## Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

### Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Assume you are creating a Weather app and are provided the temperature in Celsius. We need to create a read-only computed property called Fahrenheit which will return a computed value. (Note: Fahrenheit = (Celsius * 1.8) + 32)

and given some code:

class Temperature { var celsius: Float = 0.0
}

Temperature.swift
```class Temperature {
var celsius: Float = 0.0

}
``` They give you the formula, and the video right before it clearly shows how to create a computed property. Review the video, and look at this question again.

Oh, I made it. I was confused with uppercasing the first letter,because in the task it gives 'F'ahrenheit and 'C'e'sius.

class Temperature { var celsius: Float = 0.0 var fahrenheit: Float { return celsius * 1.8 + 32 } }

```class Temperature {
var celsius: Float = 0.0
var fahrenheit: Float {
return (celsius * 1.8) + 32
}
}
```

Computed properties do not actually store a value in memory, so instead of assigning a value to the fahrenheit computed property we create here, it is used to calculate and return the respective fahrenheit value for temperature. Read only computed properties, like this one here, has a getter but no setter, and always returns a value that cannot be set to a different value. (Hence read-only) However, it still needs to be declared using the keyword var, despite it's seemingly constant-like behavior, because it's value is still not fixed. A more complete calculation is here.

```class Temperature {
var celsius: Float = 0.0
var fahrenheit: Float {
return celsius * 1.8 + 32
}

init (celsius: Float) {
self.celsius = celsius
}

}

let weather = Temperature (celsius: 1)
weather.fahrenheit
```

This answer above will calculate the conversion. Hope this helps. class Temperature { var celsius: Float = 0.0 var fahrenheit: Float { return (celsius * 1.8) + 32 } }

P.S. In the Question: C is capitalized and the code has a lower class C.