The range/xrange question was likely to check if you were a fraud.
Having interviewed close to a hundred people in a year for a senior C dev position I can assure you that people lie like you wouldn't believe. They cheat with take-home tasks, they show others' code as their own. And that's in the system programming circles, where the level of professionalism is typically much higher than in app/web development areas. We got burnt really bad when a brilliant dude whom we relocated across the country turned out to be the laziest moron I've ever had a misfortune to work with. So you bet we started most of the interviews with fuzz-buzz kind of questions.
Having interviewed close to a hundred people in a year for a senior C dev position I can assure you that people lie like you wouldn't believe. They cheat with take-home tasks, they show others' code as their own. And that's in the system programming circles, where the level of professionalism is typically much higher than in app/web development areas. We got burnt really bad when a brilliant dude whom we relocated across the country turned out to be the laziest moron I've ever had a misfortune to work with. So you bet we started most of the interviews with fuzz-buzz kind of questions.