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结构体输出今天是今年的第几天?

[cpp]  
#include <iostream>  
using namespace std;  
struct Date  
{  
    int year;  
    int month;  
    int day;  
};  
int main()  
{  
    Date date;  
    cout<<"input year,month,day:";  
    cin>>date.year>>date.month>>date.day;  
    int days;  
    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;  www.zzzyk.com
    }  
    if(date.year%4==0 && date.year/100==0 || date.year%400==0)  
        date.day+=1;  www.zzzyk.com
    cout<<date.month<<"月"<<date.day<<"日是"<<date.year<<"年的第"<<days  
        <<"天."<<endl;  
    return 0;  
}  
补充:软件开发 , C++ ,
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