QT-常见的函数

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QDebug>

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

    //Qt中常见的一些算法接口
    double x = - 98.45, y = 25.69;
    //1：qAbs() 求一个double型数的绝对值
    double result1 = qAbs(x);
    qDebug()<<" qabs result: " <<result1;

    //2:qMax(,) q求两个数中较大的那个
    double max_num = qMax(x, y);
    qDebug()<<"qmax result: "<< max_num;

    //3：qRound 求double的四舍五入的值
    int result2 = qRound(x);
    int result3 = qRound(y);
    qDebug()<< "四舍五入的值 result x :" << result2 <<" result y "<<result3;

    //4: qSwap 交换两个数
    qSwap(x,y);
    qDebug() <<"交换x,y x = " << x << " y = "<<  y;
    
    
}

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