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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct list
{
char name[20];
char phone[20];
struct list* next;
}*head = NULL;
void addPerson(struct list** head);
void getInput(struct list* person);
void findPerson(struct list* head);
void changePerson(struct list* head);
void delPerson(struct list* head);
void displayContacts(struct list* head);
void releasePerson(struct list** head);
void addPerson(struct list** head)
{
struct list* person, * temp;
person = (struct list*)malloc(sizeof(struct list));
if (person == NULL)
{
printf("分配内存失败。\n");
exit(1);
}
getInput(person);
if (*head!=NULL)
{
temp = *head;
*head = person;
person->next = NULL;
}
else
{
*head = person;
person->next = NULL;
}
}
void getInput(struct list* person)
{
printf("请输入联系人姓名:\n");
scanf("%s", &person->name);
printf("请输入联系人电话。\n");
scanf("%s", &person->phone);
}
void findPerson(struct list* head)
{
char ch[25];
printf("请输入联系人姓名:\n");
scanf("%s", ch);
while (strcmp(head->name,ch)&&head!=NULL)
{
head = head->next;
}
if (head==NULL)
{
printf("没有此联系人\n");
}
else
{
printf("姓名:%s", head->name);
printf("电话号码:%s", head->phone);
}
}
void changePerson(struct list*head)
{
char ch[25];
int num = 1;
printf("请输入联系人姓名:\n");
scanf("%s", ch);
while (strcmp(head->name, ch) && head != NULL)
{
head = head->next;
}
if (head == NULL)
{
printf("没有此联系人\n");
}
else
{
while (num)
{
printf("1.改写名字 2.改写姓名 0.退出\n");
scanf("%d", &num);
switch (num)
{
case 0:
printf("退出\n");
break;
case 1:
printf("请输入姓名。\n");
scanf("%s", &head->name);
break;
case 2:
printf("请输入电话。\n");
scanf("%s", head->phone);
break;
default:
printf("输入错误");
break;
}
}
}
}
void delPerson(struct list* head)
{
char ch[20];
printf("请输入姓名。\n");
scanf("%s", &ch);
struct list* previous, * current;
current = head;
while (strcmp(current->name,ch)&¤t!=NULL)
{
previous = current;
current = current->next;
}
if (current == NULL)
{
printf("没有此联系人\n");
}
else
{
previous->next = current->next;
free(current);
}
}
void displayContacts(struct list* head)
{
while (head!=NULL)
{
printf("姓名:%s 电话:%s\n",head->name,head->phone);
head = head->next;
}
}
void releasePerson(struct list** head)
{
struct list* temp;
while (*head!=NULL)
{
temp = *head;
*head = (*head)->next;
free(temp);
}
}
int main(void)
{
int num = 1;
while (num)
{
printf("请输入(1-6):\n");
printf("请输入命令:\n.....||1(添加新的联系人) ||.....\n.....||2:(查找联系人) ||.....\n.....||3:(更改联系人) ||.....\n.....||4:(删除联系人) ||.....\n.....||5:(查看所有联系人)||.....\n.....||6:(退出) ||.....");
scanf("%d", &num);
switch (num)
{
case 1:
addPerson(&head);
break;
case 2:
findPerson(head);
break;
case 3:
changePerson(head);
break;
case 4:
delPerson(head);
break;
case 5:
displayContacts(head);
break;
case 6:
printf("提出系统.\n");
releasePerson(&head);
break;
default:
break;
}
}
return 0;
}
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