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Thread: cos(x) program

  1. #1
    Junior Member
    Join Date
    Nov 2013
    Thanked 0 Times in 0 Posts

    Question cos(x) program

    I cannot figure out what I did wrong with this code to calculate cos(x), the function for the program is attached!

    package cosx;

    import java.util.Scanner;

    public class cosx {
    public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    System.out.print("Enter amount in degrees: ");
    double degrees = input.nextDouble();
    System.out.print("Enter the number of series: ");
    int n = input.nextInt();

    System.out.println(getCos(degrees, n));
    System.out.println(Math.cos(convertToRadians(degre es)));

    public static double getCos(double degrees, int n) {
    double cos = 0;
    double numerator = 0;
    int denominator = 0;
    for (int i = 0; i <= n; i++, i++) {
    numerator = getNumerator(Math.pow(-1, i));
    denominator = getFactorial(2 * i);
    cos += numerator / denominator;
    return cos;

    public static double convertToRadians(double degrees) {
    return degrees * Math.PI / 180;

    public static int getFactorial(int n) {
    int factorial = 1;
    for (int i = 1; i <= n; i++) {
    factorial *= i;
    return factorial;

    public static double getNumerator(double degrees, int n) {
    return convertToRadians(degrees) * Math.pow(-1, n);

    Attached Images Attached Images

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,273 Times in 2,244 Posts

    Default Re: cos(x) program

    what I did wrong with this code
    Please explain.

    Attachment image too small.

    Please edit your post and wrap your code with code tags:
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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