QT实现二、八、十六进制之间的转换

//QString::number()和setNum()都可以转换
void MainWindow::on_btn1_clicked()
{//十进制转为其他进制
    QString str = ui->shi->text();
    int value = str.toInt();//十进制，toInt()默认是10进制数
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = str.setNum(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
 
    str = str.setNum(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn2_clicked()
{//二进制转为其他进制
    QString str = ui->er->text();//二进制
    bool ok;
    int value = str.toInt(&ok, 2);//以二进制数读入，读取成功ok=true;
    qDebug() << "ok=" << ok;
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = QString::number(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
 
    str = QString::number(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn3_clicked()
{//十六进制转为其他进制
    QString str = ui->shiliu->text();//十六进制
    bool ok;
    int value = str.toInt(&ok, 16);//以十六进制数读入
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = QString::number(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn4_clicked()
{//八进制转为其他进制
    QString str = ui->ba->text();//八进制
    bool ok;
    int value = str.toInt(&ok, 8);//以八进制数读入
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = QString::number(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
}

QT       += core gui
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
CONFIG += c++11
 
# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
 
# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#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

#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 slots:
 
    void on_btn1_clicked();
 
    void on_btn2_clicked();
 
    void on_btn3_clicked();
 
    void on_btn4_clicked();
 
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

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

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setWindowTitle("各种进制之间相互转换");
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
//QString::number()和setNum()都可以转换
void MainWindow::on_btn1_clicked()
{//十进制转为其他进制
    QString str = ui->shi->text();
    int value = str.toInt();//十进制，toInt()默认是10进制数
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = str.setNum(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
 
    str = str.setNum(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn2_clicked()
{//二进制转为其他进制
    QString str = ui->er->text();//二进制
    bool ok;
    int value = str.toInt(&ok, 2);//以二进制数读入，读取成功ok=true;
    qDebug() << "ok=" << ok;
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = QString::number(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
 
    str = QString::number(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn3_clicked()
{//十六进制转为其他进制
    QString str = ui->shiliu->text();//十六进制
    bool ok;
    int value = str.toInt(&ok, 16);//以十六进制数读入
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = QString::number(value,8);//转为八进制
    ui->ba->setText(str);
}
 
void MainWindow::on_btn4_clicked()
{//八进制转为其他进制
    QString str = ui->ba->text();//八进制
    bool ok;
    int value = str.toInt(&ok, 8);//以八进制数读入
 
    str = QString::number(value,10);//转为十进制
    ui->shi->setText(str);
 
    str = str.setNum(value,2);//转为二进制
    ui->er->setText(str);
 
    str = QString::number(value,16).toUpper();//转为十六进制
    ui->shiliu->setText(QString("0x%1").arg(str));
}