编写一个电话簿，可以实现增删查找的功能

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
typedef struct telBook
{
    char name[100];
    char homeNum[15];
    char cellNum[15];
    struct telBook *next;
}*phoneBook;
int strEqu(char *string1,char *string2);
void creat();
void search();
void insert();
void delet();
void output();
struct telBook *book;
int main(void)                      
{
    int k;
    do
    {
        printf("  0:  exit\n");       
        printf("  1:  creat\n");
        printf("  2:  search\n");
        printf("  3:  insert\n");
        printf("  4:  delete\n");
        printf("  5:  output\n");
        printf("please select:");
        scanf("%d",&k);               
        switch(k)
        {
        case 0:
            exit(0);            
        case 1:
            creat( );
            break;
        case 2:
            search( );
            break;
        case 3:
            insert( );
            break;
       case 4:
            delet( );
            break;
        case 5:
            output( );
            break;      
        default:
            exit(0);
        }
    }
    while(1);
    return 0;
}

void creat()
{
    phoneBook input;
    phoneBook p;
   // char flag[2] = "0";
    book = (phoneBook)malloc(sizeof(struct telBook));
    book->next=NULL;
    p = book;
    do
    {
        input = (phoneBook)malloc(sizeof(struct telBook));
        printf("请输入要创建的用户的信息：姓名、宅电、手机\n");
        printf("当输入0 0 0时退出创建\n");
        scanf("%s%s%s",input->name,input->homeNum,input->cellNum);
        if(strcmp(input->name,"0")!=0)
        {
            p->next = input;
            p = input;
            p->next = NULL;
        }
        else
        {
            break;
        }
    }while(1);
}
void search()
{
    char hostName[100];
    phoneBook p = book->next;
    printf("请输入要查找人的姓名:\t");
    scanf("%s",hostName);
    while(p!=NULL)
    {
        if(strcmp(p->name,hostName)==0)
            printf("宅电为：%s\t手机为：%s\n",p->homeNum,p->cellNum);
        else
            continue;
        p = p->next;
    }
}
void output()
{
    phoneBook p = book->next;
    printf("姓名\t宅电\t手机\n");
    while(p!=NULL)
    {
        printf("%s\t%s\t%s\n",p->name,p->homeNum,p->cellNum);
        p = p->next;
    }
}
void insert()
{
    phoneBook input = (phoneBook)malloc(sizeof(struct telBook));
    phoneBook p = book;
    phoneBook q = book->next;
    printf("请输入要创建的用户的信息：姓名、宅电、手机n");
    printf("当输入0 0 0时退出创建\n");
    scanf("%s%s%s",input->name,input->homeNum,input->cellNum);
    if(strcmp(input->name,"0")!=0)
    {
        p->next = input;
        p = input;
        p->next = q;
    }
}
/*void delete()
{
    phoneBook p = book->next;
    phoneBook q;
    while(p!=NULL)
    {
        q = p;
        p = p->next;
        free(q);
    }
    book->next = NULL;
}*/
void delet()
{
	char delname[100];
	phoneBook p=book;
	phoneBook q=book->next;
    printf	("请输入被删除的人的名字：\n" );
    scanf(" %s",delname); 
    while(strcmp(q->name,delname)!=0)
	{
		p=q;
		q=q->next;
	} 
	if(strcmp(delname,q->name)==0)
    {
       // p->next = input;
       // p = input;
       // p->next = q;
       p->next=q->next;
    }
}