Cross platform format string for variables of type size_t? [duplicate]

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The PRIuPTR macro (from <inttypes.h>) defines a decimal format for uintptr_t, which should always be large enough that you can cast a size_t to it without truncating, e.g.

fprintf(stream, "Your size_t var has value %" PRIuPTR ".", (uintptr_t) your_var);

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