QT collected a large number of examples of code, run individual tests may be normal

qtbook-examples
...............\examples
...............\........\chap01
...............\........\......\age
...............\........\......\...\age.cpp
...............\........\......\...\age.pro
...............\........\......\hello
...............\........\......\.....\hello.cpp
...............\........\......\.....\hello.pro
...............\........\......\quit
...............\........\......\....\quit.cpp
...............\........\......\....\quit.pro
...............\........\chap02
...............\........\......\find
...............\........\......\....\find.pro
...............\........\......\....\finddialog.cpp
...............\........\......\....\finddialog.h
...............\........\......\....\main.cpp
...............\........\......\gotocell
...............\........\......\........\gotocell.pro
...............\........\......\........\gotocelldialog.ui
...............\........\......\........\gotocelldialog.ui.h
...............\........\......\........\main.cpp
...............\........\......\sort
...............\........\......\....\main.cpp
...............\........\......\....\sort.pro
...............\........\......\....\sortdialog.ui
...............\........\......\....\sortdialog.ui.h
...............\........\chap03
...............\........\......\spreadsheet
...............\........\......\...........\cell.cpp
...............\........\......\...........\cell.h
...............\........\......\...........\finddialog.cpp
...............\........\......\...........\finddialog.h
...............\........\......\...........\gotocelldialog.ui
...............\........\......\...........\gotocelldialog.ui.h
...............\........\......\...........\images
...............\........\......\...........\......\copy.png
...............\........\......\...........\......\cut.png
...............\........\......\...........\......\delete.png
...............\........\......\...........\......\find.png
...............\........\......\...........\......\gotocell.png
...............\........\......\...........\......\icon.png
...............\........\......\...........\......\new.png
...............\........\......\...........\......\open.png
...............\........\......\...........\......\paste.png
...............\........\......\...........\......\save.png
...............\........\......\...........\main.cpp
...............\........\......\...........\mainwindow.cpp
...............\........\......\...........\mainwindow.h
...............\........\......\...........\sortdialog.ui
...............\........\......\...........\sortdialog.ui.h
...............\........\......\...........\spreadsheet.cpp
...............\........\......\...........\spreadsheet.h
...............\........\......\...........\spreadsheet.pro
...............\........\chap04
...............\........\......\spreadsheet
...............\........\......\...........\cell.cpp
...............\........\......\...........\cell.h
...............\........\......\...........\finddialog.cpp
...............\........\......\...........\finddialog.h
...............\........\......\...........\gotocelldialog.ui
...............\........\......\...........\gotocelldialog.ui.h
...............\........\......\...........\images
...............\........\......\...........\......\copy.png
...............\........\......\...........\......\cut.png
...............\........\......\...........\......\delete.png
...............\........\......\...........\......\find.png
...............\........\......\...........\......\gotocell.png
...............\........\......\...........\......\icon.png
...............\........\......\...........\......\new.png
...............\........\......\...........\......\open.png
...............\........\......\...........\......\paste.png
...............\........\......\...........\......\save.png
...............\........\......\...........\main.cpp
...............\........\......\...........\mainwindow.cpp
...............\........\......\...........\mainwindow.h
...............\........\......\...........\sortdialog.ui
...............\........\..

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