Question

Implement the following integer methods:

Answer 1

Answer:

1. import java.util.Scanner;
3. public class Main {
4.    public static void main(String[] args) {
5.        Scanner input = new Scanner(System.in);
6.        System.out.print("Choose an option 1) Convert Fahrenheit to Celcius  2) Convert Celcius to Fahrenheit: ");
7.        int option = input.nextInt();
9.        if(option == 1){
10.            System.out.print("Please enter a temperature in Fahrenheit: ");
11.            double fahrenheit = input.nextDouble();
12.            System.out.println("The equavalent Celcius is: " + Celsius(fahrenheit));
13.        }
14.        else if(option == 2){
15.            System.out.print("Please enter a temperature in Celcius: ");
16.            double celcius = input.nextDouble();
17.            System.out.println("The equavalent Fahrenheit is: " + Fahrenheit(celcius));
18.        }
19.        else{
20.            System.out.println("Invalid option.");
21.        }
22.    }
24.    public static double Celsius(double fahrenheit){
25.        return 5.0/ 9.0 * (fahrenheit - 32);
26.    }
28.    public static double Fahrenheit(double celcius){
29.        return 9.0 / 5.0 * (celcius + 32);
30.    }
31. }

Explanation:

Firstly, import the Scanner class as we need to prompt user to choose an option to display the temperature value (Line 1).

Next we create a method Celcius that will take one input fahrenheit and then apply the formula to calculate and return the equivalent Celsius (Line 24 - 26).

Create another method Fahrenheit that will take one input celcius and then apply the formula to calculate and return the equivalent Fahrenheit (Line 28 - 30).

In the main program, use the scanner object to get user input the option to display temperature value (Line 5- 7).

Create an in-else-if block and check if the option is one, get an input Fahrenheit from user and call the Celsius method to display the equivalent temperature in Celsius (Line 9 -13).

If the option is two, get an input Celsius from user and call the Fahrenheit method to display the equivalent temperature in Fahrenheit (Line 14 -18).

If the input option is other than 1 or 2, display an error message (Line 19 - 21)