6月23日思考题

[c]代码库

#include <stdio.h>
struct Date {
  int year;
  int month;
  int day;
};
int main() {
  struct Date date;
  int leap, sum;
  printf("输入年,月,日:");
  scanf("%d%d%d", &date.year, &date.month, &date.day);
  switch (date.month) {
  case 1:
    sum = 0;
    break;
  case 2:
    sum = 31;
    break;
  case 3:
    sum = 59;
    break;
  case 4:
    sum = 90;
    break;
  case 5:
    sum = 120;
    break;
  case 6:
    sum = 151;
    break;
  case 7:
    sum = 181;
    break;
  case 8:
    sum = 212;
    break;
  case 9:
    sum = 243;
    break;
  case 10:
    sum = 273;
    break;
  case 11:
    sum = 304;
    break;
  case 12:
    sum = 334;
    break;
  }
  sum += date.day;
  leap = date.year % 400 == 0 || (date.year % 4 == 0 && date.year % 100 != 0)
             ? 1
             : 0;
  if (date.month > 2)
    sum += leap;
  printf("这一天是这一年的第%d天\n", sum);
  return 0;
}