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function resultatbool = helTall(N)
	resultatbool = (N == round(N));
end

b) 

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languagenone
function resultatbool = parTall(N)
	resultatbool = (helTall(N/2));
	% eller	resultatbool = (mod(N,2) == 0);
end


c)

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function resultatbool = positivtTall(N)
	resultatbool = (N >= 0);
end

d)

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	N = input('Oppgi et tall: ');

	if helTall(N)
    	disp('Tallet er et heltall');
		if parTall(N)
        	disp('Tallet er et partall');
		else
        	disp('Tallet er et oddetall');
    	end
	else
    	disp('Tallet er ikke et heltall');
	end
	if positivtTall(N)
    	disp('Tallet er positivt');
	else
    	disp('Tallet er negativt');
	end

...

Code Block
languagenone
function resultatbool = sammenlikne(A, B)
    resultatbool = (~(A > B) && ~(A < B));
end