链接列表中的指针地址未更改 [英] Pointer address does not change in a link list

问题描述

我的问题是q->next总是打印相同的地址，但是我分配了q = &x;.为什么它不打印其他地址?

My problem is q->next always prints the same address, but I assigned q = &x;. Why it is not printing different addresses?

#include <stdio.h>


class Node
{
public:
    int val;
    Node *next;
    Node(int v,Node *p) { val=v, next=p; }
};


int main()
{
    Node head(0, NULL);
    Node *q = &head;

    int i = 5;
    while (i>0)
    {
        Node x(i * 10, q);
        q = &x;
        printf("# %d %p\n", q->val, q->next);
        i--;
    }
}

推荐答案

这与x的分配方式有关:它是main函数内部的局部变量.这意味着它被分配在堆栈中的特定位置.您一直在重复使用同一块内存.相反，请尝试为新节点(new)分配内存.

This has to do with the way x is allocated: It is a local variable inside the main function. That means it is allocated on the stack, at a specific position. You are reusing the same piece of memory all the time. Instead, try allocating memory for new nodes (new).

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