Creating a public class, properties and functions

 Class Visibility:

 public - Default. Class and public members

 private - Inside Class. Subclasses can not see

 protected - Inside Class. Similar to private but Subclasses can see.

 internal - Module

Aquarium Class

package Aquarium
// File:            Main.kt
// Programmer:      Engineer Nolverto Urias Obeso
// Creation Date:   06/17/2023
// Email:           nolvertou@gmail.com
// Description:     Learning how to create an instance of a class

// main function is public by default
fun main() {
    buildAquarium()
}

// buildAquarium is public by default, which means your declarations will be visible everywhere
fun buildAquarium() {
    val myAquarium = Aquarium()

    println("Length: ${myAquarium.length} cm, " +
            "Width: ${myAquarium.width} cm, " +
            "Height: ${myAquarium.height} cm")

    myAquarium.height = 80

    println("Height: ${myAquarium.height} cm")
    println("Volume: ${myAquarium.height} liters")
}

Main function

package Aquarium

// main function is public by default
fun main() {
    buildAquarium()
}

// buildAquarium is public by default, which means your declarations will be visible everywhere
fun buildAquarium() {
    val myAquarium = Aquarium()

    println("Length: ${myAquarium.length} cm, " +
            "Width: ${myAquarium.width} cm, " +
            "Height: ${myAquarium.height} cm")

    myAquarium.height = 80

    println("Height: ${myAquarium.height} cm")
    println("Volume: ${myAquarium.height} liters")
}

Output:

Length: 100 cm, Width: 20 cm, Height: 40 cm
Height: 80 cm
Volume: 80 liters

Process finished with exit code 0