import java.util.*;
import java.lang.*;
/**
 * Write a description of class Calculator here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class MathMethods

{
    private static int displayModeCounter=4;

    public static Double add(double n1, double n2){
        return (n1 + n2);
    }

    public static Double subtract(double n1, double n2){
        return (n1 - n2);
    }

    public static Double multiply(double n1, double n2){
        return (n1 * n2);
    }

    public static Double divide(double n1, double n2){
        return (n1 / n2);
    }

    public static Double exponent(double n1, double n2){
        return (Math.pow(n1, n2));
    }

    public static Double cosine(double n1){
        return (Math.cos(n1));
    }

    public static Double invCosine(double n1){
        return (Math.acos(n1));
    }

    public static double squareRoot(double n1) {
        return (Math.sqrt(n1));

    }

    public static double invert(double n1) {
        return (n1*-1);

    }

    public static double sin(double n1){
        return (Math.sin(n1));

    }

    public static double iSin(double n1){
        return (Math.asin(n1));

    }

    public static double degToRad(double n1) {
        return (Math.toRadians(n1));

    }

    public static double radToDeg(double n1) {
        return (Math.toDegrees(n1));

    }

    public static String fortuneCookie() {
        Random rand = new Random();
        String[] wiseWords = new String[] {"You're a hard worker and you will do great on all the labs!", 
                "Look how much java you learned this week! That's awesome!", 
                "Keep up the good work!" ,
                "You're cushing it!", "You're a coding rockstar!", 
                "Keep coding!"};  
        int arrIndex = rand.nextInt(6);
        return wiseWords[arrIndex];
    }

    public static double square(double n1) {
        return Math.pow(n1, 2);
    }

    public static String switchDisplayMode(String mode){

        Calculator display = new Calculator();
        String answer = "";
        switch (mode) {
            case "binary":
            answer = "0b " + Integer.toBinaryString((int)display.lastAns);
            break;

            case "octal":
            answer = "0 " + Integer.toOctalString((int)display.lastAns);
            break;

            case "decimal":
            answer = String.valueOf(display.lastAns);
            break;

            case "hexadecimal":
            answer = "0x " + Integer.toHexString((int)display.lastAns);
            break;

        }
        return answer;
    }

    public String switchDisplayMode(){
        String answer = "";
        if (displayModeCounter%4 == 0){ 
            answer = switchDisplayMode("binary");
            displayModeCounter++;
        } 
        else if (displayModeCounter%4 == 1){
            answer = switchDisplayMode("octal");
            displayModeCounter++;
        } 
        else if (displayModeCounter%4 == 2) {
            answer = switchDisplayMode("hexadecimal");
            displayModeCounter++;
        } else {
            answer = switchDisplayMode("decimal");
            displayModeCounter++;
        }
        return answer;
    }

    public static double randomNumber() {
        Random rand = new Random();
        return rand.nextDouble()*101;

    }

    public static void printAns(String printAnswer){
        System.out.println("ANSWER: " + printAnswer + "\n \n");
    }

    public static double inverse(double n1) {
        return 1 / n1;
    }

    public static double tangent(double n1) {
        return Math.tan(n1);
    }

    public static double iTan(double n1) {
        return Math.atan(n1);
    }

    public static double state() {
        Calculator display = new Calculator();
        return (display.lastAns);
    }

}