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iOS Object-Oriented Swift Value vs Reference Types Final Exam - Solution

Posted by Deepa Laxmi
Deepa Laxmi
3,035 Points

Not able to call convenience init

I am getting an error in designated initializer "Expected 'get', 'set', 'willSet' or 'didSet' keyword to start an accessor definition " and also not able to call convenience init.

I am not able to instantiate of Square using the convenience initializer .

Here is my code:

import UIKit
class Shape {
    let sides : Int
    let name : String
    init(sides: Int, name: String)
    {
        self.sides = sides
        self.name = name
    }  
}
class Square : Shape {
    var sideLength: Double = 0.0
    var area: Double {
        get{
           return sideLength * sideLength
        }
        set{
            sideLength = sqrt(newValue)
        }
        init(name: String, sides: Int, sideLength: Double)
        {
            self.sideLength = sideLength
            super.init(sides: sides, name: name)
        }
        convenience init(sideLength: Double)
        {
        self.init( name: "Square", sides: 4, sideLength: sideLength)
        } 
    }
}
var pol = Square(sides: 4, name: square)

Please help me out. Thanks in advance

1 Answer

Nathan F.
Nathan F.
30,773 Points
Nathan F.
Nathan F.
30,773 Points

Your problem is you forgot a closing curly brace, so your computed property, area, includes the init declarations inside its own curly braces. Add a curly brace where I marked it in a comment. 

class Square : Shape {
    var sideLength: Double = 0.0
    var area: Double {
        get{
           return sideLength * sideLength
        }
        set{
            sideLength = sqrt(newValue)
        }
// ---> HERE 
        init(name: String, sides: Int, sideLength: Double)
        {
            self.sideLength = sideLength
            super.init(sides: sides, name: name)
        }
        convenience init(sideLength: Double)
        {
        self.init( name: "Square", sides: 4, sideLength: sideLength)
        } 
    }
}
Deepa Laxmi
Deepa Laxmi
3,035 Points

Thank you so much Nathan Fulkerson for helping to find out my silly mistake :D