A friend asked me to download his calculator program. I told him there was already a calculator program that came with Windows, and he said he didn't care, his was better. So I downloaded it, and I clicked "2+2". And it came back "22".
I told him his program had a problem with addition. He checked the code and he got back to me and said "Oh, no, the library I linked in for mathematical operations handles addition that way. It's a completely legitimate and valid result."
I tried to impress upon him that 2+2 did not, in fact, equal 22, that it equalled 4, but he was not having it. "Who am I to second-guess the person who made those libraries? I mean, sure, I could easily fix the code for the addition function, but who knows what else it might break?"
He also pointed out that if you typed in "0+1" it would return "1", which _is_ in fact what "0+1" is, so obviously there was nothing at all wrong with his program.
Later I found out his program gave me a virus and I had to reformat my hard drive.
