c++程序 计算两个日期相差的天数



#include
#include
#include

using namespace std;

struct Date{
 int y;//year
 int m;//month
 int d;//day in month
};

int isLeap(int y)
{
 return y%4==0 && y%100==0 || y%400==0;
}

int daysOfMonth(Date d)
{
 int days[12]={31,0,31,30,31,30,31,31,30,31,30,31};
 if(d.m!=2)
  return days[d.m-1];
 else
  return 28+isLeap(d.y);
}

int daysOfDate(Date d)
{
 int days=0;
 for(int y=1;y<=d.y;y++)
  days+=365+isLeap(y);
 for(int m=1;m   days+=daysOfMonth(d);
 days+=d.d;
 return days;
}

int main()
{
 int a;
 Date d1,d2;
    cout << "Input 2 days days(yyyy mm dd):" << endl;
    cin >> d1.y >> d1.m >> d1.d ;
 cout << d1.y << "-" << d1.m << "-" << d1.d << endl;
 int days1=daysOfDate(d1);
    cout << "days1=" << days1 << endl;
 cin >> d2.y >> d2.m >> d2.d ;
 cout << d2.y << "-" << d2.m << "-" << d2.d << endl;
 int days2=daysOfDate(d2);
    cout << "days2=" << days2 << endl;
    cout << "days distance is " << fabs(days1- days2) << endl;

 return 0;
}