Java Math Answers

package IntroductionToJava.Exercises;

import java.util.Scanner;

public class MathWithMethods {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("To reverse the order of the digits press 1.");
        System.out.println("To sum the average press 2.");
        System.out.println("To solve an equation press 3.");


        int choice = input.nextInt();
        if (choice == 1) {
            System.out.print("Write down the number: ");
            int number = input.nextInt();
            System.out.println(reverseDigits(number));
        }
        else if (choice == 2) {
            System.out.println("How many numbers do you want to find the average of?");
            int number = input.nextInt();
            System.out.println(findAverage(number));
        }
        else if (choice == 3) {
            System.out.println("Enter \"a\" and \"b\" to find the answer of a * x + b = 0");
            int a = input.nextInt();
            int b = input.nextInt();

        }
    }
    public static int reverseDigits(int number) {
        int c = number % 10;
        number /= 10;
        int b = number % 10;
        number /= 10;
        int a = number % 10;

        System.out.print(c);
        System.out.print(b);
        return a;

    }
    public static int findAverage(int number) {
        Scanner input = new Scanner(System.in);

        int[] numbers = new int[number];
        int totalSum = 0;

        for (int i = 0; i < number; i++) {
            System.out.print("Please insert the next number: ");
            numbers[i] = input.nextInt();
        }

        for (int i : numbers) {
            totalSum += i;
        }

        System.out.print("The average is: ");
        return totalSum / number;
    }
    public static int solveEquation(int a, int b) {
        System.out.println(a + " * x + " + b + " = 0");
        System.out.println("x = b / a");
        int x = b / a;
        System.out.println("The answer is: ");
        return x;
    }

}