function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
a = str2double(get(handles.editA,'String'));
b = str2double(get(handles.editB,'String'));
c = str2double(get(handles.editC,'String'));
d = str2double(get(handles.editD,'String'));

x = roots([a b c d]);
S = sprintf('X1 = %s\nX2 = %s\nX3 = %s', num2str(x(1)), num2str(x(2)), num2str(x(3)));
set(handles.textSolve,'String',S);