使用Visual Studio 2022和Qt插件开发方式，实现了一个简单的计算器应用程序的具体代码

这里提供一个基于Visual Studio 2022和Qt插件开发的简单计算器应用程序的示例代码。

MainWindow.h头文件：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPushButton>
#include <QLineEdit>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

public slots:
    void onDigitClicked();
    void onOperatorClicked();
    void onEqualsClicked();
    void onClearClicked();

private:
    QPushButton* m_digits[10];
    QPushButton* m_operators[4];
    QPushButton* m_equals;
    QPushButton* m_clear;
    QLineEdit* m_display;

    QString m_currentValue;
    QString m_pendingValue;
    QString m_pendingOperator;
};
#endif // MAINWINDOW_H

MainWindow.cpp源文件：

#include "MainWindow.h"
#include <QGridLayout>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // 设置窗口标题
    setWindowTitle("Calculator");

    // 创建数字按钮
    for (int i = 0; i < 10; ++i)
    {
        m_digits[i] = new QPushButton(QString::number(i), this);
        connect(m_digits[i], SIGNAL(clicked()), this, SLOT(onDigitClicked()));
    }

    // 创建运算符按钮
    m_operators[0] = new QPushButton("+", this);
    m_operators[1] = new QPushButton("-", this);
    m_operators[2] = new QPushButton("*", this);
    m_operators[3] = new QPushButton("/", this);
    for (int i = 0; i < 4; ++i)
    {
        connect(m_operators[i], SIGNAL(clicked()), this, SLOT(onOperatorClicked()));
    }

    // 创建等于号、清除按钮和显示框
    m_equals = new QPushButton("=", this);
    m_clear = new QPushButton("C", this);
    m_display = new QLineEdit(this);

    // 创建布局
    QGridLayout* layout = new QGridLayout;
    layout->addWidget(m_display, 0, 0, 1, 4);
    layout->addWidget(m_clear, 1, 0);
    layout->addWidget(m_equals, 1, 1);
    layout->addWidget(m_operators[0], 1, 2);
    layout->addWidget(m_operators[1], 2, 2);
    layout->addWidget(m_operators[2], 3, 2);
    layout->addWidget(m_operators[3], 4, 2);
    for (int i = 1, row = 4, col = 0; i < 10; ++i)
    {
        if (col == 3)
        {
            ++row;
            col = 0;
        }
        else
        {
            ++col;
        }
        layout->addWidget(m_digits[i], row, col);
    }
    layout->addWidget(m_digits[0], 5, 0, 1, 2);

    // 设置窗口布局
    QWidget* centralWidget = new QWidget(this);
    centralWidget->setLayout(layout);
    setCentralWidget(centralWidget);

    // 初始化变量
    m_currentValue = "";
    m_pendingValue = "";
    m_pendingOperator = "";
}

MainWindow::~MainWindow()
{
}

void MainWindow::onDigitClicked()
{
    QPushButton* button = qobject_cast<QPushButton*>(sender());
    if (button)
    {
        m_currentValue += button->text();
        m_display->setText(m_currentValue);
    }
}

void MainWindow::onOperatorClicked()
{
    QPushButton* button = qobject_cast<QPushButton*>(sender());
    if (button)
    {
        // 如果存在待处理的值和运算符，先计算结果
        if (!m_pendingValue.isEmpty() && !m_pendingOperator.isEmpty())
        {
            double value = m_pendingValue.toDouble();
            double currentValue = m_currentValue.toDouble();
            if (m_pendingOperator == "+")
            {
                value += currentValue;
            }
            else if (m_pendingOperator == "-")
            {
                value -= currentValue;
            }
            else if (m_pendingOperator == "*")
            {
                value *= currentValue;
            }
            else if (m_pendingOperator == "/")
            {
                value /= currentValue;
            }
            m_pendingValue = QString::number(value);
            m_display->setText(m_pendingValue);
        }
        else
        {
            m_pendingValue = m_currentValue;
        }
        m_currentValue = "";
        m_pendingOperator = button->text();
    }
}

void MainWindow::onEqualsClicked()
{
    if (!m_pendingValue.isEmpty() && !m_pendingOperator.isEmpty())
    {
        double value = m_pendingValue.toDouble();
        double currentValue = m_currentValue.toDouble();
        if (m_pendingOperator == "+")
        {
            value += currentValue;
        }
        else if (m_pendingOperator == "-")
        {
            value -= currentValue;
        }
        else if (m_pendingOperator == "*")
        {
            value *= currentValue;
        }
        else if (m_pendingOperator == "/")
        {
            value /= currentValue;
        }
        m_pendingValue = "";
        m_pendingOperator = "";
        m_currentValue = QString::number(value);
        m_display->setText(m_currentValue);
    }
}

void MainWindow::onClearClicked()
{
    m_currentValue = "";
    m_pendingValue = "";
    m_pendingOperator = "";
    m_display->setText("");
}

这里的示例代码实现了一个简单的计算器应用程序，包括数字按钮、运算符按钮、等于号、清除按钮和显示框，同时利用了Qt的信号和槽机制，实现了计算器的基本功能。需要注意的是，在使用示例代码时，需要根据实际需要进行修改和适配。