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跟着小甲鱼敲的代码,
pool = pool->next;就说不允许指向不完整类类型
这里是全部代码:
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 1024
struct Person
{
char name[40];
char phone[20];
struct Person *next;
};
struct Preson *pool = NULL;
int count;
void getInput(struct Person *person);
void printPerson(struct Person *person);
void addPerson(struct Person **contacts);
void changePerson(struct Person *contacts);
void delPerson(struct Person **contacts);
struct Person *findPerson(struct Person *contacts);
void displayContacts(struct Person *contacts);
void releaseContacts(struct Person **contacts);
void releasePool(void);
void getInput(struct Person *person)
{
printf("请输入姓名:");
scanf("%s", person->name);
printf("请输入电话:");
scanf("%s", person->phone);
}
void addPerson(struct Person **contacts)
{
struct Person *person;
struct Person *temp;
//如果内存池非空,则直接从里面获取空间
if (pool != NULL)
{
person = pool;
pool = pool->next;<---------------------------------------------------------------------------这里
count--;
}
//如果内存池为空,则调用malloc函数申请新的内存空间
else
{
person = (struct Person *)malloc(sizeof(struct Person));
if (person == NULL)
{
printf("内存分配失败!\n");
exit(1);
}
}
getInput(person);
//将person用头插法添加到通讯录中
if (*contacts != NULL)
{
temp = *contacts;
*contacts = person;
person->next = temp;
}
else
{
*contacts = person;
person->next = NULL;
}
}
void printPerson(struct Person *person)
{
printf("联系人:%s\n", person->name);
printf("电话:%s\n", person->phone);
}
struct Person *findPerson(struct Person *contacts)
{
struct Person *current;
char input[40];
printf("请输入联系人:");
scanf("%s", input);
current = contacts;
while (current != NULL && strcmp(current->name, input))
{
current = current->next;
}
return current;
}
void changePerson(struct Person *contacts)
{
struct Person *person;
person = findPerson(contacts);
if (person == NULL)
{
printf("找不到该联系人!\n");
}
else
{
printf("请输入新的联系电话:");
scanf("%s", person->phone);
}
}
void delPerson(struct Person **contacts)
{
struct Person *person;
struct Person *current;
struct Person *previous;
struct Person *temp;
//先找到待删除的节点指针
person = findPerson(*contacts);
if (person == NULL)
{
printf("找不到该联系人!\n");
}
else
{
current = *contacts;
previous = NULL;
//current定位到待删除的节点
while (current != NULL && current != person)
{
previous = current;
current = current->next;
}
if (previous == NULL)
{
//待删除的节点是第一个节点
*contacts = current->next;
}
else
{
//待删除的节点不是第一个节点
previous->next = current->next;
}
//判断内存池是不是有空位
if (count < MAX)
{
if (pool != NULL)
{
temp = pool;
pool = person;
person->next = temp;
}
else
{
pool = person;
person->next = NULL;
}
count++;
}
else
{
free(person);
}
}
}
void displayContacts(struct Person *contacts)
{
struct Person *current;
current = contacts;
while (current != NULL)
{
printPerson(current);
current = current->next;
}
}
void releaseContacts(struct Person **contacts)
{
struct Person *temp;
while (*contacts != NULL)
{
temp = *contacts;
*contacts = (*contacts)->next;
free(temp);
}
}
void releasePool(void)
{
struct Person *temp;
while (pool != NULL)
{
temp = pool;
pool = pool->next;
free(temp);
}
}
int main(void)
{
int code;
struct Person *contacts = NULL;
struct Person *person;
printf("--欢迎使用通信录管理程序--\n");
printf("-----1.插入新的联系人-----\n");
printf("-----2.查找已有联系人-----\n");
printf("-----3.更改已有联系人-----\n");
printf("-----4.删除已有联系人-----\n");
printf("-----5.显示当前通讯录-----\n");
printf("-----6.推出通讯录程序-----\n");
while (1)
{
printf("\n请输入代码指令:");
scanf("%d", &code);
switch (code)
{
case 1:addPerson(&contacts);
break;
case 2:person = findPerson(contacts);
if (person == NULL)
{
printf("找不到该联系人!\n");
}
else
{
printPerson(person);
}
break;
case 3:changePerson(contacts);
break;
case 4:delPerson(&contacts);
break;
case 5:displayContacts(contacts);
break;
case 6:goto END;
}
}
END:
releaseContacts(&contacts);
releasePool();
return 0;
}
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