qt用设计器实现简单四则运算计算器

////dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QString>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private slots:


    void on_pushButton_1_clicked();
    void on_pushButton_2_clicked();
    void on_pushButton_3_clicked();
    void on_pushButton_4_clicked();
    void on_pushButton_5_clicked();
    void on_pushButton_6_clicked();
    void on_pushButton_7_clicked();
    void on_pushButton_8_clicked();
    void on_pushButton_9_clicked();
    void on_pushButton_0_clicked();

    void on_pushButton_add_clicked();
    void on_pushButton_sub_clicked();
    void on_pushButton_mul_clicked();
    void on_pushButton_div_clicked();
    void on_pushButton_c_clicked();
    void on_pushButton_eq_clicked();

private:
    Ui::Dialog *ui;
    QString num1,num2,expression;
    bool op;
    char myoperator;

};

#endif // DIALOG_H
#ifndef DIALOG_H
#define DIAL