File list (Check if you may need any files):
qtcalculator\calculator.cpp
............\calculator.h
............\calculator.pro
............\calculator.pro.user
............\calculator.ui
............\images\button-.png
............\......\button-blue.png
............\......\button-green.png
............\......\button-purple.png
............\......\button-red.png
............\......\display.png
............\......\star.png
............\images.qrc
............\main.cpp
............\images
qtcalculator