how to use "or"

Can u pls tell me what is wrong ( just an example) How do i use the or command ?

   for i = 1:100
    if i == 2|5
    disp('hallo')
    end
    end

Answer 1

[the cyclist]

for i = 1:100
  if (i == 2)|(i == 5)
    disp('hallo')
  end
end

Answer 2

[Andrei Bobrov]

for ii = 1:100
    if ii == 2 || ii == 5
        ii
        disp('hallo')
    end
end

or

for ii = 1:100
    if ismember(ii,[2,5])
        disp('hallo'),ii
    end
end