int fun十位起隔位求和(int n)
{//缘由https://ask.youkuaiyun.com/questions/7449130?spm=1005.2025.3001.5141
int sum = 0;
n /= 10;
while (n)
{
sum += n % 10;
n /= 100;
}
return sum;
}
int fun判断闰年(int year)
{
int leap;
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
leap = 1;
else
leap = 0;
return leap;
}