Kotlin program: Calculate circle area and perimeter

Kotlin Basic: Exercise-10 with Solution

Write a Kotlin program to calculate the area and perimeter of a circle.

Sample Solution:

Kotlin Code:

import kotlin.math.PI

fun main(args: Array) 
  {
    println("Input the radius of the circle:")
    val radius = args[0].toDoubleOrNull()

    if (radius != null && radius > 0) 
      {
        val area = calculateArea(radius)
        val perimeter = calculatePerimeter(radius)

        println("Radius of the circle: $radius")
        println("Area of the circle: $area")
        println("Perimeter of the circle: $perimeter")
     } 
      else 
      {
        println("Invalid input. Please enter a valid positive radius.")
     }
 }

fun calculateArea(radius: Double): Double {
    return PI * radius * radius
}

fun calculatePerimeter(radius: Double): Double {
    return 2 * PI * radius
}

Sample Output:

Input the radius of the circle:
Radius of the circle: 5.2
Area of the circle: 84.94866535306801
Perimeter of the circle: 32.67256359733385

Kotlin Editor:

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