When I press ok button it automatically goes to command window.

% --- Executes on button press in ok.
function ok_Callback(hObject, eventdata, handles)
% hObject    handle to ok (see GCBO)
set(handles.text11,'String','');
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
str=get(handles.inputastext,'String');
money=str2num(str);
str=get(handles.text11,'String');
c = get(handles.buttongroup,'SelectedObject');
sosSelection = get(c,'String');
switch sosSelection
    case 'Espresso'
        handles.espressoPrice = 2.00;
        while money<handles.espressoPrice %to calculate price of espresso
            change_e=handles.espressoPrice-money
            ve=(strcat(str,(['You need add (',num2str(change_e),' euros): '])));
            set(handles.text11,'String',ve);
            money=money+input(ve);
            if money==handles.espressoPrice
                de=(strcat(str,(['Enjoy your coffee'])));
                set(handles.text11,'String',de);
            else money>handles.espressoPrice
                left_e=money-handles.espressoPrice
                re=(strcat(str,(['Here your (',num2str(left_e),' euros). ENJOY YOUR COFFEE'])))
                set(handles.inputastext,'String','');
            end
        end

I want to do anything that the program will continue in GUIDE not command window.

Answer 1

[Voss]

Control switches to the command line because of your use of the input function here:

money=money+input(ve);

If you use inputdlg instead, then a dialog box will appear where the user can input the required information, rather than entering it on the command line.

https://www.mathworks.com/help/matlab/ref/inputdlg.html

[Ali]

Operator '+' is not supported for operands of type 'cell'.

It gave this error

[Voss]

The inputdlg documentation page I shared tells you what inputdlg outputs (it's a cell array).

Here's the relevant section:

https://www.mathworks.com/help/matlab/ref/inputdlg.html#d124e775647

Here's an outline of how you might use it (realize that any time your program is taking user input, whether through input or inputdlg or otherwise, you'll need some logic that makes sure they gave you something you can use; without such logic your program is prone to errors and/or unexpected behavior):

result = inputdlg('Give me more money!')

if isempty(result) % user clicked Cancel or closed the dialog box without clicking OK
    
    % you figure out what you want to do in this case
    
else
    
    % convert the user-entered character vector to a number:
    result = str2double(result{1});
    
    if isnan(result) % user entered something that could not be converted to a scalar number,
                     % e.g. '2 3' or 'baba' or '' (empty character vector - user didn't enter anything), etc.
        
        % you figure out what you want to do in this case
        
    else
        
        % user entered a good value (scalar number) you can use -> use it
        money = money + result;
        
    end
    
end