% Feil i opprinnelig kode:
%   1. for 1:2:n --> for 1:2:n-1 (off-by one)
%   2. mangler midlertidig variabel temp for mellomlagring 

function A = bytt2(A)
    n = length(A);

    for i = 1:2:n-1        % feil 1 %
        temp = A(i);       % feil 2 %
        A(i) = A(i+1);
        A(i+1) = temp;
    end
end