Kotlin Function: Calculate area of rectangle with default Values

Last update on February 04 2025 08:16:37 (UTC/GMT +8 hours)

Write a Kotlin function that calculates and returns the area of a rectangle. It should take 'length' and 'width' as arguments, with default values of 0.0.

Pre-Knowledge (Before you start!)

• Basic Kotlin Syntax.
• Kotlin Functions.
• Default Arguments.
• Arithmetic Operations.
• Printing Output.

Hints (Try before looking at the solution!)

• Define the Function.
• Calculate the Area.
• Call the Function.
• Display the Output.
• Test with Different Values.
• Common Errors to Avoid:
  • Forgetting default values.
  • Misplacing multiplication logic.
  • Not validating negative inputs.

Sample Solution:

Kotlin Code:

fun calculateArea(length: Double = 0.0, width: Double = 0.0): Double {
    return length * width
}

fun main() {
    val area = calculateArea(7.0, 3.0)
    println("The area of the rectangle is: $area")
}

Sample Output:

The area of the rectangle is: 21.0

Explanation:

In the above exercise -

• The "calculateArea()" function takes two parameters: length and width, both of type Double. These parameters have default values of 0.0, which means they can be omitted when calling the function.
• Inside the function, it calculates the rectangle area by multiplying the length and width values. The result is then returned as a Double value.
• In the "main()" function, we call the "calculateArea()" function with a length of 7.0 and width of 3.0. The returned area value is stored in the area variable, and then printed using println() function.

Kotlin Editor:

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