输入年月日，输出该月有多少天，这是今年的多少天

#include
int main()
{
int year,mon,day;
int i,sum = 0;
int arr[]={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[1] = 29;
for (i=0;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;
}