## Q. Write a program to check whether the given year is leap year or not.

Leap year :- A leap year is a calendar year that contains an additional day added to keep the calendar year synchronized. A leap year is exactly divisible by 4, except for the century years (the years ending with 00). Century year is a leap year only if it is completely divisible by 400.

For Example:-
Input = 1999
Output = 1999 is not a leap year
So as we can see that 1999 is not a leap year because 1999 is not divisible by 4.

#### Leap Year Algorithm

```START
Step 1 → Initialize variable year
Step 3 → Check if year is divisible by 4 but not by 100, DISPLAY "leap year"
Step 4 → Check if year is divisible by 400, DISPLAY "leap year"
Step 5 → Otherwise, DISPLAY "not leap year"
STOP
```

#### Leap Year Program

• C
• C++
• Java
• Python
• C#
• PHP
• ```#include <stdio.h>
int main() {
int check_year=1998;
if (check_year % 4 == 0) {
if (check_year % 100 == 0) {
// the check_year is a leap year if it is divisible by 400.
if (check_year % 400 == 0)
printf("%d is a leap year.", check_year);
else
printf("%d is not a leap year.", check_year);
} else
printf("%d is a leap year.", check_year);
} else
printf("%d is not a leap year.", check_year);
return 0;
}
```
```#include <bits/stdc++.h>
using namespace std;
int main()
{
int check_year=1998;
if (check_year % 4 == 0)
{
if (check_year % 100 == 0)
{
if (check_year % 400 == 0)
cout << check_year << " is a leap year.";
else
cout << check_year << " is not a leap year.";
}
else
cout << check_year << " is a leap year.";
}
else
cout << check_year << " is not a leap year.";
return 0;
}
```
```public class Main {
public static void main(String[] args) {
int check_year = 1998;
boolean leap = false;
if(check_year % 4 == 0)
{
if( check_year % 100 == 0)
{
// check_year is divisible by 400, hence the check_year is a leap year
if ( check_year % 400 == 0)
leap = true;
else
leap = false;
}
else
leap = true;
}
else
leap = false;
if(leap)
System.out.println(check_year + " is a leap year.");
else
System.out.println(check_year + " is not a leap year.");
}
}
```
```# Python program to check if year is a leap year or not
check_year = 1998
# To get year (integer input) from the user
# check_year = int(input("Enter a year: "))
if (check_year % 4) == 0:
if (check_year % 100) == 0:
if (check_year % 400) == 0:
print("{0} is a leap year".format(check_year))
else:
print("{0} is not a leap year".format(check_year))
else:
print("{0} is a leap year".format(check_year))
else:
print("{0} is not a leap year".format(check_year))
```
```using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Program
{
class leapyear
{
static void Main(string[] args)
{
leapyear obj = new leapyear();
obj.leap();
}
int check_year;
{
check_year = 1998;
}
public void leap()
{
if ((check_year % 4 == 0 && check_year % 100 != 0) || (check_year % 400 == 0))
{
Console.WriteLine("{0} is a Leap Year", check_year);
}
else
{
Console.WriteLine("{0} is not a Leap Year", check_year);
}
}
}
}
```
```function isLeap(\$check_year)
{
return (date('L', mktime(0, 0, 0, 1, 1, \$check_year))==1);
}
//For testing
\$check_year=1998;
If (isLeap(\$check_year))
{
echo "\$check_year is a Leap Year\n";
}
else
{
echo "\$check_year is not a Leap Year\n";
}
```
```#include <stdio.h>
int main() {
int check_year=1998;
if (check_year % 4 == 0) {
if (check_year % 100 == 0) {
// the check_year is a leap year if it is divisible by 400.
if (check_year % 400 == 0)
printf("%d is a leap year.", check_year);
else
printf("%d is not a leap year.", check_year);
} else
printf("%d is a leap year.", check_year);
} else
printf("%d is not a leap year.", check_year);
return 0;
}
```

#### Output

```1998 is not a leap year.
```

## Recommended Programs

Binary search algorithm and program
Bubble sort program (Ascending Order)