Write a function that creates a simple calculator with a GUI. The GUI should have two editable text boxes in which the user enters numbers. There should be four pushbuttons to show the four operations (+, -, *, /)

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guiCalculator.m

function guiCalculator

% Format of call: guiCalculator

f = figure('Visible','off','color','white',...

 'Position',[360 500 300 300]);

hop = uicontrol('Style','text','BackgroundColor','White',...

 'Position',[120 150 40 40]);

hequals = uicontrol('Style','text','BackgroundColor', 'White',...

 'Position',[200 150 40 40],'String','=','Visible','Off');

hresult = uicontrol('Style','text','BackgroundColor','White',...

 'Position',[240 150 40 40],'Visible','Off');

hfirst = uicontrol('Style','Edit','Position',[80 170 40 40]);

hsecond = uicontrol('Style','Edit','Position',[160 170 40 40]);

hadd = uicontrol('Style','pushbutton','Position',[45 50 50 50],...

 'String', '+','CallBack',@callbackfn);

hsub = uicontrol('Style','pushbutton','Position',[100 50 50 50],...

 'String', '-','CallBack',@callbackfn);

hmul = uicontrol('Style','pushbutton','Position',[155 50 50 50],...

 'String', '*','CallBack',@callbackfn);

hdiv = uicontrol('Style','pushbutton','Position',[210 50 50 50],...

 'String', '/','CallBack',@callbackfn);

hzero= uicontrol('Style','text','Position',[60 115 150 25],...

 'BackgroundColor','White','String',...

 'Cannot Divide by Zero','Visible','off');

set([hop hequals hresult hfirst hsecond hadd hsub hmul hdiv],...

 'Units','Normalized')

set(f,'Visible','On')

 function callbackfn(source,eventdata)

 firstnum = str2num(get(hfirst,'String'));

 secondnum = str2num(get(hsecond,'String'));

 set(hequals,'Visible','On')

 set(hzero,'Visible','off')

 switch source

 case hadd

 result = firstnum+secondnum;

 set(hop,'String','+')

 set(hresult,'String',num2str(result),'Visible','On')

 case hsub

 result = firstnum-secondnum;

 set(hop,'String','-')

 set(hresult,'String',num2str(result),'Visible','On')

 case hmul

 result = firstnum*secondnum;

 set(hop,'String','*')

 set(hresult,'String',num2str(result),'Visible','On')

 case hdiv

 if(secondnum == 0)

 set(hzero,'Visible','on')

 else

 result = firstnum/secondnum;

 set(hop,'String','+')

 set(hresult,'String',num2str(result),...

 'Visible','On')

 end

 end

 end

end

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