Stats

gistfile1.txt

package simplestatistics;

import java.util.*;
import java.lang.*;
import java.util.InputMismatchException;

public class SimpleStatistics {

    public static double[] getUserInput(Scanner sc) {

        List<Double> inputList = new ArrayList<Double>();

        System.out.println("Please enter how many numbers you will be inputing");
        int numberOfInputs = sc.nextInt();

        for (int i = 0; i < numberOfInputs; i++) {
            System.out.println("Please enter a number");
            double userInput = sc.nextDouble();
            inputList.add(userInput);
        }
        sc.close();

        double[] arr = new double[inputList.size()];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = inputList.get(i);
        }
        return arr;
    }

    public static double arithmeticMean(double[] nums) {

        double mean = 0;
        double sum = 0;

        for (int i = 0; i < nums.length; i++) {
            sum = sum + nums[i];
        }
        mean = sum / nums.length;

        return mean;
    }

    public static double geometricMean(double[] nums) {

        double gm = 1.0;
        for (int i = 0; i < nums.length; i++) {
            gm *= nums[i];
        }
        gm = Math.pow(gm, 1.0 / (double) nums.length);
        return gm;
    }

    public static double[] minAndmax(double[] nums) {

        double min = nums[0];
        double max = nums[0];

        for (int i = 1; i < nums.length; i++) {
            if (nums[i] < min) {
                min = nums[i];
            } else if (nums[i] > max) {
                max = nums[i];
            } else {

            }
        }

        double[] minAndmax = {min, max};
        return minAndmax;
    }

    public static double[] scaleUp(double[] nums, int factor) {

        for (int i = 0; i < nums.length; i++) {
            nums[i] *= factor;
        }
        return nums;
    }

    public static double[] scaleDown(double[] nums, int factor) {

        for (int i = 0; i < nums.length; i++) {
            nums[i] /= factor;
        }
        return nums;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        double[] input = {1, 2.8, 5.3, 100, -5, -6.5};

        System.out.println("Choose a option 1-6");

        boolean exit = false;
        while (!exit) {
            System.out.println();
            System.out.println("1) Arithmetic mean, 2) Geometric mean, 3)  minAndmax, 4)  Scale Up, 5)  Scale Down, 6)  Quit");
            System.out.print("Input -> ");
            int choice = sc.nextInt();
            System.out.println();

            switch (choice) {
                case 1: {
                    // Arithmetic mean
                    System.out.println("Arithmetic mean");
                    System.out.println(arithmeticMean(getUserInput(sc)));
                    break;
                }
                case 2: {
                    // Geometric mean
                    System.out.println("Geometric mean");
                    System.out.println(arithmeticMean(getUserInput(sc)));
                    break;
                }
                case 3: {
                    // Min and max
                    System.out.println("Min and Max");
                    for (double i : minAndmax(getUserInput(sc))) {
                        System.out.print(i + ", ");
                    }
                    break;
                }
                case 4: {
                    // Scale Up
                    System.out.println("Scale Up");
                    System.out.print("Please enter factor by which you want to scale -> ");
                    int factor = sc.nextInt();
                    for (double i : scaleUp(input, factor)) {
                        System.out.print(i + ", ");
                    }
                    break;
                }

                case 5: {
                    // Scale Down
                    System.out.println("Scale Down");
                    System.out.print("Please enter factor by which you want to scale -> ");
                    int factor = sc.nextInt();
                    for (double i : scaleDown(input, factor)) {
                        System.out.print(i + ", ");
                    }
                    break;
                }

                case 6: {
                    exit = true;
                    break;
                }

            }
        }
    }
}