Anyway, here's my challenge: Write a program in standard C that works on either x86-64 or aarch64, but will not compile or not run, or produce a different result on the other architecture.

Editor's note: Robby Walker is co-founder and CTO of Cue. His previous company, Zenter, sold to Google in 2007. Programming challenges are a fantastic way to connect great people with great jobs ...

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