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Is there a way to fix the format specifier warnings for stdint types?

The problem is that on one platform (windows, mvsc2015) it uint64_t

is defined as unsigned long long

, and on another (ubuntu, clang) it is unsigned long

, and there is a code that looks like sprintf(buffer, "%#llx", u64key);

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3 answers


The solution is to use C99 format macros, in particular PRIu64

for uint64_t

:



#include <inttypes.h>
…
sprintf(buffer, "%#" PRIu64 "\n", u64key);
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Pascal's solution is the most direct and most idiomatic for a given particular type, but for writing is an alternative for printing arbitrary integer types whose definitions you don't know, just cast to intmax_t

or uintmax_t

, then using j

(for example, %jd

or %ju

). However, this may not work for most / all versions of the MSVC standard library as they are lagging behind standards compliance.



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You can use preprocessor directives to determine how the datatype is determined and compile another sprintf () with a different string.

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