CODEWITHSUNDEEP
swift
AllocSystems
AllocSystems

Reputation: 1099

Initialization in swift

I am trying to do this exercise. I keep getting errors.

"Create a Triangle class with properties to store the length of each side. Triangles are called scalene when all three sides are of different lengths, isosceles when two sides have the same length, or equilateral when all three sides have the same length. Create an initializer for your class that takes three arguments and properly sets the class properties. Next, create a second initializer to use when your triangle is equilateral. Remember that all three sides will be the same length, so this method should only take one argument, but should still set all three properties.

My code:

class Triangle {

   var sideA: Int
   var sideB: Int
   var sideC: Int

   init(sideA: Int, sideB: Int, sideC: Int) {

      self.sideA = sideA
      self.sideB = sideB
      self.sideC = sideC
   }

   override convenience init() {

      //I can figure this part out, no problem.
   }

   // I cannot figure out the next part.

Upvotes: 3

Views: 143

Answers (3)

Luca Angeletti
Luca Angeletti

Reputation: 59536

So you need to provide an initializer to create an equilateral Triangle

class Triangle {

    var sideA: Int
    var sideB: Int
    var sideC: Int

    init(sideA: Int, sideB: Int, sideC: Int) {

        self.sideA = sideA
        self.sideB = sideB
        self.sideC = sideC
    }

    convenience init(equilateralWithEdge edge:Int) {
        self.init(sideA: edge, sideB: edge, sideC:edge)
    }

}

Now you can build an equilateral Triangle writing

let triangle = Triangle(equilateralWithEdge: 10)

Test

triangle.sideA // 10
triangle.sideB // 10
triangle.sideC // 10

Upvotes: 1

Andreas
Andreas

Reputation: 2745

Since you're saying you can figure out the insides of the convenience init yourself:

Add a parameter to your convenience init, remove the override unless you're overriding something (doesn't look like it), and close the class definition with a }. You're done.

Upvotes: 1

Sweeper
Sweeper

Reputation: 274423

You seem to be stuck on the convenience init part.

As the question suggests, your initializer for equilateral triangles should take 1 parameter, so let's add one:

convenience init(sideLength: Int) {

}

Every convenience inititalizer must call a designated constructor or another convenience constructor. In this case, you can just call the other designated constructor that takes 3 parameters.

convenience init(sideLength: Int) {
    self.init(sideA: ???, sideB: ???, sideC: ???)
}

You're almost done. You just need to figure out the parameters.

I think at this point you can guess what the three parameters are. Have a go!

Answer here:

self.init(sideA: sideLength, sideB: sideLength, sideC: sideLength)

Upvotes: 1

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