Kotlin program: Check if a year is a leap year

Last update on February 04 2025 06:49:58 (UTC/GMT +8 hours)

Write a Kotlin program to check if a given year is a leap year.

Pre-Knowledge (Before you start!)

• Basic Kotlin Syntax.
• Kotlin Functions.
• Conditional Statements.
• Boolean Logic.
• Modulo Operator.
• Leap Year Concept.
• String Interpolation.

Hints (Try before looking at the solution!)

• Define the main() Function.
• Create a Leap Year Function.
• Use Boolean Logic.
• Return a Boolean Value.
• Call the Function.
• Display the Output.
• Test with Different Years.
• Common Errors to Avoid:
  • Forgetting leap year rules for years divisible by 100 and 400.
  • Misplacing logic in Boolean expressions.
  • Using incorrect conditions.

Sample Solution:

Kotlin Code:

fun main() {
    val year = 2000
    //val year = 2003

       if (isLeapYear(year)) 
          {
            println("$year is a leap year.")
          } 
       else 
          {
            println("$year is not a leap year.")
          }
   }

fun isLeapYear(year: Int): Boolean {
    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
}

Sample Output:

2003 is not a leap year.

2000 is a leap year.

Explanation:

In the above exercise,

• Inside the "main()" function, a variable named year is declared and assigned a value.
• The program then checks if the given year is a leap year by calling the isLeapYear() function and passing the year as an argument.
• The result of the isLeapYear() function is evaluated in an if statement.
• If the function returns true, the year is a leap year. The program prints the message "$year is a leap year." using string interpolation.
• If the function returns false, the year is not a leap year. The program prints the message "$year is not a leap year." using string interpolation.

In the isLeapYear() function,

• It takes an integer year as a parameter and returns a boolean value (true if it's a leap year, false otherwise).
• Inside the function, a leap year is determined by the following conditions:
• The year should be divisible by 4.
• The year should not be divisible by 100, unless it is also divisible by 400.
• The function uses the modulo operator % to check these conditions and returns the result as a boolean value.

Kotlin Editor:

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