The difference between their birthdays

Enter the code:

/**copyright (c) 2014, College of Computer and Control engineering, Yantai University *all rights reserved.* file name: sum123.cpp* Author: Lin Haiyun * Completion date: December 23, 2014 * Version number: v2.0** Problem Description: Enter two people's birthday, ask for the difference in days * Program input: * Program output: */#include <iostream> #include <cmath>using namespace Std;int day (int y,int    M,int d); struct date{int year;    int mouth; int day;};    int main () {Date date1,date2;    int sum1,sum2,s=0;    cout<< "Please enter the first person's birthday:" <<endl;    cin>>date1.year>>date1.mouth>>date1.day;    cout<< "Please enter a second person's birthday:" <<endl;    cin>>date2.year>>date2.mouth>>date2.day;    Sum1=day (Date1.year,date1.mouth,date1.day);    Sum2=day (Date2.year,date2.mouth,date2.day);            if (date1.year>date2.year) {while (date1.year>=date2.year) {date1.year--; if ((date1.year%4==0) && (date1.year%100!=0) | |            (date1.year%400==0))            {s+=366;            } else s+=365;        date1.year--;        } sum1+=s;  sum1-=sum2;      cout<< "Two people's birthday difference is:" <<sum1<<endl;            } else if (Date1.year<date2.year) {while (date2.year>=date1.year) {date2.year--; if ((date2.year%4==0) && (date2.year%100!=0) | |            (date2.year%400==0))            {s+=366;            } else s+=365;        date2.year--;        } sum2+=s;        SUM2-=SUM1;    cout<< "Two people birthday difference:" <<sum2<<endl;    } else cout<< "The difference between birthdays for two" <<fabs (sum1-sum2) <<endl; return 0;}    int day (int y,int m,int d) {int sum=0,i; for (I=1; i<=m; i++) {if (i==1| | i==3| | i==5| | i==7| | i==8| |i==10| |        I==12) sum+=31; else if (i==4| | i==6| | i==9| |        i==11) sum+=30; else {if (y%4==0 && (y%100!=0) | |                (y%400==0))            sum+=29;        else sum+=28;    }} Sum+=d; return sum;}

Operation Result:

The difference between their birthdays