C++ 图形界面开发

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QLineEdit>
#include <QComboBox>
#include <QPushButton>
#include <QLabel>
using namespace std;

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QWidget window;
    window.setWindowTitle("简易计算器");

    QVBoxLayout *mainLayout = new QVBoxLayout(&window);
    QHBoxLayout *inputLayout = new QHBoxLayout;

    QLineEdit *num1 = new QLineEdit;
    QLineEdit *num2 = new QLineEdit;
    QComboBox *op = new QComboBox;
    op->addItems({"+", "-", "*", "/"});
    QLabel *result = new QLabel("结果: ?");
    QPushButton *btn = new QPushButton("计算");

    inputLayout->addWidget(num1);
    inputLayout->addWidget(op);
    inputLayout->addWidget(num2);

    mainLayout->addLayout(inputLayout);
    mainLayout->addWidget(btn);
    mainLayout->addWidget(result);

    QObject::connect(btn, &QPushButton::clicked, [&]() {
        double a = num1->text().toDouble();
        double b = num2->text().toDouble();
        double r = 0;
        QString oper = op->currentText();
        if (oper == "+") r = a + b;
        else if (oper == "-") r = a - b;
        else if (oper == "*") r = a * b;
        else if (oper == "/") r = (b != 0) ? a / b : 0;
        result->setText("结果: " + QString::number(r));
    });

    window.show();
    return app.exec();
}

// 核心逻辑：生成随机数后，在按钮点击时读取输入框
// 比较并更新提示标签和计数
// 猜对后弹出 QMessageBox::information 恭喜

// 伪代码：
int secret = rand() % 100 + 1;
int count = 0;

// 按钮槽函数：
void onGuess() {
    int guess = input->text().toInt();
    count++;
    if (guess > secret) hint->setText("太大了！");
    else if (guess < secret) hint->setText("太小了！");
    else {
        hint->setText("猜对了！");
        QMessageBox::information(this, "恭喜",
            "你猜了" + QString::number(count) + "次！");
    }
    countLabel->setText("次数: " + QString::number(count));
}

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QTimer>
#include <QMessageBox>
#include <QTime>

class Pomodoro : public QWidget {
    Q_OBJECT
public:
    Pomodoro(QWidget *parent = nullptr) : QWidget(parent), remaining(25 * 60) {
        QVBoxLayout *layout = new QVBoxLayout(this);
        timeLabel = new QLabel("25:00", this);
        timeLabel->setStyleSheet("font-size:48px; color:#333;");
        timeLabel->setAlignment(Qt::AlignCenter);

        QPushButton *startBtn = new QPushButton("开始", this);
        QPushButton *resetBtn = new QPushButton("重置", this);

        layout->addWidget(timeLabel);
        layout->addWidget(startBtn);
        layout->addWidget(resetBtn);

        timer = new QTimer(this);
        timer->setInterval(1000);
        connect(timer, &QTimer::timeout, this, &Pomodoro::updateTime);
        connect(startBtn, &QPushButton::clicked, [this, startBtn]() {
            if (timer->isActive()) { timer->stop(); startBtn->setText("继续"); }
            else { timer->start(); startBtn->setText("暂停"); }
        });
        connect(resetBtn, &QPushButton::clicked, [this, startBtn]() {
            timer->stop();
            remaining = 25 * 60;
            updateDisplay();
            startBtn->setText("开始");
        });
        updateDisplay();
    }

private slots:
    void updateTime() {
        if (--remaining <= 0) {
            timer->stop();
            QMessageBox::information(this, "时间到", "休息一下吧！");
        }
        updateDisplay();
    }
    void updateDisplay() {
        int m = remaining / 60, s = remaining % 60;
        timeLabel->setText(QString("%1:%2").arg(m, 2, 10, QChar('0')).arg(s, 2, 10, QChar('0')));
    }
private:
    QTimer *timer;
    QLabel *timeLabel;
    int remaining;
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    Pomodoro w;
    w.setWindowTitle("番茄钟");
    w.resize(300, 200);
    w.show();
    return app.exec();
}