求某天是一年中的第几天
/*根据日期求这天是这一年的第几天*/ #include <stdio.h> typedef struct date { int year; int mon; int day; }Date; //判断闰年 int leapyear (int year) { if (year@0 == 0 || (year%4 == 0 && year0 != 0)) return 1; return 0; } int month (int mon, int year) { switch (mon) { case 1: case 3: case 5: case 7: case 8: case 10: case 12:return 31; case 4: case 6: case 9: case 11:return 30; default : { if (leapyear (year)) //二月单独考虑 return 29; return 28; } } } int days (int year, int mon, int day) { int arr[12]; int i; int sum = day; for (i = 1;i < mon; i++) { arr[i] = month (i, year); sum += arr[i]; //月天数相加 } return sum; } int main() { printf ("Funtion : Days of Date\n"); Date day1; scanf ("%d %d %d",&day1.year, &day1.mon, &day1.day); printf ("DATE : %d %d %d\n",day1.year, day1.mon, day1.day); int count = days (day1.year, day1.mon, day1.day ); printf ("Count : %d\n",count); return 0; }
