线性表（链式存储结构）

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

typedef int ElemType;

typedef struct Node{
    ElemType data;
    struct Node *next;
}ListNode;

typedef ListNode *LinkList; 

/**
***插入 
***/ 
void InsertList(LinkList head, int i, ElemType x)
{
    ListNode *p, *s; 
    int j = 0;
    p = head;
    while(p != NULL && j < i - 1) {
        p = p->next; 
        ++j;
    }
    if (p == NULL) {
        printf("ERROR\n");
        return ;
    } else {
        s = (ListNode *)malloc(sizeof(ListNode));
        s->data = x;
        s->next = p->next;
        p->next = s;
    }
}
/**
*** 删除 
**/
ElemType DeleteList(LinkList head, int i)
{
    ListNode *p, *s;
    ElemType x;
    int j = 0;
    p = head;
    while (p != NULL && j < i - 1) {
        p = p->next; ++j;
    }    
    if (p == NULL) {
        printf("position error\n");
        return -1;
    } else {
        s = p->next;
        p->next = s->next;
        x = s->data;
        free(s);
        return x;
    }
}

/**
**头插法 
**/
LinkList CreateListHead()
{
    LinkList head = NULL;
    ListNode *p;
    int ch;
    while( (ch = getchar() )!= ‘\n‘) {
        p = (ListNode *)malloc(sizeof(ListNode));
        p->data = ch;
        p->next = head;
        head = p;
    }
    return head;
}
/**
** 尾插法 
**/
LinkList CreateListTail() 
{
    LinkList head = (ListNode *)malloc(sizeof(ListNode));
    ListNode *p, *r;
    int ch;
    r = head;
    while( (ch = getchar()) != ‘\n‘) {
        p = (ListNode *)malloc(sizeof(ListNode));
        p->data = ch;
        r->next = p;
        r = p; 
    }
    r->next = NULL;
    return head;
}

ListNode *LocateNodek(LinkList head, ElemType k) 
{
    ListNode *p = head->next;
    while(p && p->data != k) {
        p = p->next;
    }    
    return p;
}

ListNode *GetNodei(LinkList head, int i) 
{
    ListNode *p; int j = 1;
    p = head->next;
    while( p!= NULL && j < i) {
        p = p->next; ++j;
    }
    if (j == i) 
        return p;
    else 
        return NULL;
}