日期运算

日期运算代码如下：

 1 #include <cstdio>
 2 #include <cstdlib>
 3 
 4 #define n 12
 5 
 6 int main()
 7 {
 8     int a[n] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
 9     int b[n] = { 0 };
10     int year, mon, day, i, j, total;
11     for (i = 0; i < n; i++)
12         for (j = 0; j <= i; j++)
13             b[i] += a[j];
14 
15     while (scanf_s("%d%d%d", &year, &mon, &day) != eof)
16     {
17         total = 0;
18         //for (i = 0; i < mon - 1; i++)
19         //    total += a[i];
20         total += b[mon - 2];
21         if (mon > 2)
22             total += year % 4 == 0 && year % 100 != 0 || year % 400 == 0;        //判断闰年
23         total += day;
24         printf("%d-%02d-%02d is %dth\n", year, mon, day, total);
25     }
26     system("pause");
27     return 0;
28 }