为什么我的代码块上没有显示输出？

Question

我正在尝试在 code::blocks 17.12 上实现一个链表（在节点的末尾），但没有显示任何输出。此代码向我显示黑色输出屏幕，我的日志中包含以下消息：

-------------- Build: Debug in Delete duplicate-value in Linked List (compiler: GNU GCC Compiler)---------------

mingw32-g++.exe -Wall -fexceptions -g -c "C:\Users\hp\Desktop\CPP Programming\Delete duplicate-value in Linked List\main.cpp" -o obj\Debug\main.o mingw32-g++.exe -o "bin\Debug\Delete duplicate-value in Linked List.exe" obj\Debug\main.o
Output file is bin\Debug\Delete duplicate-value in Linked List.exe with size 1.51 MB Process terminated with status 0 (0 minute(s), 1 second(s)) 0 error(s), 0 warning(s) (0 minute(s), 1 second(s))

-------------- Run: Debug in Delete duplicate-value in Linked List (compiler: GNU GCC Compiler)---------------

Checking for existence: C:\Users\hp\Desktop\CPP Programming\Delete duplicate-value in Linked List\bin\Debug\Delete duplicate-value in Linked List.exe Executing: "C:\Program Files (x86)\CodeBlocks/cb_console_runner.exe" "C:\Users\hp\Desktop\CPP Programming\Delete duplicate-value in Linked List\bin\Debug\Delete duplicate-value in Linked List.exe" (in C:\Users\hp\Desktop\CPP Programming\Delete duplicate-value in Linked List.) Process terminated with status -1073741510 (0 minute(s), 10 second(s))

#include <iostream>
#include<stdlib.h>
#include<bits/stdc++.h>
#include<conio.h>

using namespace std;

struct Node
{
    int data;
    Node *next;
};
void pushinorder(struct Node** head, int new_data)
{
    struct Node* new_node = (struct Node*)malloc(sizeof(struct Node));
    struct Node *temp = *head;
    new_node->data = new_data;
    new_node->next = NULL;
    if(*head==NULL)
    {
        *head = new_node;
        return;
    }
    while(temp->next!=NULL)
    {
        temp = temp->next;
    }
    temp->next = new_node;
    return;
}

void PrintList(struct Node* head)
{
    struct Node *temp = head;
    while(temp!=NULL)
    {
        cout<<temp->data<<" ";
        temp=temp->next;
    }

}

int main()
{
struct Node *head = (struct Node*)malloc(sizeof(struct Node));

pushinorder(&head,1);
pushinorder(&head,1);
pushinorder(&head,1);
pushinorder(&head,2);
pushinorder(&head,2);
pushinorder(&head,3);
pushinorder(&head,3);
pushinorder(&head,3);
pushinorder(&head,3);
pushinorder(&head,4);
PrintList(head);
getch();
return 0;

Answer 1

问题好像是这个：

struct Node *head = (struct Node*)malloc(sizeof(struct Node));

在 pushinorder 函数中，这意味着 *head 将不是是空指针，而且 *head 的成员 (因此 temp) 将具有 indeterminate （并且看似随机或垃圾）值。使用 *head 的未初始化成员将导致 undefined behavior.

简单的解决方案是将 head 初始化为空指针：

Node *head = nullptr;

Answer 2

您的代码可能已挂起，-1073741510 或 0xc000013a 的 return 代码表示您已按 ctrl-c 终止应用程序。

head->next 未初始化。您应该使用 new 而不是 malloc 并向 Node 添加一个构造函数，它将 next 初始化为 null:

struct Node
{
    int data;
    Node *next;
    Node(): next(nullptr) {}
};

为什么我的代码块上没有显示输出？

Why there is no output showing on my codeblocks?

c

c++

codeblocks

data-structures

singly-linked-list