QT5-控件-QSpinBox和QDoubleSpinBox（用于通过控件调整整数和小数）

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSpinBox>
#include <QDoubleSpinBox>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

    QSpinBox* spin[10];
    QDoubleSpinBox* doublespin[10];
};

#endif // MAINWINDOW_H

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    this->resize(400,300);
    this->centralWidget();

    int xpos = 10 ;
    int ypos = 30 ;

    int val[] = {50,100,200};
    double double_val[] = {50.5,127.32,171.342};

    for(int i=0;i<3;i++)
    {
        spin[i] = new QSpinBox(this);
        spin[i]->setMinimum(10);
        spin[i]->setMaximum(300);
        spin[i]->setValue(val[i]);
        spin[i]->setGeometry(xpos,ypos,100,30);
        spin[i]->setPrefix("$ ");

        doublespin[i] = new QDoubleSpinBox(this);
        doublespin[i]->setMinimum(10.0);
        doublespin[i]->setMaximum(300.0);
        doublespin[i]->setValue(double_val[i]);
        doublespin[i]->setGeometry(xpos+110,ypos,100,30);
        doublespin[i]->setSuffix(" mm");

        ypos += 40 ;
    }
}

MainWindow::~MainWindow()
{

}

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}