What is inheritance in Swift?

Inheritance allows classes to inherit properties and methods from another class.

// Base class
class Vehicle {
    var wheels: Int
    
    init(wheels: Int) {
        self.wheels = wheels
    }
    
    func start() {
        print("Vehicle starting")
    }
}

// Derived class
class Car: Vehicle {
    var doors: Int
    
    init(doors: Int) {
        self.doors = doors
        super.init(wheels: 4)  // Call parent initializer
    }
    
    override func start() {
        super.start()  // Call parent method
        print("Car engine starting")
    }
}