这是前面我讲得算法与数据结构中链表的综合，如果这里不明白请看前面的基础知识：链接地址。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* 定义一个结构体 */
typedef struct NAME{
char *name;
struct NAME *pre;
struct NAME *next;
}T_Name, *PT_Name;
static PT_Name g_ptNameHead; /* 定义链表头 */
void add_name(PT_Name ptNew)
{
PT_Name ptCur;
if (g_ptNameHead == NULL)
{
g_ptNameHead = ptNew;
}
else
{
ptCur = g_ptNameHead;
while (ptCur->next)
{
ptCur = ptCur->next;
}
ptCur->next = ptNew;
ptNew->pre = ptCur;
}
}
void del_name(PT_Name ptDel)
{
PT_Name ptCur;
PT_Name ptPre;
PT_Name ptNext;
if (g_ptNameHead == ptDel) /* 如果链表头等于当前删除的链表 */
{
g_ptNameHead = ptDel->next;
/* 释放 */
return;
}
else
{
ptCur = g_ptNameHead->next;
while (ptCur)
{
if (ptCur == ptDel)
{
/* 从链表中删除 */
ptPre = ptCur->pre;
ptNext = ptCur->next;
ptPre->next = ptNext;
if (ptNext)
{
ptNext->pre = ptPre;
}
break;
}
else
{
ptCur = ptCur->next;
}
}
}
free(ptDel->name);
free(ptDel);
}
void add_one_name()
{
PT_Name ptNew;
char *str;
char name[128];
printf("enter the name:");
scanf("%s", name);
str = malloc(strlen(name) + 1);
/* name是一个局部变量，用来存放名字，当这个函数结束的时候，该内存就得释放，所以我们得单独分配一块内来存放这个name ,下面还得用malloc来分配一个结构体大的内存空间，记住我们定义结构体的时候不能添加static，因为定义结构提示不会分配内存空间的，他定义的只是这种类型，所以我们增加的时候一定要记得分配内存*/
strcpy(str, name);
ptNew = malloc(sizeof(T_Name));
ptNew->name = str;
ptNew->pre = NULL;
ptNew->next = NULL;
add_name(ptNew);
}
PT_Name get_name(char *name)
{
PT_Name ptCur;
if (g_ptNameHead == NULL)
{
return NULL;
}
else
{
ptCur = g_ptNameHead;
do {
if (strcmp(ptCur->name, name) == 0)
return ptCur;
else
ptCur = ptCur->next;
}while (ptCur);
}
return NUL;
}
void del_one_name()
{
PT_Name ptFind;
char name[128];
printf("enter the name:");
scanf("%s", name);
ptFind = get_name(name);
if (ptFind == NULL)
{
printf("do not have this name\n");
return ;
}
del_name(ptFind);
}
void list_all_name(void)
{
PT_Name ptCur;
int i = 0;
ptCur = g_ptNameHead;
while (ptCur)
{
printf("%02d : %s\n", i++, ptCur->name);
ptCur = ptCur->next;
}
}
int main(int argc, char **argv)
{
char c;
while (1)
{
printf("<l> List all the names\n");
printf("<a> add one name\n");
printf("<d> del one name\n");
printf("<x> exit\n");
printf("Enter the choise: ");
c = getchar();
switch (c)
{
case 'l':
{
list_all_name();
break;
}
case 'a':
{
add_one_name();
break;
}
case 'd':
{
del_one_name();
break;
}
case 'x':
{
return 0;
break;
}
default:
{
break;
}
}
}
return 0;
}