I need to print a ULONGLONG
value ( unsigned __int64
). What format should i use in printf
? I found %llu
in another question but they say it is for linux only.
Thanks for your help.
使用Google搜索“Visual Studio printf unsigned __int64”会生成此页面作为第一个结果,表示您可以使用前缀I64
,因此格式说明符将为%I64u
。
%llu
is the standard way to print unsigned long long
, it's not just for Linux, it's actually in C99. So the problem is actually to use a C99-compatible compiler, ie, not Visual Studio.
C99 7.19.6 Formatted input/output functions
ll(ell-ell) Specifies that a following d, i, o, u, x, or X conversion specifier applies to a long long int or unsigned long long int argument; or that a following n conversion specifier applies to a pointer to along long int argument.
I recommend you use PRIu64
format specified from a standard C library. It was designed to provide users with a format specifier for unsigned 64-bit integer across different architectures.
Here is an example (in C, not C++):
#include <stdint.h> /* For uint64_t */
#include <inttypes.h> /* For PRIu64 */
#include <stdio.h> /* For printf */
#include <stdlib.h> /* For exit status */
int main()
{
uint64_t n = 1986;
printf("And the winning number is.... %" PRIu64 "!\n", n);
return EXIT_SUCCESS;
}
Printf has different format specifiers for unsigned long long
depending on the compiler, I have seen %llu
and %Lu
. In general I would advice you to use std::cout
and similar instead.
这是HEX输出的解决方法
printf("%08X%08X", static_cast<UINT32>((u64>>32)&0xFFFFFFFF), static_cast<UINT32>(u64)&0xFFFFFFFF));
For guys who forget all the time like me,
If you use Visual Studio (MSVC),
%I64u
for uint64_t
(unsigned __int64)
%I64d
for int64_t
(__int64)
%Iu
for size_t
You should check this MSDN for the details, or just this section :)
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