输入日期判断是这一年的第几天
#include <stdio.h>int tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
void main( )
{
int day_year(int y,int m,int d);
int year,month,day;
printf("请输入年月日：\n");
scanf("%d%d%d",&year,&month,&day);
printf("是这年的第%d天\n",day_year(year,month,day));
}
int day_year(int y,int m,int d)
{
int i,s=0;
for(i=1;i<m;i++)
s=s+tab[i];
if((y%4==0&&y%100!=0||y%400==0)&&m>=3)
s++;
return (s+d);
}
倒数第三行&&m>=3是用来干什么的啊？
