Programming Fundamentals/Functions/Java

functions.java

// 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://en.wikibooks.org/wiki/Java_Programming

import java.util.*;

class Main {
    private static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        double fahrenheit;
        double celsius;
        
        fahrenheit = getFahrenheit();
        celsius = calculateCelsius(fahrenheit);
        displayResult(fahrenheit, celsius);
    }

    private static double getFahrenheit() {
        double fahrenheit;
        
        System.out.println("Enter Fahrenheit temperature:");
        fahrenheit = input.nextDouble();
        
        return fahrenheit;
    }

    private static double calculateCelsius(double fahrenheit) {
        double celsius;
        
        celsius = (fahrenheit - 32) * 5 / 9;
        
        return celsius;
    }

    private static void displayResult(double fahrenheit, double celsius) {
        System.out.println(fahrenheit + "° Fahrenheit is " + 
            celsius + "° Celsius");
    }
}

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functions.java

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