c8_18.c

适合于初学者的C程序

/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{
	int sum_day(int,int);
	int leap(int year);
	int year,month,day,days;
	printf("input date(year,month,day);");
	scanf("%d,%d,%d",&year,&month,&day);
	printf("%d/%d/%d",year,month,day);
	days=sum_day(month,day);
	if(leap(year)&&month>=3)
	days=days+1;
	printf("is the %dth day in this year.\n",days);
	
}

int sum_day(int month,int day)
{
	int day_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	int i;
	for(i=1;i<month;i++)
	day+=day_tab[i];
	return(day);
}

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