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  1. import java.util.Scanner;
  2. import java.util.Arrays;
  3. public class BigProject1 {
  4.  
  5. //method to print the array delimited by spaces
  6.     public static int[] print(int[] arr) {
  7.         for(int i=0; i<arr.length; i++) {
  8.             System.out.print(arr[i]+ " ");
  9.         }
  10.         return arr;
  11.     }
  12. //method to sort the array
  13.     public static int[] sorted(int[] arr2) {
  14.         for(int o=0; o<arr2.length; o++) {
  15.             Arrays.sort(arr2);
  16.         }
  17.         return arr2;
  18.     }
  19. //method to count the number of different elements in the array
  20.     public static int different(int[] arr3) {
  21.         if(arr3.length==0) {
  22.             return 0;
  23.         }
  24.         int counter=1;
  25.         for(int x=1; x<arr3.length; x++) {
  26.             if(arr3[x]!=arr3[x-1]) {
  27.                 counter++;
  28.             }
  29.         }
  30.         return counter;
  31.     }
  32.     /*public static int[] pals(int[] arr4){
  33.         int count2=0;
  34.         for(int i=0; i<arr4.length; i++) {
  35.             int n= arr4[i];
  36.             int rev=0;
  37.             int tmp=0;
  38.             while(n>0) {
  39.                 tmp=n%10;
  40.                 n=n/10;
  41.                 rev=rev*10+tmp;
  42.             }
  43.        
  44.             if(arr4[i]==rev) {
  45.                 count2++;
  46.             }
  47.             else {
  48.                 System.out.print("");
  49.             }
  50.         }
  51.         return arr4;
  52.     }*/
  53.  
  54.     public static void main(String[] args) {
  55. /*prompts user for the length of their array, initializes an array with that
  56.  * length, loops through all the elements the user inputs, and stores every
  57.  * element in the array, then calling the print method to print the array
  58.  */
  59.         Scanner scan= new Scanner(System.in);
  60.         System.out.print("Enter the length of the array: ");
  61.             int len= scan.nextInt();
  62.         int[] arr= new int[len];
  63.             for(int i=0; i<arr.length; i++) {
  64.                 arr[i]=scan.nextInt();
  65.             }
  66.  
  67.         print(arr);
  68. //printing the length of the array again for the first objective
  69.         System.out.println("\nNumber of elements:"+arr.length);
  70. /*initializing a variable at position 0 of the array, loops through all the
  71.  * elements of the array, finds the largest element and prints it
  72.  */
  73.         int max1=arr[0];
  74.             for (int j=0; j<len; j++) {
  75.                 if (max1 < arr[j]) {
  76.                     max1 = arr[j];
  77.                 }
  78.             }
  79.         System.out.println("Largest number: " +max1);
  80. //calling the print and sort methods to print the sorted array
  81.         print(sorted(arr));
  82. /*Initializing two variables,looping through all elements of the array using
  83.  *if statements to check which value is the smallest and which is the
  84.  *second smallest and printing the second smallest element
  85.  */
  86.         int min=Integer.MAX_VALUE;
  87.         int min2=Integer.MAX_VALUE;
  88.             for(int k=0; k<arr.length; k++) {
  89.                 if(arr[k]==min) {
  90.                     min2=min;
  91.                 }
  92.                 if(arr[k]<min) {
  93.                     min2=min;
  94.                     min=arr[k];
  95.                 }
  96.                 else if(arr[k]<min2) {
  97.                     min2=arr[k];
  98.                 }
  99.             }
  100.         //System.out.print("\nSmallest number:"+min);
  101.         System.out.print("\nSecond smallest number: "+min2);
  102. //counting all even numbers and printing that number
  103.             int count=0;
  104.             for(int l=0; l<arr.length; l++) {
  105.                 if(arr[l]%2==0) {
  106.                     count++;
  107.                 }
  108.             }
  109.         System.out.println("\nNumber of evens: "+count);
  110. //counting all odd numbers and printing that number
  111.         int count1=0;
  112.             for(int m=0; m<arr.length; m++) {
  113.                 if(arr[m]%2!=0) {
  114.                     count1++;
  115.                 }
  116.             }
  117.         System.out.println("Number of odds: "+count1);
  118. /*initializing a variable with 0, looping through the elements in the array
  119.  * setting the variable to be itself plus the element in each position of
  120.  * array, printing the sum of all elements
  121.  */
  122.         int sum=0;
  123.             for(int q=0; q<arr.length; q++) {
  124.                 sum=sum+arr[q];
  125.             }
  126.         System.out.println("Sum of all numbers: "+sum);
  127.  
  128. /*reversing the numbers in the array and comparing the original number
  129.  * with the reversed one, printing the number of numbers with equal
  130.  * reversed and original forms
  131.  */
  132.         int[] palarr=new int[len];
  133.         int index=0;
  134.         int count2=0;
  135.         for(int i=0; i<arr.length; i++) {  
  136.             int n= arr[i];
  137.             int rev=0;
  138.             int tmp=0;
  139.         while(n>0) {
  140.             tmp=n%10;
  141.             n=n/10;
  142.             rev=rev*10+tmp;
  143.         }
  144.         if(arr[i]==rev) {
  145.             count2++;
  146.             arr[i]=palarr[index];
  147.             index++;
  148.         }
  149.         else {
  150.             System.out.print("");
  151.         }
  152.     }
  153. print(palarr);
  154.         System.out.println("\nNumber of palindromic numbers: "+count2);
  155. //calling the method that finds the number of different elements and printing
  156.         System.out.println("Number of different elements: "+different(arr));
  157.  
  158.         /*int count3=1;
  159.         for(int x=1; x<arr.length; x++) {
  160.             if(arr[x]==arr[x-1]){
  161.                 count3++;
  162.                 //System.out.print("Frequency of: "+arr[x]+"is"+count3/arr.length*100+"%");
  163.                 System.out.println(count3);
  164.             }
  165.         }*/
  166.        
  167. //printing average of all elements by taking the sum and dividing by the length
  168.         System.out.println("Average of all numbers: "+sum/len);
  169.  
  170.        
  171.     }
  172. }
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