
StaticListNode* StaticList_Delete(StaticList* list, int pos) // O(n)
{
TStaticList* sList = (TStaticList*)list;
StaticListNode* ret = NULL;
int current = 0;
int object = 0;
int i = 0;
if( (sList != NULL) && (0 <= pos) && (pos < sList->header.data) )
{
sList->node[0] = sList->header;
for(i=0; i<pos; i++)
{
current = sList->node[current].next;
}
object = sList->node[current].next;
sList->node[current].next = sList->node[object].next;
sList->node[0].data--;
sList->header = sList->node[0];
sList->node[object].next = AVAILABLE;
ret = (StaticListNode*)(sList->node[object].data);
}
return ret;
}
int main(int argc, char *argv[])
{
StaticList* list = StaticList_Create(10);
int index = 0;
int i = 0;
int j = 1;
int k = 2;
int x = 3;
int y = 4;
int z = 5;
StaticList_Insert(list, &i, 0);
StaticList_Insert(list, &j, 0);
StaticList_Insert(list, &k, 0);
for(index=0; index<StaticList_Length(list); index++)
{
int* p = (int*)StaticList_Get(list, index);
printf("%d\n", *p);
}
printf("\n");
while( StaticList_Length(list) > 0 )
{
int* p = (int*)StaticList_Delete(list, 0);
printf("%d\n", *p);
}
printf("\n");
StaticList_Insert(list, &x, 0);//问题：main函数中直接以int的地址代替了大指针。。。也没有用强制转换StaticListNode*但是程序运行正常！
StaticList_Insert(list, &y, 0);
StaticList_Insert(list, &z, 0);
printf("Capacity: %d Length: %d\n", StaticList_Capacity(list), StaticList_Length(list));
for(index=0; index<StaticList_Length(list); index++)
{
int* p = (int*)StaticList_Get(list, index);
printf("%d\n", *p);
}
StaticList_Destroy(list);
return 0;
}
//以上是静态链表程序，基本懂，还是强制类型转换不懂，实在是有点活，指针转着当整形用~驾驭不了啊~~怎样才能灵活掌握呢？
