What printf format specifier can I use to print a 64 bit unsigned integer in hexadecimal notation across 32/64 bit and Windows/POSIX? The closest I've seen is %llX but I'm not sure that is portable enough. Answers that ignore older compilers (e.g. Visual Studio 2010) are acceptable.
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thmiller
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The PRIx64 macro in <inttypes.h> is what you're looking for.
It's a string token, so you can use it as:
fprintf(stdout, "answer = %"PRIx64"\n", val);
Since you specify %llX, you probably want uppercase; use: PRIX64
Brett Hale
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That was it. The inttypes reference I was looking at only had PRIx macros up to 32 bits for some reason. – thmiller Sep 23 '15 at 18:20
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1`printf("answer = %#018"PRIx64"\n", val)` to print leading zeros – Daniel May 12 '19 at 14:24
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You can use macros PRIx64 or PRIX64 (for unsigned uppercase hexadecimal integer ) defined in header <inttypes.h>.
ameyCU
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