Not all of them.
Phil.
Teacher: Why are you late? Student: There was a man who lost a hundred dollar bill. Teacher: That's nice. Were you helping him look for it? Student: No. I was standing on it.
You're still thinking procedurally! A properly designed light bulb object would inherit a change method from a generic light bulb class!
Find out next time, on Dragonball Z!!!
Only one but it may take him/her more than five years to do it.
Seven - one to actually change the bulb and six to complain that they liked the old one better.
