使用Qt制作一个简易计算器

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最新推荐文章于 2025-04-11 12:36:32 发布

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分类专栏： Qt 文章标签： qt C++ 计算器

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基于Qt，使用C++语言开发的一个简易计算器，包含了加减乘除四则运算。（仅适合初级学者学习）

widget.h 文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

private slots:
    void on_okButton_clicked();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

widget.cpp 文件

#include "widget.h"
#include "ui_widget.h"

#include <QDebug>
#include <QMessageBox>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_okButton_clicked()
{
/*
 * 只有加法运算
 * * * * * * * */
//    int firstNumber =  ui->firstNumberLineEdit->text().toInt();
//    int secondNumber = ui->secondNumberLineEdit->text().toInt();
//    int resultNumber = firstNumber + secondNumber;

//    ui->resultLineEdit->setText(QString::number(resultNumber));

/*
 * 加减乘除四则运算
 * * * * * * * * * * */
    int firstNumber =  ui->firstNumberLineEdit->text().toInt();
    int secondNumber = ui->secondNumberLineEdit->text().toInt();
    int resultNumber;

    if(ui->operationComboBox->currentIndex() == 0)
    {
        resultNumber = firstNumber + secondNumber;
        ui->resultLineEdit->setText(QString::number(resultNumber));
        QMessageBox::information(this,"Result",QString::number(resultNumber));
    }

    if(ui->operationComboBox->currentIndex() == 1)
    {
        resultNumber = firstNumber - secondNumber;
        ui->resultLineEdit->setText(QString::number(resultNumber));
        QMessageBox::information(this,"Result",QString::number(resultNumber));
    }

    if(ui->operationComboBox->currentIndex() == 2)
    {
        resultNumber = firstNumber * secondNumber;
        ui->resultLineEdit->setText(QString::number(resultNumber));
        QMessageBox::information(this,"Result",QString::number(resultNumber));
    }

    if(ui->operationComboBox->currentIndex() == 3)
    {
        if(secondNumber == 0)
        {
//            qDebug("分子不能为零！");
            QMessageBox::warning(this,"Error Message","Scond number can't be zero!");
        }else
        {
            resultNumber = firstNumber / secondNumber;
            ui->resultLineEdit->setText(QString::number(resultNumber));
            QMessageBox::information(this,"Result",QString::number(resultNumber));
        }
    }
}