Python Programs

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Python Programs - Conditional Statements

Check if a year is a leap year - Python Program

Example 1 :

year = int(input("Enter year: "))

if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
    print("Leap year")
else:
    print("Not a leap year")

 
OUTPUT  :
Enter year: 2024
Leap year

Example 2 : Advanced Program

def is_leap_year(year):
  """
  Checks if a given year is a leap year.

  Args:
    year: An integer representing the year.

  Returns:
    True if the year is a leap year, False otherwise.
  """
  if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
    return True
  else:
    return False

# Get input from the user
try:
  year_to_check = int(input("Enter a year: "))

  # Check if it's a leap year and print the result
  if is_leap_year(year_to_check):
    print(f"{year_to_check} is a leap year.")
  else:
    print(f"{year_to_check} is not a leap year.")

except ValueError:
  print("Invalid input. Please enter a valid year (an integer).")

 
OUTPUT 1 :    
Enter a year: 2024
2024 is a leap year.


OUTPUT 2 :   
Enter a year: 1900
1900 is not a leap year.


OUTPUT 3 :   
Enter a year: 2000
2000 is a leap year.


OUTPUT 4 :   
Enter a year: abc
Invalid input. Please enter a valid year (an integer).

Explanation

• is_leap_year(year)Function :
  • This function takes an integer yearas input.
  • It implements the leap year rules using a single ifcondition with logical and (and) and or (or) operators.
  • year % 4 == 0 and year % 100 != 0: This part checks if the year is divisible by 4 but not by 100 (e.g., 2024).
  • year % 400 == 0: This part checks if the year is divisible by 400 (e.g., 2000).
  • The oroperator combines these two conditions, meaning if either one is true, the year is a leap year.
  • It returns Trueif the year is a leap year, False
• User Input and Output:
  • year_to_check = int(input("Enter a year: ")): This line prompts the user to enter a year and converts the input string to an integer.
  • A try-exceptblock is used to handle potential ValueError if the user enters non-integer input.
  • The is_leap_year()function is called with the user's input.
  • An if-elsestatement then prints whether the entered year is a leap year or not based on the function's return value.