methods ex

5 ЗАДАЧА
import java.util.Scanner;

public class main {
    static String left(int[] arr, int search, int index) {
        String left = "";
        for (int i = 0; i < arr.length - 1; i++) {
            if (index != 0 || index != arr.length - 1) {
                if (arr[index] == arr[index - 1]) {
                    left = "equal";
                } else if (arr[index] > arr[index - 1]) {
                    left = "bigger";
                } else if (arr[index] < arr[index - 1]) {
                    left = "smaller";
                }

                if (index == arr.length - 1) {
                    if (arr[index] == arr[index - 1]) {
                        left = "equal";
                    } else if (arr[index] > arr[index - 1]) {
                        left = "bigger";
                    } else if (arr[index] < arr[index - 1]) {
                        left = "smaller";
                    }
                }
            }
        }
        return left;
    }
    static String right(int[] arr, int search, int index) {
        String right = "";
        for (int i = 0; i < arr.length - 1; i++) {
            if (index != 0 || index != arr.length - 1) {
                if (arr[index] == arr[index + 1]) {
                    right = "equals";
                } else if (arr[index] > arr[index + 1]) {
                    right = "bigger";
                } else if (arr[index] < arr[index + 1]) {
                    right = "smaller";
                }
            }
        }
        if (index == 0) {
            if (arr[index] == arr[index + 1]) {
                right = "equal";
            } else if (arr[index] > arr[index + 1]) {
                right = "bigger";
            } else if (arr[index] < arr[index + 1]) {
                right = "smaller";
            }
        }
        return right;
    }
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] arr = {1, 2, 4, 3, 7, 5};
        int search = scan.nextInt();
        int index = 0;
        for (int i = 0; i < arr.length - 1; i++) {
            if (search == arr[i]) {
                index = i;
            }
        }
        System.out.println(
                "The number is " + right(arr, search, index) +
                        " than its right neighbor");
        System.out.println(
                "and " + left(arr, search, index) +
                        " than its left neighbor");
    }
}
8 ЗАДАЧА
mport java.math.BigInteger;
import java.util.Scanner;

public class main {
    static BigInteger fact(int num) {
        BigInteger sum = new BigInteger(String.valueOf(1));
        for ( int i = 1; i <= num; i++) {
            sum = sum.multiply(BigInteger.valueOf(i));
        }
        return sum;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = Integer.parseInt(scan.nextLine());
        System.out.println(fact(n));
    }
}
9 ЗАДАЧА
  import java.util.Scanner;

public class main {
    static void menu(){
        System.out.println("OPTIONS:");
        System.out.println("1.Reverse a number");
        System.out.println("2.Average");
        System.out.println("3.Solve equation");
    }
    static void reverse(int numberForReverse) {
        int reversed = 0;
        while (numberForReverse != 0) {
            int digits = numberForReverse % 10;
            reversed = reversed * 10 + digits;
            numberForReverse /= 10;
        }
        System.out.println("Reversed number: "+reversed);
    }
    static void average(int[]arr){
        double sum = 0;
        for (int i = 0; i < arr.length; i++) {
            sum+=arr[i];
        }
        sum/=arr.length;
        System.out.println("Average sum: "+sum);
    }
    static void equation(double a, double b){
        double x = -b/a;
        System.out.printf("%.2f * x + %.2f = 0%n",a,b);
        System.out.printf("%.2f * x = %.2f%n",a,-b);
        System.out.printf("x = %.2f / %.2f%n",-b,a);
        System.out.println("x = "+x);
    }
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        menu();
        int option = Integer.parseInt(scan.nextLine());
        if (option == 1) {
            System.out.print("Please enter number: ");
            int numberForReverse = Integer.parseInt(scan.nextLine());
            reverse(numberForReverse);
        }
        if (option == 2) {
            System.out.println("Please enter the elements:");
            String[] input = scan.nextLine().split(" ");
            int [] arr = new int[input.length];
            for (int i = 0; i<input.length;i++){
                arr[i] = Integer.parseInt(input[i]);
            }
            average(arr);
        }
        if (option == 3) {
            System.out.println("Please enter a and b: ");
            double a = scan.nextDouble();
            double b = scan.nextDouble();
            equation(a,b);
        }
    }
}