详解C语言之单链表

#include <stdio.h>
#include <stdlib.h>
typedef int DataType;//给int起个别名，方便以后修改
typedef struct Node
{
	DataType data;//数据域
	struct Node *next;//指针域
}SLNode;
//初始化
void ListInit(SLNode **head)
{
	*head = (SLNode *)malloc(sizeof(SLNode));//申请头结点
	(*head)->next = NULL;
}
//求当前数据元素个数
int ListLength(SLNode *head)
{
	SLNode *p = head;
	int size = 0;
	while (p->next != NULL)
	{
		p = p->next;
		size++;
	}
	return size;
}
//插入
int ListInsert(SLNode *head, int i, DataType x)
{
	SLNode *p, *q;
	int j;
	p = head;
	j = -1;
	while (p->next != NULL && j < i - 1)
	{
		p = p->next;
		j++;
	}
	if (j != i - 1)
	{
		printf("插入参数位置错误！！！\n");
		return 0;
	}
	q = (SLNode *)malloc(sizeof(SLNode));//生成新结点
	q->data = x;
	q->next = p->next;
	p->next = q;
	return 1;
}
//删除
int ListDelete(SLNode *head, int i, DataType *x)
{
	SLNode *p, *q;
	int j;
	p = head;
	j = -1;
	while (p->next != NULL && p->next->next != NULL && j < i - 1)
	{
		p = p->next;
		j++;
	}
	if (j != i - 1)
	{
		printf("删除位置参数错误！！！\n");
		return 0;
	}
	q = p->next;
	*x = q->data;
	p->next = p->next->next;
	free(q);//释放被删除结点的内存空间
	return 1;
}
//按位取
int ListGet(SLNode *head, int i, DataType *x)
{
	SLNode *p;
	int j;
	p = head;
	j = -1;
	while (p->next != NULL && j < i)
	{
		p = p->next;
		j++;
	}
	if (j != i)
	{
		printf("取出位置参数错误！！！\n");
		return 0;
	}
	*x = p->data;
	return 1;
}
//释放
void ListDestroy(SLNode **head)
{
	SLNode *p, *q;
	p = *head;
	while (p != NULL)
	{
		q = p;
		p = p->next;
		free(q);
	}
	*head = NULL;
}

int main()
{
	SLNode *head;
	int i, x;
	ListInit(&head);
	for (i = 0; i < 10; i++)
		ListInsert(head, i, i + 10);
	ListDelete(head, 9, &x);
	for (i = 0; i < ListLength(head); i++)
	{
		ListGet(head, i, &x);
		printf("%d ", x);
	}
	ListDestroy(&head);
	system("pause");
	return 0;
}