问题描述
- 关于c++将文件内容读取到链表中
-
解决方案
#include<string>
#include<iostream>
#include<fstream>
#include <stdlib.h>
using namespace std;
class Person
{
protected:
string name;
int age;
string sex;
};
class Doctor:public Person
{
public:
void show();
void del();
void add();
void refer();
void save();
void open();
Doctor *get();
Doctor *find_d(int card);
protected:
string spe;
double fee;
int son_d;
//private:
public:
Doctor *next,*head,*prece;
};
void Doctor::open()
{
FILE *fp;
Doctor *p1,*p2;
head=new Doctor;
head->prece=NULL;
p1=head;
ifstream infile("file.txt",ios::in|ios::binary);
p2=new Doctor;
while(infile.read((char*)p2,sizeof(Doctor)))
{
cout<<p2->age;
p1->next=p2;
p2->prece=p1;
p1=p2;
cout<<"aaaa"<<endl;
p2=new Doctor;
}
p1->next = NULL;
infile.close();
}
void Doctor::save()
{
Doctor *p;
p=head->next;
fstream outfile("file.txt",ios::out|ios::binary);
if(!outfile)
{
cout<<"打开文件失败！"<<endl;
}
else
{
while(p)
{
outfile.write((char *)p,sizeof(Doctor));
p=p->next;
cout << "haha" << endl;
}
}
outfile.close();
}
Doctor* Doctor::find_d(int card)
{
int card2;
Doctor *p;
p=head->next;
while(p)
{
card2=p->son_d;
if(card2==card)
{
return p;
}
else
{
p=p->next;
}
if(!p)
{
return p=NULL;
}
}
}
Doctor* Doctor::get()
{
Doctor *p=new Doctor;
cout<<" 姓名:";
cin>>p->name;
cout<<" 医生编号:";
cin>>p->son_d;
cout<<" 年龄:";
cin>>p->age;
cout<<" 性别:";
cin>>p->sex;
cout<<" 专业:";
cin>>p->spe;
cout<<" 诊费:";
cin>>p->fee;
return p;
}
void Doctor::add()
{
Doctor *p1,*p2;
char y;
p1=head;
cout<<"请输入要添加的医生信息:"<<endl;
p2=get();
if(p1->next!=NULL)
p1->next->prece=p2;
if(p1->next==NULL)
p2->next=NULL;
p2->prece=p1;
p2->next=p1->next;
p1->next=p2;
cout<<"医生信息添加成功！"<<endl;
cout<<"是否继续添加医生信息？(y/n)"<<endl;
cin>>y;
if(y=='y'||y=='Y')
{
add();
}
else
{
return;
}
}
void Doctor::del()
{
int card;
Doctor *p;
cout<<"请输入要删除医生信息的医生编号:";
cin>>card;
p=find_d(card);
if(p==NULL)
{
cout<<"对不起！查无此人。"<<endl;
}
else
{
p->prece->next=p->next;
if(p->next!=NULL)
p->next->prece=p->prece;
delete p;
cout<<"删除成功！"<<endl;
}
}
void Doctor::refer()
{
Doctor *p;
cout<<"输入要查询的医生信息的医生编号:";
int card;
cin>>card;
p=find_d(card);
if(p==NULL)
{
cout<<"对不起！查无此人。"<<endl;
}
else
{
cout<<"姓名:";
cout<<p->name;
cout<<" 医生编号:";
cout<<p->son_d;
cout<<" 年龄:";
cout<<p->age;
cout<<" 性别:";
cout<<p->sex;
cout<<" 专业:";
cout<<p->spe;
cout<<" 诊费:";
cout<<p->fee;
}
}
void Doctor::show()
{
Doctor *p;
p=head->next;
while(p)
{
cout<<" 姓名:";
cout<<p->name;
cout<<" 医生编号:";
cout<<p->son_d;
cout<<" 年龄:";
cout<<p->age;
cout<<" 性别:";
cout<<p->sex;
cout<<" 专业:";
cout<<p->spe;
cout<<" 诊费:";
cout<<p->fee;
p=p->next;
cout<<endl;
}
}
int main()
{
Doctor d;
d.head = new Doctor;
d.head->prece = NULL;
d.head->next = NULL;
//d.add();
d.open();
d.show();
//d.save();
return 0;
}
解决方案二：
为什么链表读取完文件的内容后却输出不出来？？？
解决方案三：
而且我在读取中加入标示，标示读取了三次，说明读取成功了，但是为什么就是输出不出来？
