c++编写一个控制台程序,由用户输入年、月、日,计算该日是该年的第几天?

#include <iostream.h>

struct
{ int year;
int month;
int day;
}date;
int main()
{int days;
cout<<"input year,month,day:";
//char ch='\\';
cin>>date.year>>date.month>>date.day;
switch(date.month)
{ case 1: days=date.day; break;
case 2: days=date.day+31; break;
case 3: days=date.day+59; break;
case 4: days=date.day+90; break;
case 5: days=date.day+120; break;
case 6: days=date.day+151; break;
case 7: days=date.day+181; break;
case 8: days=date.day+212; break;
case 9: days=date.day+243; break;
case 10: days=date.day+273; break;
case 11: days=date.day+304; break;
case 12: days=date.day+334; break;
}
if ((date.year %4== 0 && date.year % 100 != 0
||date.year % 400 == 0) && date.month >=3)
d