# Solved: Convert Kelvin into Celsius

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Converting temperature scales is a common requirement in the field of Science and Engineering. One frequent conversion is from Kelvin to Celsius, units of measurement used to gauge heat or cold in a system. In this article, with the help of Swift programming language, we will create a simple yet effective temperature converter.

```func KelvinToCelsius(Kelvin : Double) -> Double {
return Kelvin - 273.15
}
```

This Swift function takes one argument – the temperature in Kelvin, and returns the temperature converted to Celsius by subtracting 273.15 from the Kelvin temperature.

Swift programming language highlights simplicity and straightforward syntax, and this function is a great representation of these attributes. Note that it receives a Double argument and returns a Double. This is because temperatures can be decimal, and therefore Double data type is more suitable in this scenario.

## The Swift Function Explained

The above function is a standard Swift function. The keyword func starts the declaration of a function. This is followed by the name of the function (KelvinToCelsius) and parameters it takes in parentheses.

```func KelvinToCelsius(Kelvin : Double)
```

The ‘->’ symbol denotes that this function returns a value, and the type of that value is specified thereafter. In this case it is Double.

The actual body of the function is enclosed in curly braces {}. The logic to convert Kelvin to Celsius is implemented inside these braces.

## Utilizing Libraries or Functions

No additional libraries or special functions were required to write this function. Swift provides all necessary tools to complete this task within its core language syntax.

However, Swift does offer various numerical libraries (like Foundation< /b> and CoreML) which are vital for complex mathematical operations or machine learning algorithms. Even though these are not required for our task, they demonstrate Swift’s capability in handling diverse computational requirements.

## Running the Function

To run the function and see the conversion in action, you simply call the function with a Kelvin value. Below is an example:

```print(KelvinToCelsius(Kelvin: 300))
```

You can see this prints the equivalent Celsius temperature for 300 Kelvin.

## Understanding Double Data Type

In our function, we used the Double data type. It is a floating point number, meaning it can deal with numbers with decimal points, making it ideal for temperature conversions. This Double data type can handle decimal values very efficiently, which is precisely why it was used in this temperature converter function.

To sum it up, with just a few lines of code, Swift allows for simple and effective solutions to many mathematical problems, including converting temperatures from Kelvin to Celsius. It’s the simplicity, combined with power, which makes Swift a highly sought-after programming language.

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