#include "widget.h"
#include <QApplication>
//QApplication应用程序类
//Qt头文件没有.h
//头文件和类名一样
int main(int argc, char *argv[])
{
    //有且只有一个应用程序类对象
    QApplication a(argc, argv);
    //MyWidget继承Qwidget，QWidget是一个窗口类对象
    //w是窗口
    Widget w;
    //窗口创建默认是隐藏的，需要认为显示
    w.show();
    //让程序一直执行，等待人为操作（等待事件的发生）
    return a.exec();//a是应用程序对象
}

#-------------------------------------------------
#
# Project created by QtCreator 2019-06-28T19:37:51
#
#-------------------------------------------------

#项目文件用“#”注释
#模块
QT       += core gui
#高于4版本添加QT+=widgets，为了兼容4
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
#应用程序的名字
TARGET = untitled5
#指定makefile的类型，app/lib（库）
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as 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 you use 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

CONFIG += c++11
#源文件.cpp
SOURCES += \
        main.cpp \
        widget.cpp
#头文件.h
HEADERS += \
        widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class Widget : public QWidget
{
    Q_OBJECT//信号与槽需要

public:
    Widget(QWidget *parent = 0);
    ~Widget();
};

#endif // WIDGET_H

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
}

Widget::~Widget()
{

}