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您好，请教一下。
videohd.h里的宏定义#define V4L2_STD_FR_50 （（V4l2_std_id）0x0008000000000000ULL），0x0008000000000000ULL如何理解？为什么打印出来是0呢？
ULL是unsigned long long的意思吗？
videohd.h里的宏定义#define V4L2_STD_FR_50 （（V4l2_std_id）0x0008000000000000ULL），为什么打印出来是0呢？其它的宏定义打印出来也是0.
videodev2.h里的宏定义#define V4L2_STD_SECAM_B （（V4l2_std_id）0x00080000）是正常的。
是否和ULL后缀有关呀？
你好，
应该和要打印的数据的位数有关。你打印的时候参考一下下面的信息：
%d--> for int
%d
int
%ld--> for long int
%ld
long int
%lld--> for long long int
%lld
long long int
%llu--> for unsigned long long int
%llu
unsigned long long int
