Qt实现计算器

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mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();private slots:    int on_resultButton_clicked();private:    Ui::MainWindow *ui;};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include<QMessageBox>#include<QString>MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);}MainWindow::~MainWindow(){    delete ui;}int MainWindow::on_resultButton_clicked(){    double first=ui->firstInput->text().toDouble();    double second=ui->secondInput->text().toDouble();    double result;    if(ui->comboBox->currentText()=="+")    {        result=first+second;    }    else if(ui->comboBox->currentText()=="-")    {        result=first-second;    }    else if(ui->comboBox->currentText()=="*")    {        result=first*second;    }    else if(ui->comboBox->currentText()=="/")    {        if(second==0)        {            QMessageBox::information(this,"Error","the second can not be 0");            return 0;        }        else        {            result=first/second;        }    }    QString string;    ui->resultLabel->setText(string.setNum(result));    return 0;}

main.cpp

#include "mainwindow.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow w;    w.show();    return a.exec();}

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