[kbob]

I'd say, "Congratulations! You're one of today's luck 10,000!", but trigraphs aren't really much fun. Just another reminder that C is old, and computing is even older.

I've used uppercase-only terminals, and I've used ancient C, but not at the same time.

[WalterBright]

Ancient C didn't have trigraphs. My copy of K+R (1978) doesn't mention them.

[kragen]

No, they were a design error introduced by the ANSI committee.

[krylon]

I thought ISO added them when C went from ANSI C (1989) to ISO C (1990), along with wchar.h and such. I might misremember, though, it's been a long time since I did anything serious with C.

Come to think of it, didn't they remove trigraphs in one of the more recent iterations of the standard?

[kragen]

They did remove trigraphs in one of the more recent iterations. It's possible that it was as you say, but I have this vague memory that it was ANSI who added them. I think maybe what the ISO added were https://en.wikipedia.org/wiki/C_alternative_tokens.