c - printf and (signed) int of unknown size -


i have platform dependent type defined in code: typedef uint64_t mytype;

however on more limited platform, might 32 bits.

how printf it? in, in current situation, can use %llu, if on platform it's 32 bits, not best idea.

i thought using macros, know of better way? i'd love hear format specifier take length next argument, example.

since have platform-specific types, should easy enough use platform-specific format strings well, like:

#ifdef using_64_bits     typedef uint64_t mytype;     #define my_type_fmt priu64 #else     typedef uint32_t mytype;     #define my_type_fmt priu32 #endif

then can use with:

mytype var1 = 42, var2 = 99; printf ("%6" my_type_fmt ", %019" my_type_fmt "\n", var1, var2);

the extraction of % format string allows insert other format specifiers dynamically, such field widths , padding characters.

you'll notice i've avoided %llu-style format specifiers, should using more targeted ones in inttypes.h since implementation give correct 1 type.


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