MainWindow 0 0 414 479 Calculator_v6_4490 Qt::ToolButtonTextOnly ^ 7 9 ( 1 ClearLine QFrame::StyledPanel true 2 8 - 4 6 / + ) * 5 . 3 Back 0 c s = Ans *10^ 0 0 414 30 Menu Constant Paste (V) Ctrl+V Clear Buffer(U) Ctrl+U c pi Show History(H) Ctrl+H