ZCW-MacroLabs-OOP-ScientificCalculator/Scientific.java

import java.math.BigInteger;

public class Scientific
{
    // instance variables - replace the example below with your own
    private int x;

    /**
     * Constructor for objects of class Scientific
     */
    public Scientific()
    {
        // initialise instance variables
        x = 0;
    }

    public static double sine(double angle, int mode)
    {
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.sin(angle) ;
    }

    public static double cosine(double angle, int mode)
    {
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.cos(angle) ;
    }

    public static double tangent(double angle, int mode)
    {
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.tan(angle) ;
    }

    public static double inverseSin(double angle, int mode)
    {   
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.asin(angle) ;
    }

    public static double inverseCosine(double angle, int mode)
    {
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.acos(angle) ;
    }

    public static double inverseTangent(double angle, int mode)
    {
        if (mode == 0) {
            angle = Math.toRadians(angle);
        }
        return Math.atan(angle) ;
    }

    public static BigInteger factorial(double x)
    {
        int y = (int) x;
        BigInteger factorialValue = BigInteger.valueOf(1);
        for (int i=1; i<=y; i++) {
            factorialValue = factorialValue.multiply(BigInteger.valueOf(i));
        }
        return factorialValue;
    }

}