Stage 1 Task: Mobile

Circle.kt

import kotlin.time.times


/**
 * Write a program that creates a [Circle] with the first constructor,
 * a circle with the second constructor and a circle with the third constructor.
 * Then print the area, circumference, description and color of each circle.
 * [Notice] : Please kindly note that steps 2-4 is covered ones in the class constructor where:
 * 1. user can invoke the class with no parameters
 * 2. user can invoke the class with only radius as a parameter and the color is already set to "red"
 * 3. user can invoke the class with two parameters
 * */

const val pi = 3.142
class Circle(
    private var radius: Double = 1.0,
    private var color: String = "red"
){
    /**
     * A method that returns the [getArea] of a circle*/
    fun getArea()= pi.times(radius.times(radius))

    /**
     * A method that returns the [getCircumference] of a circle*/
    fun getCircumference() = 2*pi.times(radius)

    /**
     * A method that returns the [getDescription] of a circle*/
    fun getDescription() = run { "Radius: $radius  Color: $color"}

    /**
     * A method that returns the [getColor] of a circle*/
    fun getColor() = color
}



/**
 * You can edit, run, and share this code.
 * play.kotlinlang.org
 */
fun main() {
   val circle1 = Circle()

    println("Circle 1:")
    println("Area:${circle1.getArea()}")
    println("Circumference:${circle1.getCircumference()}")
    println("Description:${circle1.getDescription()}")
    println("Color:${circle1.getColor()}\n")

    val circle2 = Circle(radius = 2.0)
    println("Circle 2:")
    println("Area:${circle2.getArea()}")
    println("Circumference:${circle2.getCircumference()}")
    println("Description:${circle2.getDescription()}")
    println("Color:${circle2.getColor()}\n")

    val circle3 = Circle(radius = 2.0, color = "blue")
    println("Circle 3:")
    println("Area:${circle3.getArea()}")
    println("Circumference:${circle3.getCircumference()}")
    println("Description:${circle3.getDescription()}")
    println("Color:${circle3.getColor()}")
}