输出年月日

#include<stdio.h>
void month_day(int year,int yearday,int*pmonth,int *pday);
int main(){
int day,month,year,yearday;
printf("input year and yearday:");
scanf("%d%d",&year,&yearday);
month_day(year,yearday,&month,&day);
printf("%d-%d-%d\n",year,month,day);
return 0;
}
void month_day(int year,int yearday,int*pmonth,int *pday){
int k,leap;
int tab[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}
};

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

for(k=1;yearday>tab[leap][k];k++){
yearday-=tab[leap][k];
}
*pmonth=k;
*pday=yearday;
}