ZCW-MacroLabs-OOP-ScientificCalculator/Calculator.java

/**
 *
 * Allison & Alfredo
 * 5/25/2018
 * 
 */


public class Calculator
{
    private double displayValue;
    private double memoryValue;

    /**
     * Constructor for objects of class Calculator
     */
    public Calculator()
    {
        displayValue = 0;
        memoryValue = 0;
    }

    //Memory set
    public double memSet(){
        memoryValue = displayValue;
        return memoryValue;
    }

    public double memClear(){
        memoryValue = 0;
        return memoryValue;
    }

    public double mrc(){
        displayValue = memoryValue;
        return displayValue;
    }

    public double getMem() {
        return memoryValue;
    }

    //Clear and retrieve display value
    public double clear(){
        displayValue = 0;
        return displayValue;
    }

    public double setDisplayValue(double value){
        displayValue = value;
        return displayValue;
    }

    public double getDisplayValue(){
        return displayValue;
    }

    //basic functions
    public double add(double value){
        displayValue += value;
        return displayValue;
    }

    public double subtract(double value){
        displayValue -= value;
        return displayValue;
    }

    public double multiply(double value){
        displayValue *= value;
        return displayValue;
    }

    public double divide(double divisor){
        displayValue = displayValue / divisor;
        return displayValue;
    }

    public double pow(double exponent){
        displayValue = Math.pow(displayValue, exponent);
        return displayValue;
    }

    public double square(){
        return pow(2);
    }

    public double squareRoot(){
        displayValue = Math.sqrt(displayValue);
        return displayValue;
    }

    public double inverse(){
        displayValue = 1 / displayValue;
        return displayValue;
    }

    public double changeSign(){
        return multiply(-1);
    }

    //scientific functions
    public double sin(double val){
        displayValue = Math.sin(val);
        return displayValue;
    }

    public double cos(double val) {
        displayValue = Math.cos(val);
        return displayValue;
    }

    public double tan(double val) {
        displayValue = Math.tan(val);
        return displayValue;
    }

    public double inverseSin(double val) {
        displayValue = Math.asin(val);
        return displayValue;
    }

    public double inverseCos(double val) {
        displayValue = Math.acos(val);
        return displayValue;
    }

    public double inverseTan(double val) {
        displayValue = Math.atan(val);
        return displayValue;
    }
    
    //Bonus Functions
    public double log() {
        displayValue = Math.log(displayValue);
        return displayValue;
    }

    public double inverseLog(){
        displayValue = Math.pow(displayValue, 10);
        return displayValue;
    }

    public double naturalLog() {
        displayValue = Math.log1p(displayValue);
        return displayValue;
    }

    public double inverseLn() {
        displayValue = Math.pow(Math.E, displayValue);
        return displayValue;
    }
    
    public double factorial() {
        displayValue = (int) displayValue;
        double d = displayValue;
        for (int i = 1; i < d; i++) {
            displayValue = displayValue*i;
        }
        return displayValue;
    }

    //Custom functions
    public double displayPi() {
        displayValue = Math.PI;
        return displayValue;
    }

    public double displayE(){
        displayValue = Math.E;
        return Math.E;
    }

}