因此,我正在计算leetcode的问题编号2(基本上,您在列表中将2个数字颠倒了,还需要对它们求和并在一个反向的列表中返回答案)。但是,我一直收到这个令人讨厌的错误:“运行时错误:类型'struct ListNode'的未对齐地址0x000000000031中的成员访问,这需要8个字节对齐”。我在机器上运行它,并且工作正常,给出了预期的结果。我的代码:
/*Definition of the list:
struct ListNode {
int val;
struct ListNode* next;
};*/
struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2) {
struct ListNode* answer = malloc(sizeof(struct ListNode));
answer->next = NULL;
answer->val = 0;
int auxInt = 0;
struct ListNode* auxVar = answer;
while(l1 != NULL || l2 != NULL) {
if(!l1) {
auxInt = answer->val;
answer->val = (auxInt + l2->val) % 10;
if(((l2->val + auxInt) / 10) != 0) {
answer->next = malloc(sizeof(struct …
Run Code Online (Sandbox Code Playgroud) 我正在尝试向 QML 中的 TableView 添加标题,但它没有按预期工作。这是示例代码:
主要.cpp:
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;
const QUrl url(QStringLiteral("qrc:/main.qml"));
QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
&app, [url](QObject *obj, const QUrl &objUrl) {
if (!obj && url == objUrl)
QCoreApplication::exit(-1);
}, Qt::QueuedConnection);
engine.load(url);
return app.exec();
}
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质量管理语言:
import QtQuick 2.12
import QtQuick.Window 2.12
import Qt.labs.qmlmodels 1.0
import QtQuick.Controls 2.15
Window {
width: 600
height: 600
visible: true
title: "Player"
TableView …
Run Code Online (Sandbox Code Playgroud) StatefulBuilder
我正在尝试在其小部件之外设置小部件状态。大多数示例和可用文档显示了setState
小部件内部使用的方法,但是我想知道是否可以从小部件外部调用此类方法StatefulBuilder
。这是一个例子:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'StackOverflow Example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'StackOverflow Example'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new GestureDetector(
//Change one of the icon's color using …
Run Code Online (Sandbox Code Playgroud) 我正在用 C 编写一个哈希游戏,我正在使用malloc
它为表分配内存。但是,当我编译程序时,出现分段错误。使用调试器我能够找到一个错误:显然,我不能使用 malloc,因为它找不到 malloc.c 或类似的东西。这是代码(发生段错误的地方):
int inicializaTabuleiro(char *ptrTabuleiro)
{
//Aloca memória para o tabuleiro
ptrTabuleiro = malloc(9);
//Verifica se a memória foi alocada
if(!ptrTabuleiro)
return 0;
int contadorPosicao;
//Preenche o tabuleiro com '-'
for(contadorPosicao = 0; contadorPosicao < 9; contadorPosicao++)
ptrTabuleiro[contadorPosicao] = '-';
return 1;
}
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关于可能导致它的任何想法?附加信息:在 Linux Mint 上使用带有 GCC 编译器的代码块。谢谢你的时间!
全部。我正在尝试将 a 添加ListView.builder
到 aColumn
内的 a 中SingleChildScrollView
。但是,我遇到了例外,可能是因为ListView.builder
. 这是我的代码:
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: …
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