Skip to content

Add perimeter calculations in maths folder #94

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
54 changes: 54 additions & 0 deletions src/main/kotlin/math/Perimeter.kt
Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
package math

import java.lang.IllegalArgumentException
import kotlin.math.pow

/**
* Calculate the perimeter of a rectangle
*
* @param length length of rectangle
* @param width width of rectangle
* @return perimeter of given rectangle
*/
fun perimeterOfARectangle(length: Double, width: Double) = when {
length > 0 && width > 0 -> 2 * (length + width)
else -> throw IllegalArgumentException("Length and Width must be positive")
}

/**
* Calculate the perimeter of a square
*
* @param sideLength side length of square
* @return perimeter of given square
*/
fun perimeterOfASquare(sideLength: Double) =
when {
sideLength > 0 -> 4 * sideLength
else -> throw IllegalArgumentException("Side Length must be positive")
}

/**
* Calculate the perimeter of a triangle
*
* @param base base of triangle
* @param sideLength1 side length of triangle
* @param sideLength2 other side length of triangle
* @return perimeter of given triangle
*/
fun perimeterOfATriangle(base: Double, sideLength1: Double, sideLength2: Double) =
when {
base > 0 && sideLength1 > 0 && sideLength2 > 0 -> base + sideLength1 + sideLength2
else -> throw IllegalArgumentException("Base and Sides of the triangle must be positive")
}

/**
* Calculate the perimeter of a circle
*
* @param radius radius of circle
* @return perimeter of given circle
*/
fun perimeterOfACircle(radius: Double) =
when {
radius > 0 -> 2 * Math.PI * radius
else -> throw IllegalArgumentException("Radius must be positive")
}
34 changes: 34 additions & 0 deletions src/test/kotlin/math/PerimeterTest.kt
Original file line number Diff line number Diff line change
@@ -0,0 +1,34 @@
package math

import org.junit.Test
import java.lang.IllegalArgumentException

class PerimeterTest {
@Test
fun testPerimeterOfARectangle() = assert(perimeterOfARectangle(10.0, 5.0) == 30.0)

@Test
fun testPerimeterOfASquare() = assert(perimeterOfASquare(5.0) == 20.0)

@Test
fun testPerimeterOfACircle() = assert(perimeterOfACircle(1.0) == 2 *Math.PI)

@Test
fun testPerimeterOfATriangle() = assert(perimeterOfATriangle(5.0, 10.0, 10.0) == 25.0)

@Test(expected = IllegalArgumentException::class)
fun testPerimeterWithNegatives() {
perimeterOfARectangle(-1.0, 0.0)
perimeterOfASquare(-1.0)
perimeterOfACircle(-1.0)
perimeterOfATriangle(-1.0, 1.0, 1.0)
}

@Test(expected = IllegalArgumentException::class)
fun testPerimeterWithZeros() {
perimeterOfARectangle(0.0, 0.0)
perimeterOfASquare(0.0)
perimeterOfACircle(0.0)
perimeterOfATriangle(0.0, 1.0, 1.0)
}
}