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function [grade] =  num2grade(points)
	if round(points) ~= points
    	error('points er ikke et heltall!')
	elseif points > 100 || points < 0
    	error('points må ligge i intervallet [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