填写链表时出现分段错误

Segmentation fault from filling Linked List

本文关键字：分段 错误 链表      更新时间：2023-10-16

我已经在这里呆了 4.5 小时，试图弄清楚为什么这不起作用。还是没有运气。我不断遇到分段错误，或者尽管构建成功，但列表永远不会显示。

SimpleVector.h 

// SimpleVector class template
#ifndef SIMPLEVECTOR_H
#define SIMPLEVECTOR_H
#include <iostream>
#include <iomanip>
using namespace std;
class SimpleVector
{
private:
struct Link{
int data;
Link *next;
};
Link *head;
public:
// Default constructor
SimpleVector()
{head = NULL;}
// Destructor declaration
~SimpleVector();
void linkList(int);
//void insertLink(T);
void displayList();
};
//Destructor for SimpleVector
SimpleVector::~SimpleVector(){
Link *linkPtr;
Link *nextPtr;
nextPtr = head;
while(linkPtr !=  NULL){
nextPtr = linkPtr->next;
}
delete linkPtr;
linkPtr = nextPtr;
}
//Creation of List
void SimpleVector::linkList(int size){    
Link *newLink = new Link; //create first link
head = newLink; //
head->data = size--;         //Fill the front with data
head->next = NULL;     //Point the front to no where
do{
Link *end = new Link;   //Create a new link
end->data = size--;     //Fill with data
end->next = NULL;       //Point to no where
head->next = end;       //Previous link will point to the end
// head = end;             //Move to the end
}while(size > 0);          //Repeat until filled
}
//Creation of Link and insertion
/*
template <class T>
void SimpleVector<T>::insertLink(T){
}
*/
//Function to print the entire list
void SimpleVector::displayList(){
Link *linkPtr;
linkPtr = head;
while(linkPtr != NULL){
cout<<setprecision(3)<<linkPtr->data;
linkPtr = linkPtr->next;
}
}
#endif

主.cpp

// This program demonstrates the SimpleVector template.
#include <iostream>
#include "SimpleVector.h"
using namespace std;

int main(){
int SIZE = 10; // Number of elements
// Create a SimpleVector of ints.
SimpleVector intTable;
intTable.linkList(SIZE);
intTable.displayList();
return 0;
}

你在linkList()函数中做错了。 这条线head->next = end;

假设第一个节点包含 10 个，然后结束包含 9(新节点)
现在head->next = end

意味着10 -> 9

现在新节点end变为 8

再次head->next = end意味着10 -> 8前 9 个丢失。 . . .

最后，它将变得10 -> 1

试试这个。

void SimpleVector::linkList(int size){    
Link *newLink = new Link; //create first link
head = newLink; //
head->data = size--;         //Fill the front with data
head->next = NULL;     //Point the front to no where
Link *temp = head;
do{
Link *end = new Link;   //Create a new link
end->data = size--;     //Fill with data
end->next = NULL;       //Point to no where
temp->next=end;//Previous link will point to the end
temp=end;  //Now this has become previous link     
// head = end;             //Move to the end
}while(size > 0);          //Repeat until filled
}

它使用temp变量指向上一个节点，然后在上一个节点和end节点(新创建的节点)之间创建链接，然后 temp 变为 end。

编辑：

Link *linkPtr=head;
Link *nextPtr;// = linkPtr->next;
do
{
nextPtr = linkPtr->next;
cout<<linkPtr->data<<"t";
delete linkPtr;
linkPtr = nextPtr;
}while(linkPtr!=NULL);

试试这个。它删除整个列表

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