How to calculate the area of a circle in Scala

Overview

The area of a circle is the region occupied by the circle. It is the product of pi (π) and the square of the circle’s radius. To do this, we need to create a constant variable pi that will hold our pi value. Then we multiply this value by the square of the radius. We need to use the Math.pow() method to calculate the squared value of the radius. To do this, we need to import the scala.math library.

Syntax

pi * Math.pow(radius, 2)
Syntax for finding the area of a circle in Scala

Parameters

pi: This is the pi constant variable.

radius: This is the given radius of the circle.

Return value

A float value is returned, which is the area of the circle.

Example

// import math package 
import scala.math._
object Main extends App {
  // create a constant 
  val PI = 3.14F
  // create some radii
  var radius1 = 5
  var radius2 = 3.5F
  var radius3 = 20
  var radius4 = 4
  // get area of circles
  var area1 = PI * Math.pow(radius1, 2)
  var area2 = PI * Math.pow(radius2, 2)
  var area3 = PI * Math.pow(radius3, 2)
  var area4 = PI * Math.pow(radius4, 2)
  // print values 
  println(area1)
  println(area2)
  println(area3)
  println(area4)
}

Explanation

  • Line 2: We import the math module.
  • Line 6: We create a PI value.
  • Line 9–12: We create some radii.
  • Line 15–18: We get the area of some circles.
  • Line 21–24: We print the areas to the console.

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