My final code:

Code:
 
#include <iostream>

int year;
int leap;
int leap2;
int leap3;


int main()
{
	std::cout << "Enter a year and I will determine if it's a leap year:  " ;
	std::cin >> year ;
	
	leap = year % 4 ;
	leap2 = year % 100 ;
	leap3 = year % 400 ;

  if(leap == 0 || leap3 == 0 && leap2 != 0 )
  {
				std::cout << "It is a leap year." << '\n' ;
				
			 }
		else 
			{
				std::cout << "It is not a leap year." << '\n' ;
  }
   	
  return 0;
}