解决方案四：
解决方案五：
你调试一下，在输出是看一下变量。
解决方案六：
不知道，为什么链表读取完文件的内容后却输出不出来？？？
解决方案七：
应该是你的read有问题
建议贴一下Doctor这个类
目测你Doctor类的name成员应该是个指针吧？不是一个字符数组吧，没有new过空间，直接read进去了，这样之后访问的时候肯定因为之前的越界写入而崩溃
解决方案八：
解决方案九：
#include<string>
#include<iostream>
#include<fstream>
#include <stdlib.h>
using namespace std;
class Person
{
protected:
string name;
int age;
string sex;
};
class Doctor:public Person
{
public:
void show();
void del();
void add();
void refer();
void save();
void open();
Doctor *get();
Doctor *find_d(int card);
protected:
string spe;
double fee;
int son_d;
private:
Doctor *next,*head,*prece;
};
void Doctor::open()
{
FILE *fp;
Doctor *p1,*p2;
p1=head;
ifstream infile("file.txt",ios::in|ios::binary);
while(!infile.eof())
{
p2=new Doctor;
infile.read((char*)p2,sizeof(Doctor));
cout<<p2->age;
p1->next=p2;
p2->prece=p1;
p1=p2;
cout<<"aaaa"<<endl;
}
infile.close();
}
void Doctor::save()
{
Doctor *p;
p=head->next;
fstream outfile("file.txt",ios::out|ios::binary);
if(!outfile)
{
cout<<"打开文件失败！"<<endl;
}
else
{
while(p)
{
outfile.write((char *)p,sizeof(Doctor));
p=p->next;
}
}
outfile.close();
}
Doctor* Doctor::find_d(int card)
{
int card2;
Doctor *p;
p=head->next;
while(p)
{
card2=p->son_d;
if(card2==card)
{
return p;
}
else
{
p=p->next;
}
if(!p)
{
return p=NULL;
}
}
}
Doctor* Doctor::get()
{
Doctor *p=new Doctor;
cout<<" 姓名:";
cin>>p->name;
cout<<" 医生编号:";
cin>>p->son_d;
cout<<" 年龄:";
cin>>p->age;
cout<<" 性别:";
cin>>p->sex;
cout<<" 专业:";
cin>>p->spe;
cout<<" 诊费:";
cin>>p->fee;
return p;
}
void Doctor::add()
{
Doctor *p1,*p2;
char y;
p1=head;
cout<<"请输入要添加的医生信息:"<<endl;
p2=get();
if(p1->next!=NULL)
p1->next->prece=p2;
if(p1->next==NULL)
p2->next=NULL;
p2->prece=p1;
p2->next=p1->next;
p1->next=p2;
cout<<"医生信息添加成功！"<<endl;
cout<<"是否继续添加医生信息？(y/n)"<<endl;
cin>>y;
if(y=='y'||y=='Y')
{
add();
}
else
{
return;
}
}
void Doctor::del()
{
int card;
Doctor *p;
cout<<"请输入要删除医生信息的医生编号:";
cin>>card;
p=find_d(card);
if(p==NULL)
{
cout<<"对不起！查无此人。"<<endl;
}
else
{
p->prece->next=p->next;
if(p->next!=NULL)
p->next->prece=p->prece;
delete p;
cout<<"删除成功！"<<endl;
}
}
void Doctor::refer()
{
Doctor *p;
cout<<"输入要查询的医生信息的医生编号:";
int card;
cin>>card;
p=find_d(card);
if(p==NULL)
{
cout<<"对不起！查无此人。"<<endl;
}
else
{
cout<<"姓名:";
cout<<p->name;
cout<<" 医生编号:";
cout<<p->son_d;
cout<<" 年龄:";
cout<<p->age;
cout<<" 性别:";
cout<<p->sex;
cout<<" 专业:";
cout<<p->spe;
cout<<" 诊费:";
cout<<p->fee;
}
}
void Doctor::show()
{
Doctor *p;
p=head->next;
while(p)
{
cout<<" 姓名:";
cout<<p->name;
cout<<" 医生编号:";
cout<<p->son_d;
cout<<" 年龄:";
cout<<p->age;
cout<<" 性别:";
cout<<p->sex;
cout<<" 专业:";
cout<<p->spe;
cout<<" 诊费:";
cout<<p->fee;
p=p->next;
cout<<endl;
}
}
int main()
{
Doctor d;
//d.add();
d.open();
d.show();
//d.save();
return 0;
}
解决方案十：
时间： 2025-01-25 19:02:35