Question

Create an application named ConvertMilesToKilometers whose Main() method prompts a user for a number of miles, passes the value to a method that converts the value to kilometers, and then returns the value to the Main() method where it is displayed. A mile is 1.60934 kilometers.

Answer 1

The solution codes are written in Java as follows:

1. import java.util.Scanner;
3. public class ConvertMilesToKilometers {
5. public static double convert_to_km(double miles)
6. {
7. double km = miles * 1.60934;
9. return km;
10. }
12. public static void main(String[] args) {
14. System.out.print("Enter miles: ");
15. Scanner input = new Scanner(System.in);
16. double inputMiles = input.nextDouble();
18. System.out.println(inputMiles + " mile(s) = " + convert_to_km(inputMiles) + " km");
19. }
20. }

Step-by-step explanation:

Line 1 (Import Java Scanner Class)

• Since the application is expected to get an input miles from user, the Java Scanner class is needed.
• The Java Scanner class will be required to create a Scanner object to get input from user (Line 15).

Line 5 -10 (Create a method to convert mile to km)

• This method accept one input (miles) and convert it to km.
• km is returned as the output.

Line 14-16 (Get user input for miles )

• A Scanner object is created in Line 15.
• To get user input for miles, the nextDouble() method of the Scanner object is used (Line 16).
• The nextDouble() is a method dedicated to get a decimal number as input (since miles is often in decimal format rather than an integer).

Line 18 (call method to convert miles to km and display the output)

• Call convert_to_km() method by passing the user input miles (inputMiles) as argument.
• The method will convert the miles to km and return output to the main method and display it in terminal using println() method.