在使用Qt5时遇到找不到QApplication等库文件的问题，原因是这些库已迁移至其他位置。文章提供了解决方案，包括更新头文件包含路径、修改profile以适应Qt4风格，以及详细说明了Qt应用在编程中的作用。
In QT5, when I use this: #include<QApplication>, QT tells :no such file or directory, even though it is all right for previous version of QT.
It turns out these files QApplication and so on have been moved to other places.
How to correct?
#include <QApplication> --------------------> #include <QWidgets/QApplication>
#include <QDialog> --------------------> #include <QWidgets/QDialog>
#include <QLabel> --------------------> #include <QWidgets/QLabel>
.....................blabla
when I do this, still there are some errors, I dunno...........
another way is to change the .pro file, make it adapt to qt4.
In QT gui, the application is necessary for a program, it is used for managing the program application resources.
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