结构体计算两人生日相差几天

#include <iostream>using namespace std;struct Date{int year;int month;int day;};int days(Date date);int main(){int xc;Date date1,date2;cout<<"input 第一位同学出生 year,month,day:";cin>>date1.year>>date1.month>>date1.day;cout<<"input 第二位同学出生 year,month,day:";cin>>date2.year>>date2.month>>date2.day;int days1,days2;days1=days(date1);days2=days(date2);xc=days1-days2;if(xc<0)xc=-xc;cout<<"两人生日相差"<<xc<<"天"<<endl;return 0;}int days(Date date){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;}if(date.year%4==0 && date.year/100==0 || date.year%400==0)date.day+=1;return days;}