【发布时间】：2018-05-14 20:33:03
【问题描述】：
我花了几乎一整天的时间来尝试这样做，我了解指针和链表的作用，但我不知道如何实际编码它，我发现的只是 Java 和 C 示例无济于事，因为我使用的是 C++。 提前感谢您查看我的代码并帮助我，考虑到我花了多少天的时间为此感到压力和困惑，我真的很感激。到目前为止，我不会撒谎，我的大部分 deleteNode 函数可能都是垃圾。但就像我说过的，我只是迷路了，我什至不知道从哪里开始或如何进步，因为我只了解概念。
这是我的数据文件。
John Doe 80
Jane Smith 70
Bill Jones 50
Pat Hughes 90
Sam Sosa 40
这是我的头文件
#include<string>
using namespace std;
class student {
public:
student(); // constructor method
void st_fn(string fn);
string st_fn();
void st_ln(string ln);
string st_ln();
void st_score(float s);
float st_score();
string st_pass_or_fail();
// need a pointer to the next object
student *nxt_ptr;
protected: // protected can be inherited
float m_score;
string m_ln;
string m_fn;
string m_pf_msg;
};
student::student() //constructor
{
nxt_ptr = NULL;
m_score = 0;
}
void student::st_fn(string fn)
{
m_fn = fn;
}
string student::st_fn()
{
return m_fn;
}
void student::st_ln(string ln)
{
m_ln = ln;
}
string student::st_ln()
{
return m_ln;
}
void student::st_score(float s)
{
m_score = s;
}
float student::st_score()
{
return m_score;
}
string student::st_pass_or_fail()
{
if (m_score >= 60)
m_pf_msg = "PASSED";
else
m_pf_msg = "FAILED";
return m_pf_msg;
}
这是我的 .cpp 文件。
#include<iostream>
#include<string>
#include<fstream>
#include "Header.h"
using namespace std;
int display_menu()
{
int option;
cout << endl << endl;
cout << "1. Display List" << endl;
cout << "2. Add a student" << endl;
cout << "3. Delete first student" << endl;
cout << "4. Search by Last Name" << endl;
cout << "5. Exit" << endl;
cin >> option;
return option;
}
student * search_last_name(student *h)
{
student *f = NULL;
student *t = NULL;
string s_ln;
// prompt for last name to search for
cout << "Enter Last Name of the Student";
cin >> s_ln;
if (h != NULL)
{
t = h;
while (t != NULL)
{
if (t->st_ln() == s_ln)
f = t; // found the last name so save t
t = t->nxt_ptr;
}
}
else
cout << "List is empty" << endl;
return f;
}
void add_student(student *&head) // h is the head of the list
{
student *new_st, *r;
string fn, ln;
float s;
cout << "Enter new students first name, last name and score";
cin >> fn >> ln >> s;
// instantiate a new node, use new_st
new_st = new student;
new_st->st_fn(fn);
new_st->st_ln(ln);
new_st->st_score(s);
if (head == NULL)
head = new_st;
else
{
// find the last node, use r for this
// write code
r = head;
while (r->nxt_ptr != nullptr)
r = r->nxt_ptr;
// add to the back of the list
// write code
r->nxt_ptr = new_st;
} // end of else
} // end of add student
student * delete_front(student * head)
{
student *t;
// delete front node
// check for empty list
if (head != NULL)
{
// delete first node
t = head;
head = head->nxt_ptr;
delete(t);
}
else
cout << "List is empty - nothing to delete" << endl;
return head;
}
void deleteNode(struct Node *head, struct Node *n)
{
// When node to be deleted is head node
if (head == n)
{
n = head->next;
//Remove the link of next node
head->next = head->next->next;
return;
}
//When not first node, folow the normal deletion process
//Find the previous node
struct Node *prev = head;
while (prev->next != NULL && prev->next != n)
prev = prev->next;
// Check if node really exists in Linked List
if (prev->next == NULL)
{
cout << endl << "Given node is not present in Linked List";
return;
}
//Remove node from linked list should it exist
prev->next = prev->next->next;
return;
}
void display_list(student *t)
{
if (t == NULL)
cout << "List is Empty!";
else
{
while (t != NULL)
{
cout << "******Student******" << endl;
cout << t->st_ln() << endl;
cout << t->st_fn() << endl;
cout << t->st_score() << endl << endl;
t = t->nxt_ptr;
}
}
}
int main()
{
string ln, fn;
float s;
int n;
ifstream infile;
student *head = NULL; //pointer to a student object
student *cp = NULL; // pointer to end of the list
student *new_st = NULL; // pointer to a new student object
student *f = NULL; // pointer to found node
int option; // the numbe of menu item the user selects
infile.open("lab8d.txt");
while (!infile.eof())
{
infile >> fn >> ln >> s;
//instantiate a student object
new_st = new student;
//load the object with data
new_st->st_fn(fn);
new_st->st_ln(ln);
new_st->st_score(s);
// check for empty list - its a special case
if (head == NULL)
{
head = new_st;
cp = new_st;
}
else // list is not empty
{
cp->nxt_ptr = new_st;
cp = new_st;
}
} // end of loop
// loop to give the user some options
option = display_menu();
while (option != 5)
{
if (option == 1)
display_list(head);
else if (option == 2)
add_student(head);
else if (option == 3)
head = delete_front(head);
else if (option == 4)
{
f = search_last_name(head);
if (f != NULL)
{
cout << f->st_fn() << endl;
cout << f->st_ln() << endl;
cout << f->st_score() << endl;
cout << f->st_pass_or_fail() << endl;
}
else
cout << "Name not in the list" << endl;
}
else if (option == 6)
{
cout << "Enter the number of the node you would like to delete: " << endl;
cin >> n;
}
option = display_menu();
}
system("pause");
return 0;
}
【问题讨论】：
-
问题是不清楚你删除了什么以及应该保留什么。例如，如果一个头应该被删除，你会调用你的函数 deleteNode(head, head)。但是 head 是指向您的列表的指针。如果你调用这个函数，指向你的列表的指针不会改变，但是头节点会消失。我的意思是这是你程序中的一个基本问题。还有很多其他问题。我建议开始考虑接口
-
我建议将链表逻辑与所有其他逻辑分开。这使得测试和调试链表变得更加容易。让链表正常工作，然后添加Student，最后添加菜单系统。
-
注意
while (!infile.eof())这是一个非常常见的错误。好文章在这里：Why is iostream::eof inside a loop condition considered wrong? -
正如安德烈所说，不清楚您要删除什么以及何时删除。您知道如何删除一个节点，因此您需要能够决定是哪个节点并直接执行。那标准是什么？
-
@FeiXiang 是的，但至少他们会编译，并成为 OP 的起点，显然他们正在上一门教授 C'isms 的 C++ 课程。
标签： c++ linked-list