Programming Fundamentals/Function Examples Swift

Temperature

 // This program asks the user for a Fahrenheit temperature, 
 // converts the given temperature to Celsius,
 // and displays the results.
 //
 // References:
 //     https://www.mathsisfun.com/temperature-conversion.html
 //     https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html
 
 func getFahrenheit() -> Double {
     var fahrenheit: Double
     
     print("Enter Fahrenheit temperature:")
     fahrenheit = Double(readLine(strippingNewline: true)!)!
     
     return fahrenheit
 }
 
 func calculateCelsius(fahrenheit: Double) -> Double {
     var celsius: Double
     
     celsius = (fahrenheit - 32) * 5 / 9
     
     return celsius
 }
 
 func displayResult(fahrenheit: Double, celsius: Double) {
     print(String(fahrenheit) + "° Fahrenheit is " + String(celsius) + "° Celsius")
 }
 
 func main() {
     var fahrenheit: Double
     var celsius: Double
     
     fahrenheit = getFahrenheit()
     celsius = calculateCelsius(fahrenheit:fahrenheit)
     displayResult(fahrenheit:fahrenheit, celsius:celsius)
 }
 
 main()

Output

Enter Fahrenheit temperature:
 100
100.0° Fahrenheit is 37.7777777777778° Celsius

References

• Wikiversity: Computer Programming

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