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Terrez dawson-holland
1,656 PointsWhats wrong with my code?
Im stuck on getter and setter methods 2 stage 3 properties
It wants me to input a getter and setter method..
"When the user assigns a value to the fahrenheit property, the setter method will calculate and assign a value to the celsius property. (Note: Celsius = (Fahrenheit-32)/1.8))"
class Temperature {
var celsius: Float = 0.0
var Fahrenheit: Float {
get { return (celsius * 1.8) + 32.0 }
set { celsius = (Fahrenheit-32)/1.8 }
}
}
nec
3,886 PointsI don't fully understand your question. Are you asking why you have to redefine Fahrenheit within the "set" method? Or elsewhere?
Jeanne Merle
3,390 Pointsin fact, I just wanted to return the value (in the "get method") without using a conversion. I just wanted to return "self.fahrenheit" but it wasn't good ...
nec
3,886 PointsI don't believe you can use self.fahrenheit inside the get method because it is a function of the variable fahrenheit. What is inside the curly brackets are used to compute the value of fahrenheit. The value of fahrenheit does not yet exist.
This is different from using the self.fahrenheit in an init method for example where you are telling the computer that whatever value is stored in fahrenheit should be used as the initial value.
This is my understanding of it from the courses in the Swift Track.
1 Answer
nec
3,886 PointsI think you need to use newValue in place of Fahrenheit in your setter method.
Terrez dawson-holland
1,656 PointsOk that worked but why?
nec
3,886 PointsFahrenheit is a computed property which does not have a stored value so you need to use the newValue cause you can't call it directly in the setter method.
I don't have had much experience using the getter and setter method yet so I can't give a more in depth answer. Perhaps more experienced developer can chime in.
Jeanne Merle
3,390 PointsJeanne Merle
3,390 Pointsin my "get" method, I wrote :
get { return self.fahrenheit }
why do i have to re-define the result with celsius althought fahrenheit has its own value ?
thx