WorkCalculator.java

import java.util.Scanner;

public class WorkCalculator {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("CALCULATE WORK OF AN OBJECT LIFTED - IN UNITED STATES SYSTEM OR SYSTEME INTERNATIONAL.");
		System.out.print("Enter the number of calculations you would like to do: ");
		int iterations = scan.nextInt();
		for(int i = 0; i < iterations; i++) {
			line();
			System.out.print("Enter 1 to use US System, or 2 to use SI system: ");
			int systemChoice = scan.nextInt();
			line();
			if(systemChoice == 2) {
				siSystem();
			}
			if(systemChoice == 1) {
				usSystem();
			}
		}
		System.out.println("\nThank you for calculating with Ethan.");
	}
	public static void siSystem() {
		Scanner scan = new Scanner(System.in);
		System.out.println("To calculate work (W) of an object lifted, we need to multiply the force by distance.");
		System.out.print("Enter the distance the object is lifted in meters: ");
		double distance = scan.nextDouble();
		//System.out.println("Now we need to calculate force.");
		System.out.print("Enter the mass of the object lifted in kilograms: ");
		double mass = scan.nextDouble();
		final double gravity = 9.8;
		double force = mass * gravity;
		System.out.println("Force = " + force + " Newtons");
		double work = force * distance;
		System.out.println("Work = " + work + " Joules");
	}
	// example: 10kg lifted 1.3 meters ---> F = 98 N, W = 127.4 J

	public static void usSystem() {
		Scanner scan = new Scanner(System.in);
		System.out.println("To calculate work (W) of an object lifted, we need to multiply the force by distance.");
		System.out.print("Enter the distance the object is lifted in feet: ");
		double distance = scan.nextDouble();
		System.out.print("Enter the force of the object lifted in lbs (pounds): ");
		double force = scan.nextDouble();
		double work = force * distance;
		System.out.println("Work = " + work + " ft-lbs");
	}
	// example: 22 lb lifted 4.26 feet ---> 93.72 ft-lbs
	public static void line() {
		System.out.println("--------------------------------------------------");
	}
}