27.4.7: Swift Examples
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// 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()
Enter Fahrenheit temperature: 100 100.0° Fahrenheit is 37.7777777777778° Celsius