求閏年

#include <iostream>   
using namespace std;   
struct  y_m_d  
{   
int year;   
int month;   
int day;   
};   
     
int days(y_m_d date)  
{     
    int m=0,n=0;  
    int i;  
    if(date.year%400==0||date.year%100!=0&&date.year%4==0)   
    {  
        int a[12]={31,29,31,30,31,30,31,31,30,31,30,31};  
        for(i=0;i<(date.month-1);i++)  
        {  
            m=m+a[i];  
        }  
        return m+date.day;  
    }  
    else
    {  
        int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};  
        for(i=0;i<(date.month-1);i++)  
        {  
            n=n+a[i];  
        }  
        return n+date.day;  
    }  
}  
    
  
int main() 
{ 
    y_m_d date; 
    int days(y_m_d);   
    int day_sum; 
    cin>>date.year>>date.month>>date.day; 
    day_sum=days(date); 
    cout<<day_sum<<endl; 
    return 0; 
}