Midterm Project - Christopher Turner - Flintridge Preparatory School

TempNthRoot.java

// Written by Christopher Turner.-
import java.util.*;
public class NthRoot {
    public static void main(String[] args) {
        Calculator rootFinder = new Calculator();
        double radical = (double) rootFinder.getRadical();
        int n = rootFinder.getN();
        int requestedError = rootFinder.getRequestedError();
        double xtoN = radical; //Creates a variable for the final result, initially setting it equal to the input
        double calculatedError = Math.pow(10, -(requestedError)); //Applies the base to the variable exponent to get the maximum allowed degree error
        double technicalResult = Math.pow(radical, (double) 1.0 / requestedError);
        while (Math.abs(technicalResult - xtoN) > calculatedError) { //Runs while the current error is greater than the allowed error
            xtoN = xtoN - ((Math.pow(xtoN,n) - radical) / (n * Math.pow(xtoN,n-1))); //Calculates the iterative result
        }
        System.out.print("Your result is: "); //Output
        System.out.printf("%." + requestedError + "f", xtoN); //Output
    }
}
public class Calculator {
    Scanner input = new Scanner(System.in);
    int radical = -1; //Initializes a variable for the number a user would like to find the root of
    int n = -1; //Initializes a variable for the number a user would like to find the root of
    int requestedError = -1; //Initiatizes a variable for the number of decimal places a result will be accurate to
    public int getRadical() {
        System.out.println("Please enter a number to find the root of:"); //Output
        while (radical < 1 || radical > 1000) { //Restricts calculuations to between 1 and 1000.
            while (input.hasNextInt() == false) { //Runs while the input doesn't include an integer
                input.nextLine(); //Advances to next line
            }
            radical = input.nextInt(); //Assigns the radical variable to user input
            if (radical < 1 || radical > 1000) { //Asks for new input if not within specified range
                System.out.println("Please enter a number between 1 and 1,000:"); //Output
            }
        }
        return radical;
    }
    public int getN() {
        System.out.println("Please enter n for the nth root:"); //Output
        while (n < 1 || n > 1000) { //Restricts calculuations to between 1 and 1000.
            while (input.hasNextInt() == false) { //Runs while the input doesn't include an integer
                input.nextLine(); //Advances to next line
            }
            n = input.nextInt(); //Assigns the radical variable to user input
            if (n < 1 || n > 1000) { //Asks for new input if not within specified range
                System.out.println("Please enter a number between 1 and 1,000:"); //Output
            }
        }
        return n;
    }
    public int getRequestedError() {
        System.out.println("Please enter your error tolerance:"); //Ouput
        while (requestedError < 3 || requestedError > 14) { //Restricts range of calculations
            while (input.hasNextInt() == false) { //Runs while the input doesn't include an integer
                input.nextLine(); //Advances to next line
            }
            requestedError = input.nextInt(); //Assigns the radical variable to user input
            if (requestedError < 3 || requestedError > 14) { //Asks for new input if not within specified range
                System.out.println("Please enter an error tolerance between 3 and 14:"); //Output
            }
        }
        return requestedError;
    }
}