qt写一个计算器的代码

当然可以！以下是一个使用Qt编写的简单计算器的示例代码：

#include <QApplication>
#include <QGridLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QWidget>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QWidget window;
    window.setWindowTitle("计算器");

    QGridLayout *layout = new QGridLayout(&window);

    QLineEdit *display = new QLineEdit();
    display->setReadOnly(true);
    layout->addWidget(display, 0, 0, 1, 4);

    QPushButton *buttons[10];
    for (int i = 0; i < 10; ++i) {
        buttons[i] = new QPushButton(QString::number(i));
    }

    layout->addWidget(buttons[7], 1, 0);
    layout->addWidget(buttons[8], 1, 1);
    layout->addWidget(buttons[9], 1, 2);
    layout->addWidget(buttons[4], 2, 0);
    layout->addWidget(buttons[5], 2, 1);
    layout->addWidget(buttons[6], 2, 2);
    layout->addWidget(buttons[1], 3, 0);
    layout->addWidget(buttons[2], 3, 1);
    layout->addWidget(buttons[3], 3, 2);
    layout->addWidget(buttons[0], 4, 0, 1, 3);

    QPushButton *addButton = new QPushButton("+");＊＊＊