Write a program to calculate the area of ​ ​ a circle qtcreator code click the label you can obtain the input values ​ ​ on the lineedit and calculations show that out of the entry level

andyyuanmayunamianji\andyyuanmayunamianji
....................\andyyuanmayunamianji.pro
....................\andyyuanmayunamianji.pro.user
....................\dialog.cpp
....................\dialog.h
....................\dialog.o
....................\main.cpp
....................\main.o
....................\Makefile
....................\moc_dialog.cpp
....................\moc_dialog.o
andyyuanmayunamianji

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