c++ - 奇怪陈述中的优先级和数量

Question

这条语句的执行顺序和可能的结果是什么:leap = year%4 == 0;

(左边是赋值，右边是断言？)以下算法摘录用于计算公历中任何日期的星期几:

static char daytab[2][13] =
{
                {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
                {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};
for (year = 1; year <= y; year++)
{
        leap  = year%4 == 0;
        if (year%100 == 0 && year%400 != 0)
                leap = 0;
        for (month = 1; month <= m; month++)
        {
                d += daytab[leap][month - 1];
                daystotal = 365*(year - 1) + (int)floor((year-1)/4)
                - (int)floor((year - 1)/100) + (int)floor((year - 1)/400) + d;
        }
}

Answer 1

看这里operator precendence . year % 4 将被评估，然后结果将与 0 进行比较，然后将结果分配给 leap 变量。