comma operator: keep away?

[Wietse Z. Venema]

bobmon at iuvax.cs.indiana.edu (RAMontante) writes:
>Is there a circumstance in which the comma operator is required, where
>the compound statement cannot be broken into multiple statements?

"... in macros where a multistep computation has to be a single expression."
					K&R second edition, page 63.
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