大一新生，最后要有程序和运行结果

#include <stdio.h>
int main()
{
    int year,mon,day;
    int i,sum = 0;
    int arr[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    scanf("%d,%d,%d",&year,&mon,&day);
    if(year%4==0 && year%100 != 0 || year%400 == 0)
        arr[2] = 29;
    for (i=0;i<mon;i++)
    {
        sum += arr[i];
    }
    sum += day;
    printf("%d年%d月共有%d天\n",year,mon,arr[mon]);
    printf("%d年%d月%d日是今年的第%d天\n",year,mon,day,sum);
    return 0;
}