In the QT environment to write a can achieve mathematical addition and circle area calculation

l\HelloQt4
l\HelloQt4.pro
l\HelloQt4.pro.user
l\HelloQt4.pro.user.1.3
l\main.cpp
l\main.o
l\Makefile
l\moc_widget.cpp
l\moc_widget.o
l\ui_widget.h
l\widget.cpp
l\widget.h
l\widget.o
l\widget.ui
l

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