这时我的程序，请高手指点
#include<iostream.h>
#include<stdio.h>
#include<string.h>
#include<process.h>
class book
{friend class list;
private :char name[20];
char tele[11];
int n;
book*next;
};
class list
{private:book*head,*tail,*now;
public:
list();
void init(void);
void print1(void);
void add(void);
void search(void);
void del(void);
// void modify(void);
void exit(void);
};
int main(void)
{char ch;
cout<<"Hello!";
list list1;
list1.init();
L1:cout<<"press 1 to print the telephone book";
cout<<"press 2 to add record to the telephone book";
cout<<"press 3 to delete a record in the telephone book";
cout<<"press 4 to modify the telephone book";
cout<<"press 5 to search a record in the telephone book";
cout<<"press 6 to exit the program";
cin>>ch;
while(1)
{ switch(ch)
{case'1':list1.print1();break;
case'2':list1.add();break;
case'3':list1.del();break;
//case'4':list1.modify();break;
case'5':list1.search();break;
case'6':list1.exit();break;
default:
{cout<<"please input a right number";
goto L1;
}
break;
}
cin>>ch;
}
return 0;
}
list::list(void)
{head=tail=now=0;}
void list::print1(void)
{int i;
now=head;
cout<<"name telephone n "<<endl;
for(i=0;i<tail->n;i++)
{cout<<now->name<<" "<<now->tele<<" "<<now->n<<endl;
now=now->next;
}
}
void list::add(void)
{now=new book;
cout<<"name:";
cin>>now->name;
cout<<endl<<"telephone:";
cin>>now->tele;
now->n=tail->n+1;
tail->next=now;
tail=now;
}
void list::del(void)
{book*a;
char na[20];
int i,k=0;
char m;
cout<<"Input the name you want to delete:";
cin>>na;
now=a=head;
for(i=0;i<tail->n;i++)
if(!strcmp(a->name,na))
{ cout<<"name telephone n "<<endl;
cout<<a->name<<" "<<a->tele<<" "<<a->n<<endl;
k++;
cout<<"Do you want to delete it?(Y/N)";
cin>>m;
if(m=='y'||m=='Y')
{now->next=a->next;
delete a;
a=now->next;
}
}
else
{now=a;
a=a->next;
}
if(k==0)
cout<<"there is no such person";
}
void list::search(void)
{int i,k=0;
char na[20];
cout<<"Input the name you want to find:";
cin>>na;
now=head;
for(i=0;i<tail->n;i++)
if(!strcmp(now->name,na))
{ cout<<"This is the record you want to find:"<<endl;
cout<<"name telephone n "<<endl;
cout<<now->name<<" "<<now->tele<<" "<<now->n<<endl;
k++;
}
else
now=now->next;
if(k==0)
cout<<"there is no such person";
}
void list::exit(void)
{int i;
FILE*fp;
if((fp=fopen("telebook.dat","w"))==NULL)
cout<<"wrong";
else
cout<<"success";
now=head;
for(i=0;i<tail->n;i++)
{fwrite(now,sizeof(book),1,fp);
now=now->next;
}
fclose(fp);
now=head;
for(i=0;i<tail->n;i++)
{head=head->next;
delete now;
now=head;
}
exit();
}
void list::init(void)
{ FILE*fp;
book buffer;
cout<<"name:";
cin>>buffer.name;
cout<<endl<<"telephone:";
cin>>buffer.tele;
buffer.n=1;
if((fp=fopen("telebook.dat","w"))==NULL)
cout<<"wrong";
else
cout<<"success";
fwrite(&buffer,sizeof(book),1,fp);
fclose(fp);
if((fp=fopen("telebook.dat","r"))==NULL)
cout<<"wrong";
else
cout<<"success";
while(!feof(fp))
{fread(&buffer,sizeof(book),1,fp);
if(buffer.n==1)
{head=now=tail=new book;
strcpy(tail->name,buffer.name);
strcpy(tail->tele,buffer.tele);
tail->n=buffer.n;
}
else
{tail=new book;
now->next=tail;
strcpy(tail->name,buffer.name);
strcpy(tail->tele,buffer.tele);
tail->n=buffer.n;
}
fclose(fp);
}
}
