[Doctor Stochastic]

When I am wearing my computer scientist hat, 1 + 1 = 0 usually.

When I am wearing my numerical analyst hat, 1 + 1 generally bigger than 1 but smaller than 4; depending on the size of 1.

[dread78645]

For very large values of one place mark.

[donh]

When I am wearing my computer scientist hat, 1 + 1 = 0 usually.

I suspect it equals 10, usually, unless by "+" you mean something other than applying an add op code to a couple of CPU registers.