2-2-5把书上的代码调通了

This commit is contained in:
iridiumR 2022-03-29 15:02:47 +08:00
parent 74e693590a
commit e8fa6e2d7b
5 changed files with 431 additions and 0 deletions

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QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
CONFIG += c++17
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

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#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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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>
static std::string displayTest;
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->lineEdit->setText("0");
result=0.0;
waitForOperand=true;
connectSlots();
}
MainWindow::~MainWindow()
{
delete ui;
}
//计算
bool MainWindow::calculate(double operand, QString pendingOperator)
{
if(pendingOperator == "+")
{
result += operand;
}
else if(pendingOperator == "-")
{
result -= operand;
}
else if(pendingOperator == "*")
{
result *= operand;
}
else if(pendingOperator == "/")
{
if(operand == 0.0)
return false;
result /= operand;
}
return true;
}
//错误处理
void MainWindow::abortOperation()
{
result = 0.0;
pendingOperator.clear();
ui->lineEdit->setText("0");
waitForOperand = true;
QMessageBox::warning(this, "运算错误", "除数不能为零");
}
//似乎是数字被点击
void MainWindow::digitClicked()
{
QPushButton *digitBtn = static_cast<QPushButton*>(sender());
QString value = digitBtn->text();
// if(ui->lineEdit->text() == "0" && value == "0")
// return;
if(waitForOperand)
{
ui->lineEdit->setText(value);
waitForOperand = false;
}
else
{
ui->lineEdit->setText(ui->lineEdit->text() + value);
}
}
void MainWindow::on_clearBtn_clicked()
{
//将当前显示的数归零
ui->lineEdit->setText("0");
waitForOperand = true;
}
void MainWindow::on_clearAllBtn_clicked()
{
//将当前显示的数据归零,并将之前保存的数据运算清除
ui->lineEdit->setText("0");
waitForOperand = true;
result = 0.0;
pendingOperator.clear();
}
void MainWindow::on_equalBtn_clicked()
{
double operand = ui->lineEdit->text().toDouble();
if(pendingOperator.isEmpty())
return;
if(!calculate(operand, pendingOperator))
{
abortOperation();
return;
}
ui->lineEdit->setText(QString::number(result));
pendingOperator.clear();
result = 0.0;
waitForOperand = true;
}
void MainWindow::on_signBtn_clicked()
{
QString text = ui->lineEdit->text();
double value = text.toDouble();
if(value > 0)
{
text.prepend('-');
}
else if(value < 0)
{
text.remove(0, 1);
}
ui->lineEdit->setText(text);
}
void MainWindow::operatorClicked()
{
QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender());
QString clickedOperator = clickedBtn->text();
double operand = ui->lineEdit->text().toDouble();
if(!pendingOperator.isEmpty())
{
if(!calculate(operand, pendingOperator))
{
abortOperation();
return;
}
ui->lineEdit->setText(QString::number(result));
}
else
{
result = operand;
}
pendingOperator = clickedOperator;
waitForOperand = true;
}
void MainWindow::on_pointBtn_clicked()
{
if (waitForOperand)
ui->lineEdit->setText("0");
if (!ui->lineEdit->text().contains('.'))
ui->lineEdit->setText(ui->lineEdit->text() + ".");
waitForOperand = false;
}
void MainWindow::connectSlots()
{
QPushButton *digitBtns[10] = {
ui->digitBtn0, ui->digitBtn1, ui->digitBtn2, ui->digitBtn3,
ui->digitBtn4, ui->digitBtn5, ui->digitBtn6, ui->digitBtn7,
ui->digitBtn8, ui->digitBtn9
};
for (auto btn : digitBtns)
connect(btn, &QPushButton::clicked, this, &MainWindow::digitClicked);
QPushButton *operatorBtns[4] = {
ui->addBtn, ui->subtractionBtn, ui->mulBtn, ui->divisionBtn,
};
for (auto btn : operatorBtns)
connect(btn, &QPushButton::clicked, this, &MainWindow::operatorClicked);
}

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
bool calculate(double operand, QString pendingOperator);
//终止运算,清除数据,报错
void abortOperation();
//连接信号和槽
void connectSlots();
//储存运算符
QString pendingOperator;
//储存运算结果
double result;
//标记是否等待一个操作数
bool waitForOperand;
private slots:
void on_clearBtn_clicked();
void on_clearAllBtn_clicked();
void on_equalBtn_clicked();
void digitClicked();
void on_signBtn_clicked();
void operatorClicked();
void on_pointBtn_clicked();
};
#endif // MAINWINDOW_H

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<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>405</width>
<height>320</height>
</rect>
</property>
<property name="windowTitle">
<string>Calculator_v2_4490</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout">
<item row="3" column="1">
<widget class="QPushButton" name="digitBtn5">
<property name="text">
<string>5</string>
</property>
</widget>
</item>
<item row="5" column="3">
<widget class="QPushButton" name="divisionBtn">
<property name="text">
<string>/</string>
</property>
</widget>
</item>
<item row="2" column="2">
<widget class="QPushButton" name="digitBtn3">
<property name="text">
<string>3</string>
</property>
</widget>
</item>
<item row="3" column="0">
<widget class="QPushButton" name="digitBtn4">
<property name="text">
<string>4</string>
</property>
</widget>
</item>
<item row="4" column="3">
<widget class="QPushButton" name="mulBtn">
<property name="text">
<string>*</string>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QPushButton" name="digitBtn2">
<property name="text">
<string>2</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QPushButton" name="clearBtn">
<property name="text">
<string>Clear</string>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QPushButton" name="clearAllBtn">
<property name="text">
<string>ClearAll</string>
</property>
</widget>
</item>
<item row="5" column="0">
<widget class="QPushButton" name="pointBtn">
<property name="text">
<string>.</string>
</property>
</widget>
</item>
<item row="5" column="1">
<widget class="QPushButton" name="digitBtn0">
<property name="text">
<string>0</string>
</property>
</widget>
</item>
<item row="1" column="2" colspan="2">
<widget class="QPushButton" name="equalBtn">
<property name="text">
<string>=</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QPushButton" name="digitBtn1">
<property name="text">
<string>1</string>
</property>
</widget>
</item>
<item row="3" column="2">
<widget class="QPushButton" name="digitBtn6">
<property name="text">
<string>6</string>
</property>
</widget>
</item>
<item row="3" column="3">
<widget class="QPushButton" name="subtractionBtn">
<property name="text">
<string>-</string>
</property>
</widget>
</item>
<item row="4" column="0">
<widget class="QPushButton" name="digitBtn7">
<property name="text">
<string>7</string>
</property>
</widget>
</item>
<item row="0" column="0" colspan="4">
<widget class="QLineEdit" name="lineEdit">
<property name="alignment">
<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
</property>
<property name="readOnly">
<bool>true</bool>
</property>
</widget>
</item>
<item row="4" column="1">
<widget class="QPushButton" name="digitBtn8">
<property name="text">
<string>8</string>
</property>
</widget>
</item>
<item row="4" column="2">
<widget class="QPushButton" name="digitBtn9">
<property name="text">
<string>9</string>
</property>
</widget>
</item>
<item row="2" column="3">
<widget class="QPushButton" name="addBtn">
<property name="text">
<string>+</string>
</property>
</widget>
</item>
<item row="5" column="2">
<widget class="QPushButton" name="signBtn">
<property name="text">
<string>+/-</string>
</property>
</widget>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>405</width>
<height>30</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>