008 计算某一日是这一年的第几天

#include<stdio.h>
//判断是否为闰年
int isleap(int year){
	int leap;
	leap = year%400==0 || (year%4==0 &&year%100!=0);
	return leap;
}
//计算该日是这一年的第几天，并作为函数值返回
int fun(int year,int month,int day){
	int table[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
	int days = 0,i;
	for(i=1;i<month;i++){
		days = days + table[i];
	}
	days += day;
	if(isleap(year) && month>2){
		days += 1;
	}
	return days;
}
void main(){
	int year,month,day,days;
	printf("请输入年、月、日:");
	scanf("%d%d%d",&year,&month,&day);
	days = fun(year,month,day);
	printf("%d年%d月%d日是该年的第%d天\n",year,month,day,days);

}

演示地址：https://tool.lu/coderunner/?id=5bq