多重循环编码规

 1 QT       += core gui
 2 
 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 4 
 5 TARGET = TestTime
 6 TEMPLATE = app
 7 
 8 
 9 SOURCES += main.cpp10         mainwindow.cpp
11 
12 HEADERS  += mainwindow.h
13 
14 FORMS    += mainwindow.ui

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 
 6 namespace Ui
 7 {
 8     class MainWindow;
 9 }
10 
11 class MainWindow : public QMainWindow
12 {
13     Q_OBJECT
14 
15 public:
16     explicit MainWindow(QWidget *parent = 0);
17     ~MainWindow();
18 
19     void Test();
20 
21 private:
22     void result();
23     void doSomething();
24     void TestMaxOuter();
25     void TestMaxInner();
26 
27 private:
28     Ui::MainWindow *ui;
29     int m_timeMaxOuter;
30     int m_timeMaxInner;
31 };
32 
33 #endif // MAINWINDOW_H

 1 #include "mainwindow.h"
 2 #include "ui_mainwindow.h"
 3 #include <QTime>
 4 #include <QDebug>
 5 
 6 #define CYCLE_TIMES1  (10)
 7 #define CYCLE_TIMES2  (100)
 8 #define CYCLE_TIMES3  (1000)
 9 
10 MainWindow::MainWindow(QWidget *parent)
11     : QMainWindow(parent),
12     ui(new Ui::MainWindow),
13     m_timeMaxOuter(0),
14     m_timeMaxInner(0)
15 {
16     ui->setupUi(this);
17 }
18 
19 MainWindow::~MainWindow()
20 {
21     delete ui;
22 }
23 
24 void MainWindow::Test()
25 {
26     TestMaxOuter();
27     TestMaxInner();
28     result();
29 }
30 
31 void MainWindow::doSomething()
32 {
33     for (int i = 0; i < CYCLE_TIMES2; ++i)
34     {
35         int *pTemp = new int;
36         *pTemp = i;
37         delete pTemp;
38     }
39 }
40 
41 void MainWindow::TestMaxOuter()
42 {
43     QTime timeTemp;
44     timeTemp.start();
45 
46     for (int i = 0; i < CYCLE_TIMES3; ++i)
47     {
48         for (int j = 0; j < CYCLE_TIMES2; ++j)
49         {
50             for (int m = 0; m < CYCLE_TIMES1; ++m)
51             {
52                 doSomething();
53             }
54         }
55     }
56 
57     m_timeMaxOuter = timeTemp.elapsed();
58     qDebug() << "TestMaxOuter cost time :: " << m_timeMaxOuter;
59 }
60 
61 void MainWindow::TestMaxInner()
62 {
63     QTime timeTemp;
64     timeTemp.start();
65 
66     for (int i = 0; i < CYCLE_TIMES1; ++i)
67     {
68         for (int j = 0; j < CYCLE_TIMES2; ++j)
69         {
70             for (int m = 0; m < CYCLE_TIMES3; ++m)
71             {
72                 doSomething();
73             }
74         }
75     }
76 
77     m_timeMaxInner = timeTemp.elapsed();
78     qDebug() << "TestMaxInner cost time :: " << m_timeMaxInner;
79 }
80 
81 void MainWindow::result()
82 {
83     if (m_timeMaxInner < m_timeMaxOuter)
84     {
85         qDebug() << "MaxInner more than faster :: " << m_timeMaxOuter - m_timeMaxInner;
86     }
87     else
88     {
89         qDebug() << "MaxOuter more than faster :: " << m_timeMaxInner - m_timeMaxOuter;
90     }
91 }

 1 #include "mainwindow.h"
 2 #include <QApplication>
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     QApplication a(argc, argv);
 7     MainWindow w;
 8     w.Test();
 9     w.show();
10 
11     return a.exec();
12 }