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C is just perfect as it is.

But K&R C was (aesthetically) more perfect. ANSI could not live with that, apparently.

You mean no function prototypes or just the idea that declarations defaulted to int?

Only used ANSI so wondering what excellence of K&R C mean

Both. Note that a huge amount of groundbreaking code had been written in K&R C before someone decided that it was "not good enough."