Java Program to implement Packages

//file 1


//filename: myMath.java



package myPackage;



public class myMath

{

 public static double power(double x, double y)

 {

  if(y == 0)

   return 1;

  else

   return(x * power(x, y-1));

 }



 public static double fact(double n)

 {

  if(n == 0)

   return 1;

  else

   return(n * fact(n-1));

 }

}



//file 2

//filename: Exp09.java



import myPackage.*;

import java.util.*;



class Exp09

{

 Scanner sc = new Scanner(System.in);

 static double calculateSeries()

 {

  Scanner sc = new Scanner(System.in);

  System.out.println("Enter the number of terms ");

  int n = sc.nextInt();

  double ans = 1;

  int sign = -1;

  System.out.println("Enter the value of x ");

  double x = sc.nextInt();

  x = 3.142 * x / 180;

  for(int i = 2; i < 2 * n; i = i + 2)

  {

   ans = ans + sign * ( myMath.power(x, i) / myMath.fact(i) );

   sign = -sign;

  }

  return ans;

 }



 public static void main(String[] args)

 {

  double ans = calculateSeries();

  System.out.println("The answer is " + ans);

 }

}



/* OUTPUT

 *

 *Enter the number of terms

5

Enter the value of x

45

The answer is 0.7070347926963395 */