CSC-111 Sin Calculation Prototype Code

SineApp.java

/*
 * Name: Tony Silvestri
 * Date: 11/4/2019
 * Course Number: CSC-111
 * Course Name: Intro to Java
 * Problem Number: HW7
 * Email: silvestri@stcc.edu
 * Description:  HW7 Calculate Sine Function Using Series
 */

import java.util.Scanner;

public class SineApplication {
	private final static String TITLE = "Sine Application";
	private final static String CONTINUE_PROMPT = "Do this again? [y/N] ";

	// **********************************************
	// Put as many methods you need here
	
	private static double power(double x, int exp) {
		double result;
		result = 1.0;
		for (int i = 1; i <= exp; i++)
			result *= x;
		return result;
	}

	private static double factorial(int n) {
		double result = 1.0;
		for (int i = 1; i <= n; i++)
			result *= i;
		return result;
	}

	private static double sin(double x, int noOfTerms) {
		double xinRads = x * Math.PI / 180.0;
		double sum = 0.0;
		int n = 1;
		for (int i = 0; i < noOfTerms; i++) {
			double num = power(xinRads, n);
			double den = factorial(n);
			double term = num / den;
			int sign = i % 2 == 0 ? 1 : -1;
  		    sum += sign * term;
			n += 2;
		}
		return sum;
	}
	
	private static void outputResults(double x, double ans, int noOfTerms) {
		System.out.printf("Number of Terms: %d\n", noOfTerms);
		System.out.printf("Calculated sin(%f) = %.6f\n", x, ans);
		System.out.printf("Real Math  sin(%f) = %.6f\n", x, Math.sin(Math.toRadians(x)));
		System.out.printf("Difference = %.6f\n", Math.sin(Math.toRadians(x)) - ans);
	}

	// **********************************************
	// Start your logic coding in the process method
	private static void process(Scanner sc, String args[]) {
		System.out.print("Enter x in degrees: ");
		double x = sc.nextDouble();
		System.out.print("Number of Terms: ");
		int noOfTerms = sc.nextInt();
		sc.nextLine();
		double ans = sin(x, noOfTerms);
		outputResults(x, ans, noOfTerms);
	}

	// **********************************************
	// Do not change the doThisAgain method
	private static boolean doThisAgain(Scanner sc, String prompt) {
		System.out.print(prompt);
		String doOver = sc.nextLine();
		return doOver.trim().equalsIgnoreCase("Y");
	}

	// **********************************************
	// Do not change the main method
	public static void main(String args[]) {
		System.out.println("Welcome to " + TITLE);
		Scanner sc = new Scanner(System.in);
		do {
			process(sc, args);
		} while (doThisAgain(sc, CONTINUE_PROMPT));
		sc.close();
		System.out.println("Thank you for using " + TITLE);
	}

}