计算某天是所在年的第几天

 1 #include <stdio.h>

 2 #include <stdbool.h>

 3 int main()

 4 {

 5     int y,m,d;

 6     while(scanf("%d%d%d",&y,&m,&d)){

 7         printf("%d\n",dayOfYear(y,m,d));

 8     }

 9     return 0;

10 }

11 // 判断是否是闰年 

12 bool isLeapYear(int inputYear){

13     if((inputYear%4==0&&inputYear%100!=0)||inputYear%400==0){

14         return true;    

15     }

16     else {return false;}

17 }    

18 int dayOfYear(int year,int month,int day){

19     int day_of_year;

20     if(isLeapYear(year)){

21         day_of_year=((275 * month)/9)-((month + 9)/12)+day-30;

22     }else{

23         day_of_year=((275 * month)/9)-(((month + 9)/12)<<1)+day-30;

24     }

25     return day_of_year;

26 } 

说明：

21行的275暂未解决