计算天数

 1 /*
 2     xuejineng2016@163.com
 3     2020年5月6日
 4 */
 5 #include<stdio.h>
 6 int main(void)
 7 {
 8     int year, month, day;
 9     int isleap;
10     int i;
11     //用数组定义每个月的天数
12     int tab[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} };
13 
14     scanf_s("%d/%d/%d", &year, &month, &day);
15     //闰年问题
16     isleap = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
17     for (i = 1; i < month; i++)
18     {
19         //计算从1月开始，月份的总天数
20         day = day + tab[isleap][i];
21     }
22     printf("%d
", day);
23 
24     return 0;
25 }