Answer:
Java program given below
Explanation:
import java.util.Scanner;
public class LeapYearCheck {
public static void main(String[] args) {
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Scanner in=new Scanner(System.in);
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while(true)
{
 System.out.print("Enter a year (0 to stop): ");
int year=in.nextInt();
// System.out.println();
if(year==0)
{
 System.out.println("Bye.");
 break;
}
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 boolean leap = false;
 if(year % 4 == 0)
 {
 if( year % 100 == 0)
 {
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 if ( year % 400 == 0)
 leap = true;
 else
 leap = false;
 }
 else
 leap = true;
 }
 else
 leap = false;
 if(leap)
 System.out.println(year + " is a leap year.");
 else
 System.out.println(year + " is not a leap year.");
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}
}
}