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a month ago
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function [perimeter, area] = myFunction(D)
perimeter=pi*D;
area=pi*D^2/4;

if D<0
    disp('ERRORE!!la soluzione è zero')
    perimeter=0;
    area=0;
else
    perimeter=pi*D;
    area=pi*D^2/4;
end
end
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