#include<stdio.h>
 
typedef struct{
    int year;
    int month;
    int day;
}Date;
 
Date input_date(Date days);
int isLeap(Date days);
 
int main(void)
{
    Date date;
 
    date=input_date(date);
 
    if(isLeap(date)){
        printf("%d/%d/%d is a leap.\n",date.year,date.month,date.day);
    }
 
    return 0;
}
 
Date input_date(Date ymd)
{
    printf("year : ");scanf("%d",&ymd.year);
    printf("month : ");scanf("%d",&ymd.month);
    printf("day : ");scanf("%d",&ymd.day);
 
    return ymd;
}
 
int isLeap(Date days)
{
    return(days.year%4==0&&days.year%100!=0||days.year%400==0);
}
 

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2020 10 29