C语言计算一年中的第几天 - 代码实现及解析

#include<stdio.h>

int isLeapYear(int year) { if((year%4==0 && year%100!=0) || year%400==0) { return 1; } return 0; }

int main() { printf("Enter year month day:");

int year, month, day;

int daysOfMonth[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}
};

scanf("%d%d%d",&year,&month,&day);

int days=0;

for(int i=1;i<month;i++)
{
    days+=daysOfMonth[isLeapYear(year)][i];
}

days+=day;

printf("day of year is %d",days);

return 0;

}