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    The only argument in favor of supporting printf(“%s”, NULL) -> “(null)” that comes to my mind is to aid debugging. Using something like fprintf(stderr, “Whatever: %s”, s) for debugging and getting a “Whatever: (null)” back is somewhat more helpful than the process crashing.

    That said I believe the advantages of not supporting NULL in printf outweight the disadvantages: Simpler code, early crashes in case of unexpected NULL and you can’t count on (null) working anyway, because it’s not required by any standard.