用链表实现的手机通讯录

#include <stdio.h>
#include <stdlib.h> /*与malloc.h差不多*/
#include <string.h>
#define maxlen 100
struct persons
{ char name; /*定义结构体数组用于缓存数据*/
char addr[20];
char str1[20];
FILE *fp; /*定义文件指针*/
void creat() /*将文件的信息读入结构体数组在转存入链表中*/
{ int j;
long k;
fp=fopen("people.txt","r+t"); /*打开文件*/
strcpy(p3->phnum,name1);
}
}
}
void Save() /*保存信息*/
{ int j;
fp=fopen("people.txt","w");
for(p2=head,j=0;p2!=NULL;j++,p2=p2->next)/*将信息装出入结构体数组在出入链表中*/
struct lnode *next;
}listnode,*linklist;
linklist head=NULL,r=NULL; /*定义头指针和尾指针*/
listnode *s,*p0,*p1,*p2,*p3,*p4,*p5,*p6,*p7;
int i;
char name1,ch;
break;
case '2': Delete();
break;
case '3': Find();
break;
case '4': Input();
}
else
{ r->next=s;
r=s ;
}
}
}
else
{ fp=fopen("people.txt","w"); /*不能打开另开辟一个文件*/
i=1;
printf("\n\n\taddr:%s",p0->addr);
printf("\n\n\tphnum:%s",p0->phnum);
}
}
}
void Input() /*向通讯录中输入一个人的信息*/
{ s=(linklist)malloc(sizeof(listnode));
fread(&persons[i],sizeof(struct persons),1,fp);
s=(linklist)malloc(sizeof(listnode)); /*装存入链表中*/
strcpy(s->name,persons[i].name);
printf("\n\n\t\tphnum:");
scanf("%s",s->phnum);
if(head==NULL)
{ head=s;
}
else
{ r->next=s;
r=s;
}
}
void Alter() /*改变一个人的信息*/
printf("\n\n\t\tPlease make a choice below:");
printf("\n\t\t1.Show all the message");
printf("\n\t\t2.Delete a piece of message");
if(fp!=NULL)
{ for(i=1;i<maxlen;i++)
{ j=fgetc(fp);
if(j==EOF)
{ return;
}
k=i-1;
fseek(fp,k*sizeof(struct persons),0); /*读取一个人的信息*/
{ p4=p4->next;
p5=p4->next;
p4->next=p5->next;
free(p5);
}
}
}
void Find() /*查找的函数定义*/
p4=head;
if(strcmp(p4->name,==0)
{ p4=p4->next; /*根据各种情况判断可能性*/
head=p4;
}
else
{ while(strcmp(p4->next->name,name1)!=0) /*利用临时指针删除p4下一位的人的信息*/
}
}
void Show() /*显示所有的信息*/
{ p1=head;
while(p1!=NULL)
{ printf("\n\n\tname:%s\n",p1->name);
printf("\n\n\taddr:%s",p1->addr);
printf("\n\t\t6.Save and Exit");
printf("\n\n\n");
printf("\tInput Your Choice:");
ch=getchar();
switch(ch)
{ case '1': Show(); /*用单条件多选择语句实现调用与循环*/
{ printf("\n\n\tplease input the new meg!"); /*输入要改人的新信息*/
printf("\n\n\t\tname:");
scanf("%s",name1);
strcpy(p3->name,name1);
strcpy(s->addr,persons[i].addr);
strcpy(s->phnum,persons[i].phnum);
if(head==NULL) /*用尾插法将其插入链表中*/ /*即插入元素*/
{ head=s;
printf("\n\n\tplease input the sb's message:");
printf("\n\n\t\tname:");
scanf("%s",s->name);
printf("\n\n\t\tAddr:");
scanf("%s",s->addr);
{
p3=p3->next;
if(p3==NULL)
{ printf("\n\n\tIt is not exit in the addr-book!");
}
else if(strcmp(name1,p3->name)==0)
fwrite(&persons[j],sizeof(struct persons),1,fp);
}
}
void main()
{ creat();
do
{ printf("\n\n\n\n\tWELCOME TO USE WuBoWen's Address book");/*显示提示的信息*/
break;
default:
printf("\n\t*********************************\n");
if(p0==NULL)
{ printf("\n\n\tIt is not exit in the addr-book!");
}
else if(strcmp(name1,p0->name)==0)
{ printf("\n\n\tname:%s\n",p0->name);
printf("\n\t\t3.Find a piece of message");
printf("\n\t\t4.Insert a piece of message");
printf("\n\t\t5.Alter a piece of message");
printf("\n\n\t\tAddr:");
scanf("%s",name1);
strcpy(p3->addr,name1);
printf("\n\n\t\tphnum:");
scanf("%s",name1);
{ printf("\n\n\tplease input the name:");
p0=head;
gets(name1); /*查找人的姓名输入*/
while(strcmp(name1,p0->name)!=0&&p0!=NULL)
{ p0=p0->next;
printf("\n\n\tphnum:%s",p1->phnum);
p1=p1->next;
}
}
void Delete() /*定义一个删除的函数*/