#include <stdio.h>
int main()
{
    int year;
   
    printf("Enter a year to be checked : ");
    scanf("%d",&year);
   
    if(year % 4 == 0)
    {
        if( year % 100 == 0)
        {
            if ( year % 400 == 0)
                printf("%d is a leap year.", year);
            else
                printf("%d is not a leap year.", year);
        }
        else
            printf("%d is a leap year.", year );
    }
    else
        printf("%d is not a leap year.", year);
    return 0;
}

 OUTPUT :

Enter a year to be checked : 2012
2012 is a leap year

Enter a year to be checked : 2019
2019 is a not leap year

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