C++//文件读取数据，后怎么建立链表

#include <iostream>
#include <string>
#include <cstring>
#include <fstream>
using namespace std;

struct table{
    int id;
    char name[10];
    int age;
    table* next;
};

void Create()
{
    table* head=NULL,*tail=NULL,*memory=NULL;
    string str("Yes");
    char choice[4]="";
    do{
        memory = new table;
        cout<<"input new student on the table.txt"<<endl;
        cout<<"input the student's id:"<<endl;
        cin>>id;
        cout<<"input the student's name:"<<endl;
        cout.flush();
        cin>>name;
        cout<<"input the studen's age"<<endl;
        cin>>age;
        new -> next = NULL;
        if(head==NULL&&tail==NULL)
        {
            head=memory;
            tail=memory;
        }
        else
        {
            tail->next=memory;
            tail=memory;
        }
        printf("choose Y to go ahead,choose N to quit:");
        cout.flush();
        cin>>choice;
    }while(str==choice);
    ofRead("table.txt",head);
    delete memory;
}

void ofRead(char* file,table* head)
{
    ofstream of(""file"");
    of.seekp(0,ios::beg);
    table* cur=head;
    do{
        of<<cur->id<<' '<<cur->name<<' '<<cur->age<<' ';
        cur=cur->next;
    }while(cur==NULL);
    of.close();
}

table* ofWrite(char* file)
{
    table* head=NULL,*cur=NULL,*memory=NULL;
    ifstream iff(""file"");
    iff.seekg(0,ios::beg);
    char str[8]="";
    while(iff.getline(str,sizeof(str),' '))
        memory = new table;
        //文件读取数据，后如何建立链表？

    iff.close();
    return head;
}

void revise(table* head)
{
    cout<<"input student's id that you want to midfy"<<endl;
    int id_modfiy;
    table* cur=head;
    while(cur!=NULL)
    {
        if(cur->id==id_modfiy)
        {
            cout<<"1.Do you want to modify the student's id"
                <<"2.Do you want to modify the student's name"
                <<"3.Do you want to modify the student's age"
                <<"4.Do you want to modify the student's whole information"
                endl;
            int choice;
            cin>>choice;
            switch(choice)
            (
                case 1:cin>>cur->id;break;
                case 2:cin>>cur->name;break;
                case 3:cin>>cur->age;break;
                case 4:cin>>cur->id>>cur->name>>cur->age;break;
            )
        }
        cur=cur->next;
    }
    ofRead(name,head);
}

int main()
{
    Create();
    cout<<"Do you want to modify the student information?(yes or no)"<<endl;
    string str("yes");
    char choice[4]="";
    cin>>choice;
    if(str==choice)
    {
        char name[10]="";
        cout<<"input student's information table file name"<<endl;
        cin>>name;
        table* head=ifWrite(name);
        revise(head);
    }
    if(strcmp(choice=="no")==0)
    {
        cout<<"your operaion complete."<<endl;
    }
}

#include <iostream>
#include <string>
#include <cstring>
#include <fstream>
using namespace std;

struct table{
    int id;
    char name[10];
    int age;
    table* next;
};

void ofRead(char* file,table* head)//这儿提到前边来了
{
    ofstream of(file);
    of.seekp(0,ios::beg);
    table* cur=head;
    do{
        of<<cur->id<<' '<<cur->name<<' '<<cur->age<<' ';
        cur=cur->next;
    }while(cur==NULL);
    of.close();
}

void Create()
{
    table* head=NULL,*tail=NULL,*memory=NULL;
    string str("Yes");
    char choice[4]="";
    do{
        memory = new table;
        cout<<"input new student on the table.txt"<<endl;
        cout<<"input the student's id:"<<endl;
        cin>>memory->id;//这儿
        cout<<"input the student's name:"<<endl;
        cout.flush();
        cin>>memory->name;//这儿
        cout<<"input the studen's age"<<endl;
        cin>>memory->age;//这儿
        memory -> next = NULL;
        if(head==NULL&&tail==NULL)
        {
            head=memory;
            tail=memory;
        }
        else
        {
            tail->next=memory;
            tail=memory;
        }
        printf("choose Y to go ahead,choose N to quit:");
        cout.flush();
        cin>>choice;
    }while(str==choice);
    ofRead("table.txt",head);
    delete memory;
}

table* ifWrite(char* file)//这儿
{
    table* head=NULL,*cur=NULL,*memory=NULL;
    ifstream iff(file);
    iff.seekg(0,ios::beg);
    char str[8]="";
    while(iff.getline(str,sizeof(str),' '))
        memory = new table;
        //文件读取数据，后如何建立链表？

    iff.close();
    return head;
}

void revise(table* head)
{
    cout<<"input student's id that you want to midfy"<<endl;
    int id_modfiy;
    table* cur=head;
    while(cur!=NULL)
    {
        if(cur->id==id_modfiy)
        {
            cout<<"1.Do you want to modify the student's id"
                <<"2.Do you want to modify the student's name"
                <<"3.Do you want to modify the student's age"
                <<"4.Do you want to modify the student's whole information"
                <<endl;
            int choice;
            cin>>choice;
            switch(choice)
            {//这儿等等
                case 1:cin>>cur->id;break;
                case 2:cin>>cur->name;break;
                case 3:cin>>cur->age;break;
                case 4:cin>>cur->id>>cur->name>>cur->age;break;
            }
        }
        cur=cur->next;
    }
    ofRead(cur->name,head);
}

int main()
{
    Create();
    cout<<"Do you want to modify the student information?(yes or no)"<<endl;
    string str("yes");
    char choice[4]="";
    cin>>choice;
    if(str==choice)
    {
        char name[10]="";
        cout<<"input student's information table file name"<<endl;
        cin>>name;
        table* head=ifWrite(name);
        revise(head);
    }
    if(strcmp(choice,"no")==0)
    {
        cout<<"your operaion complete."<<endl;
    }
}