Matlab Graphical User Interface (GUI) - Simple Calculator - Diamond Matlab Tutorials

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help plz : Cannot find an exact (case-sensitive) match for 'String' The closest match is: string in C:\Program Files\MATLAB\R2016b\toolbox\matlab\strfun\@string\string.m Error in Simple>Calculer_Callback (line 157) set(handles.C,String,num2str(C)); Error in gui_mainfcn (line 95) feval(varargin{:}); Error in Simple (line 42) gui_mainfcn(gui_State, varargin{:}); Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Simple('Calculer_Callback',hObject,eventdata,guidata(hObject)) Error while evaluating UIControl Callback