Revise paste LABA 1 KSIPO

package com.company;

import java.util.Scanner;

public class Main
{

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

while(true){

String check = in.nextLine();

switch(check){
                case"1":
                    ex1();
                    break;
                case"2":
                    ex2();
                    break;
                case"3":
                    ex3();
                    break;
                case"4":
                    ex4();
                    break;
                case"5":
                    ex5();
                    break;
                case"6":
                    ex6();
                    break;
                case"exit":
                    return;

}
        }
    }
    public static void ex1()
    {

Scanner in  = new Scanner(System.in);

int count = in.nextInt();

double[] array = new double[count];

for(int i = 0; i < count; i++)
        {
            array[i] = Math.random();
            System.out.println(array[i]);
        }

double max = array[0];
        double min = array[0];
        double center = 0;
        for(int i = 0; i < count; i++)
        {
            if(max < array[i])
            {
                max = array[i];
            }
            if(min > array[i])
            {
                min = array[i];
            }
            center += array[i];
        }
        center = center/array.length;
        System.out.println("MAX: " + max);
        System.out.println("MIN: " + min);
        System.out.println("CENTER: " + center);
    }
    public static void ex2()
    {

Scanner in  = new Scanner(System.in);

int count = 13;
        int x = 0;
        while(count > 12 || count < 1)
        {
            if (x > 0 && count > 12)
                System.out.print("You entered too much value");
            else if (x > 0 && count < 1)
                System.out.print("You entered too small a value");
            ++x;

try{
                count = in.nextInt();
            }
            catch (Exception e){
                System.out.println("You entered an invalid value " + e.getMessage());
                return;
            }
        }

if(count > 11 || count < 3)
        {
            System.out.print("Winter");
        }
        else if(count > 2 || count < 6)
        {
            System.out.print("Spring");
        }
        else if(count > 5 || count < 9)
        {
            System.out.print("Summer");
        }
        else if(count > 8 || count < 12)
        {
            System.out.print("Autumn");
        }
    }
    public static void ex3()
    {
        Scanner in  = new Scanner(System.in);

double number = in.nextInt();

while(number != 2)
        {
            System.out.println(number);
            number = number/2;
            if (number < 2)
            {
                break;
            }
        }
        if (number == 2)
        {
            System.out.print("YES");
        }
        else if (number != 2)
        {
            System.out.print("NO");
        }
        System.out.print(number);
    }
    public static void ex4()
    {
        Scanner in  = new Scanner(System.in);

int num = in.nextInt();
        int factorial = 1;

for(int i = 1; i < num+1; i++)
        {
            factorial *= i;
        }
        System.out.print(factorial);

}
    public static void ex5()
    {
        Scanner in  = new Scanner(System.in);

int number = in.nextInt();
        int num = number;
        char[] c_array = new  char[4];
        int x = 1;

while(x < 12 && num < 9000)
        {
            num++;
            String s_num = Integer.toString(num);

for(int i = 0; i < 4; i++)
            {
                c_array[i] = s_num.charAt(i);
                //System.out.print(c_array[i]);
            }
            for(int i = 0; i < 4; i++)
            {
                for(int j = 0; j < 4; j++)
                {
                    if(i == j)
                    {

}
                    else if(c_array[i] != c_array[j])
                    {
                        ++x;
                    }
                    else
                    {
                        x = 1;
                        continue;
                    }
                }
            }
        }
        System.out.print(num);
    }
    public static void ex6()
    {
        int n1 = 1;
        int n2 = 1;
        int n3 = 1;

System.out.print(n1+" "+" "+n2+" ");
        for(int i = 0; i < 9; i++)
        {
            n3 = n1+n2;
            System.out.print(n3+" ");
            n1 = n2;
            n2 = n3;
        }
    }
}