求解链表问题！！

[knorry089]

#include"iostream"
#include<string>
#include<fstream>
#include<sstream>
#include<iomanip>
using namespace std;

class student{
public:int id;
string name;
student *next;

student(int nid=0,string nname="noname");
} ;
student::student(int nid,string nname){id=nid;name=nname;}

class stunode{
student *head;
public:
stunode();
void linsert();
bool ldelete(int nid);
void show();
void doview();
};
stunode::stunode(){head=NULL;}

void stunode::linsert()
{student *p=new student();
cout<<"请输入学号：";
cin>>p->id;
cout<<"请输入姓名：";
cin>>p->name;

if(!head)
{head=p;}
else {
p->next=head;
head=p;
}

}
void stunode::show()
{student *p=head;
cout<<setw(10)/*设置输出宽度*/<<"学号"<<setw(8)<<"姓名"<<endl;

while(p){
cout<<setw(10)<<p->id<<setw(8)<<p->name<<endl;
p=p->next;
}
doview();
}
void stunode::doview()
{while(1){cout<<"1inter"<<"!!"<<"2show"<<"!!"<<"0exit"<<endl;
char n;
cin>>n;
switch(n)
{
case '1':
linsert();break;
case '2':
show();break;

}
}
}

main()
{stunode s;
s.doview();
}


当选择2 显示结果的时候，显示完后会出现错误，，初学 ，不会调试，求大师指点！！

[summer_insects]

内存泄露伤不起

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <iomanip>
using namespace std;

class Student
{
public:
    int id;
    string name;
    Student *next;

    Student(int nid = 0, string nname = "noname", Student *pnext = NULL):
        id(nid), name(nname), next(pnext) { }
};

class StuNode
{
    Student *head;
public:
    StuNode() { head = NULL; }
    ~StuNode();
    void linsert();
    bool ldelete(int nid);
    void show();
    void doview();
};

StuNode::~StuNode()
{
    Student *p = head, *q;
    while (p->next != NULL)
    {
        q = p;
        p = p->next;
        delete q;
    }
}

void StuNode::linsert()
{
    Student *p = new Student();
    cout << "请输入学号：";
    cin >> p->id;
    cout << "请输入姓名：";
    cin >> p->name;

    p->next = head;
    head = p;
}

void StuNode::show()
{
    Student *p = head;
    cout << setw(10) << "学号" << setw(8) << "姓名" << endl;

    while (p)
    {
        cout << setw(10) << p->id << setw(8) << p->name << endl;
        p = p->next;
    }
}

void StuNode::doview()
{
    char n;

    while (1)
    {
        cout << "1inter" << "!!" << "2show" << "!!" << "0exit" << endl;
        cin >> n;

        switch(n)
        {
        case '1':
            linsert();
            break;
        case '2':
            show();
            break;
        case '0':
            return;
        default:
            break;
        }
    }
}

int main()
{
    StuNode s;
    s.doview();
    return 0;
}

[summer_insects]

[Quote=引用 1 楼 的回复:]

内存泄露伤不起
C/C++ code

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <iomanip>
using namespace std;

class Student
{
public:
int id;
string name;
Stu……
[/Quote]

其实头文件只要
#include <iostream>
#include <string>
#include <iomanip>
就可以了

[summer_insects]

析构函数再改一下
StuNode::~StuNode()
{
    Student *p = head, *q;
    while (p != NULL)
    {
        q = p;
        p = p->next;
        delete q;
    }
}

[PANHL97]

void stunode::linsert()
{student *p=new student();
cout<<"请输入学号：";
cin>>p->id;
cout<<"请输入姓名：";
cin>>p->name;

if(!head)
{head=p;
head->next=NULL;
_______________
没这个导致你用SHOW时链表取到最后一个时出错
}
else {
p->next=head;
head=p;
}

}

[kobemadi]

1楼的好规范啊.

[knorry089]

多谢各位，，又进步一点点了

[knorry089]

[Quote=引用 2 楼 的回复:]

引用 1 楼 的回复:

内存泄露伤不起
C/C++ code

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <iomanip>
using namespace std;

class Student
{
public:
int id;
……
[/Quote]准备有文件，不影响编译很多都没有去掉，还是谢谢，，以后一点严谨，