小编Iva*_*eia的帖子

I need to display some relevant information in #error preprocessor directive. For example:

#define myConstant 5

#if myConstant > 10
    #error myConstant has to be > 10, now %d  //should display "5"
#endif

How can I do that?

我很惊讶为什么得到不同的结果。

    uint16_t wCaptureTime = 35;

    wDeltaTime1 = (uint16_t) - (int16_t)wCaptureTime;
    wDeltaTime2 =  0xFFFF - (int16_t)wCaptureTime;

    printf("wDeltaTime1 %d \n", wDeltaTime1);
    printf("wDeltaTime2 %d \n", wDeltaTime2);

该代码导致：

wDeltaTime1 65501 
wDeltaTime2 65500 

有人可以解释或提供一些链接以了解该行为。