C语言编程练习（day of the year）

#include<stdio.h>

int sum_day(int month, int day); /*求得总天数，为考虑闰年*/

int leap(int year); /*是否闰年*/

int main(void)

{

int year, month, day;

int days;

printf("Please input the date(year,month,day): ");

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

days = sum_day(month, day);

if(leap(year) && month >=3)

{

days = days + 1;

printf("This is leap year!\n");

}

else

{

printf("This is not leap year.\n");

}

printf("This is the %dth day of the year.\n", days);

return 0;

}

static int day_tab[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int sum_day(int month, int day)

{

int i;

for(i=1; i<month; i++)

{

day = day + day_tab[i];

}

return day;

}

int leap(int year)

{

int lp;

lp = (year % 4 == 0 && year %100 != 0) || (year % 400 == 0);

return lp;

}
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