/**
 * Write a description of class calculatorCoreFunctions here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
import java.lang.*;
import java.util.*;
public class calculatorCoreFunctions
{
    // instance variables - replace the example below with your own

    /**
     * Write a description of class calculatorCoreFunctions here.
     *
     * @author (your name)
     * @version (a version number or a date)
     */

    public calculatorCoreFunctions()
    {
        // initialise instance variables
        double x = 0;
        double y = 0;
    }

    /**
     * An example of a method - replace this comment with your own
     *
     * @param  y  a sample parameter for a method
     * @return    the sum of x and y
     */
    public double add(double x, double y)
    {
        // put your code here
        return x + y;
    }

    public double subtract(double x, double y)
    {
        return x - y;
    }

    public double multiply(double x, double y)
    {
        return x * y;
    }

    public double divide(double x, double y)
    {
        if (y == 0)
        {
            System.out.println("Invalid input");
            return 0;
        }
        return x / y;
    }

    public double sqrt(double x)
    {
        return Math.sqrt(x);
    }

    public double exponent(double x, double y)
    {
        return Math.pow(x, y);
    }

    public double inverse(double x)
    {
        if (x ==0){
            return 0;
        }
        return 1 / x;
    }
}