/*  File leap4.cpp
    J. Shinnerl, 10/18/99
    Version 4 uses a boolean function.

    Receives a year from the user and says whether the year is a leap year.
    By definition, a leap year is any year divisible by 4 except for years
    that are divisible by 100 but not divisible by 400.
*/

#include<iostream>
using namespace std;

inline bool isLeapYear(int y)
{ return !( y%4 || !(y%100) &&  y%400 ); }

int main()
{
  cout << "\nEnter the year: ";
  int year;
  cin  >> year;
  if (isLeapYear( year ))
     cout << year << " is a leap year.\n";
  else
     cout << year << " is not a leap year.\n";

  cout << endl;
  return 0;
}

/*          SAMPLE I/0:
barcarolle.cs.ucla.edu.24> a.out

Enter the year: 1991
1991 is not a leap year.

barcarolle.cs.ucla.edu.25> a.out

Enter the year: 1992
1992 is a leap year.

barcarolle.cs.ucla.edu.26> a.out

Enter the year: 1994
1994 is not a leap year.

barcarolle.cs.ucla.edu.27> a.out

Enter the year: 1990
1990 is not a leap year.

barcarolle.cs.ucla.edu.28> a.out

Enter the year: 1900
1900 is not a leap year.

barcarolle.cs.ucla.edu.29> a.out

Enter the year: 2000
2000 is a leap year.

barcarolle.cs.ucla.edu.30> 
*/