Swift Tutorial - Tutorialspoint

When we run the above program using playground, we get the following result:

Instance physics is: solid physics

Instance equation is: Hertz

Instance physics is: Fluid Dynamics

Instance formulae is: Giga Hertz

Chemistry topics are: 'solid physics', Hertz

Maths topics are: 'Fluid Dynamics', Giga Hertz

Chemistry topics are: 'Thermo physics', Decibels

Maths topics are: 'Astro Physics', MegaHertz

Maths topics are: 'Differential Equations', Cosine Series

Typecasting:Any and Any Object

The keyword 'Any' is used to represent an instance which belongs to any type including
function types.

class Subjects {

var physics: String

init(physics: String) {

self.physics = physics

}

}

class Chemistry: Subjects {

var equations: String

init(physics: String, equations: String) {

self.equations = equations

super.init(physics: physics)

}

}

class Maths: Subjects {

var formulae: String

init(physics: String, formulae: String) {

self.formulae = formulae