时间比较函数

为什么要贴出这段代码，因为这段代码很有代表性，对刚入门的同学有点启发。

/* time */
typedef struct Time {
    uint8_t hour;
    uint8_t min;
    uint8_t sec;
    uint8_t hundredths;
} TIME_t;


/* if the time1 is the same as time2, return is 0
   if time1 is after time2, returns positive
   if time1 is before time2, returns negative
*/
int CompareTime(TIME_t &time1, TIME_t &time2)
{
    int diff = 0;

    diff = (int) time1.hour - (int) time2.hour;
    if (diff == 0)
    {
        diff = (int) time1.min - (int) time2.min;
        if (diff == 0)
        {
            diff = (int) time1.sec - (int) time2.sec;
            if (diff == 0)
            {
                diff = (int) time1.hundredths - (int) time2.hundredths;
            }
        }
    }

    return diff;
}