# include <stdio.h>
int main ()
{
    int year,leap;
    printf ("input year:");
    scanf ("%d",&year);
    year=year/4==0 ?{ year=year/100==0 ? {year=year/400==0 ? leap=1 : leap=0 }: leap=1 }: leap=0;
    leap=1 ? printf("is leap year\n") : printf(" not is leap year\n");
    return 0;
}

I see, thank you!