check leap year or not and all century years are not leap years

Question

Write a program to check whether given year is leap year or not

note-that all century years or not leap years

example-1900

for example-input 2000   - yes

Answer 1

#include <iostream>

using namespace std;

int main()

{

 int year;

cout<<"enter the year:";

cin>>year;

if( year%100==0)

 {

   if (year%400==0)

cout<<"leap year\n";

  else

    cout<<"not a leap year\n";

 }

else if(year%4==0)

   cout<<"leap year\n";

 else

      cout<<"not a leap year\n";

 return 0;

}

Answer 2

#include<stdio.h>
main()
{
    int year;
    printf("enter year\n");
    scanf("%d",&year);
    if((year%4==0)&&(year%100!=0)||(year%400==0))
    printf("leap year");
    else
    {
        printf("not leap year");
    }

}

Answer 3

#include<stdio.h>
int main()
{
int year;
printf("Enter the year you want to check\n");
//take a user input
scanf("%d",&year);
//check leap year.
if(year%400==0)
{
printf("%d is leap year\n",year);
}
else if(year%100==0)
{
printf("%d is not a leap year\n",year);
}
else if(year%4==0)
{
printf("%d is a leap year\n",year);
}
else
{
printf("%d is not a leap year\n",year);
}
}

Leap year program