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function [grade]=  num2grade(points)
if round(points) ~= points
    error('points iser notikke anet integer.heltall!')
elseif points > 100 || points < 0
    error('points ismå notligge withini closedintervallet the intervall [0, 100].!')
elseif points > 88
    grade = 'A';
elseif points > 76
    grade = 'B';
elseif points > 64
    grade = 'C';
elseif points > 52
    grade = 'D';
elseif points > 40
    grade = 'E';
else
    grade = 'F';
end
end