data from uitable GUI

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Hello everyone,

For give me for this question, i am a bit new at matlab

i have a code that uses a pushbutton to insert 2 values on a uitable, then, when i have the values on the table, i press another pushbutton to make some formula and then display it on another statictext, like shown bellow:

function testetabela_OpeningFcn(hObject, eventdata, handles, varargin) %%% Clear the table
dados=get(handles.uitable1,'Data');
dados(:,:) = [];
set(handles.uitable1,'Data',dados);
handles.output = hObject;
guidata(hObject, handles);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function pushbutton1_Callback(hObject, eventdata, handles) %%% MULTIPLY 2x Edittext and obtain c
a=str2double(get(handles.edit1,'String'));
b=str2double(get(handles.edit2,'String'));
c=a*b;
set(handles.edit3,'String',c);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function pushbutton2_Callback(hObject, eventdata, handles) %%% SET C value and B value ON THE TABLE
g=str2double(get(handles.edit2,'String'));
j=str2double(get(handles.edit3,'String'));
dados=get(handles.uitable1,'Data');
if isempty(dados)
    dados{1,1}=j;
    dados{1,2}=g;
else
    dados{end+1,1}=j;
    dados{end,2}=g;
end
set(handles.uitable1,'Data',dados)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function pushbutton3_Callback(hObject, eventdata, handles) %In this button i would like to get just the fields that have values on the table
                                                  %         and ignore the cells that have nothing.
%
dados=get(handles.uitable1,'Data');
da1=dados{1,1}; 
da2=dados{2,1};
da3=dados{3,1};
da4=dados{4,1};
da5=dados{5,1};
da6=dados{6,1};
az1=dados{1,2};
az2=dados{2,2};
az3=dados{3,2};
az4=dados{4,2};
az5=dados{5,2};
az6=dados{6,2};
A=da1+da2+da3+da4+da5+da6+az1+az2+az3+az4+az5+az6;
set(handles.text2,'String',A)