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curious-vasavicurious-vasavi
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Add Day 13 medium level array Programs
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‎src/array_Programming/medium/day_13/CheckPalindromicArray.java‎

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package array_Programming.medium.day_13;
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import java.util.Scanner;
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//3. Write a Java program to check if an array is a palindrome.
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public class CheckPalindromicArray
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{
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public static boolean isPalindrome(int[] arr)
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{
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for (int i = 0; i < arr.length / 2; i++)
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{
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if (arr[i] != arr[arr.length - 1 - i])
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{
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return false;
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}
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}
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return true;
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}
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public static void checkPalindromicArray(int[] arr)
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{
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if (isPalindrome(arr))
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{
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System.out.println("The array is a palindrome.");
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}
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else
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{
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System.out.println("The array is not a palindrome.");
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}
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the array:");
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int size = sc.nextInt();
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int[] arr = new int[size];
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System.out.println("Enter " + size + " elements:");
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for (int i = 0; i < arr.length; i++)
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{
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arr[i] = sc.nextInt();
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}
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checkPalindromicArray(arr);
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sc.close();
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}
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}

‎src/array_Programming/medium/day_13/CheckTwoArraysEqaul.java‎

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package array_Programming.medium.day_13;
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import java.util.Arrays;
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import java.util.Scanner;
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//5. Write a Java program to check if two arrays are equal or not.
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public class CheckTwoArraysEqaul
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{
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public static boolean areArraysEqual(int[] arr1, int[] arr2)
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{
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if (arr1.length != arr2.length)
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{
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return false;
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}
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for (int i = 0; i < arr1.length; i++)
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{
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if (arr1[i] != arr2[i])
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{
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return false;
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}
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}
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return true;
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}
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public static void checkEquality(int[] arr1, int[] arr2)
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{
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if (areArraysEqual(arr1, arr2))
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{
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System.out.println("Both arrays are equal.");
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}
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else
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{
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System.out.println("Both arrays are not equal.");
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}
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the first array :");
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int n1 = sc.nextInt();
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int [] arr1 = new int[n1];
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System.out.println("Enter" + n1 + " elements");
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for(int i = 0;i<=arr1.length-1;i++)
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{
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arr1[i] =sc.nextInt();
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}
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System.out.println(Arrays.toString(arr1));
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System.out.println("Enter the size of the second array :");
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int n2 = sc.nextInt();
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int [] arr2 = new int[n2];
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System.out.println("Enter" + n2 + " elements");
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for(int j = 0;j<=arr2.length-1;j++)
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{
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arr2[j] = sc.nextInt();
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}
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System.out.println(Arrays.toString(arr2));
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checkEquality(arr1, arr2);
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sc.close();
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}
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}

‎src/array_Programming/medium/day_13/CountElementsWithoutLength.java‎

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package array_Programming.medium.day_13;
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//6. Count the number of elements in an array without using the .length property.
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import java.util.Scanner;
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public class CountElementsWithoutLength
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{
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public static int countElements(int[] arr)
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{
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int count = 0;
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try
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{
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while (true)
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{
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int temp = arr[count];
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count++;
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}
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}
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catch (Exception e)
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{
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}
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return count;
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}
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public static void printCount(int[] arr)
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{
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int total = countElements(arr);
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System.out.println("Number of elements in the array: " + total);
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the array:");
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int size = sc.nextInt();
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int[] arr = new int[size];
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System.out.println("Enter " + size + " elements:");
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for (int i = 0; i < size; i++)
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{
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arr[i] = sc.nextInt();
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}
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printCount(arr);
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sc.close();
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}
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}

‎src/array_Programming/medium/day_13/FirstNonReapeatingElement.java‎

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package array_Programming.medium.day_13;
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//2. Write a Java program to find the first non-repeating element in an array.
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import java.util.Scanner;
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public class FirstNonReapeatingElement
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{
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public static void printFirstNonRepeating(int[] arr)
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{
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boolean found = false;
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for (int i = 0; i < arr.length; i++)
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{
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int count = 0;
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for (int j = 0; j < arr.length; j++)
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{
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if (arr[i] == arr[j])
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{
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count++;
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}
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}
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if (count == 1)
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{
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System.out.println("First non-repeating element: " + arr[i]);
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found = true;
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break;
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}
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}
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if (!found)
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{
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System.out.println("No non-repeating element found.");
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}
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the array:");
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int size = sc.nextInt();
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int[] arr = new int[size];
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System.out.println("Enter " + size + " elements:");
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for (int i = 0; i < arr.length; i++)
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{
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arr[i] = sc.nextInt();
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}
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printFirstNonRepeating(arr);
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sc.close();
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}
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}
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‎src/array_Programming/medium/day_13/MaximumProductOfTwo.java‎

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package array_Programming.medium.day_13;
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//7. Write a Java program to find the maximum product of two integers in an array.
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import java.util.Scanner;
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public class MaximumProductOfTwo
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{
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public static int findMaxProduct(int[] arr)
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{
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int max1 = Integer.MIN_VALUE;
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int max2 = Integer.MIN_VALUE;
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int min1 = Integer.MAX_VALUE;
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int min2 = Integer.MAX_VALUE;
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for (int i = 0; i < arr.length; i++)
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{
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int val = arr[i];
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if (val > max1)
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{
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max2 = max1;
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max1 = val;
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}
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else if (val > max2)
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{
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max2 = val;
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}
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if (val < min1)
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{
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min2 = min1;
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min1 = val;
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}
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else if (val < min2)
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{
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min2 = val;
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}
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}
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int product1 = max1 * max2;
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int product2 = min1 * min2;
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return Math.max(product1, product2);
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}
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public static void printMaxProduct(int[] arr)
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{
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if (arr.length < 2)
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{
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System.out.println("Array must contain at least two elements.");
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return;
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}
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int result = findMaxProduct(arr);
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System.out.println("Maximum product of two elements: " + result);
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the array:");
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int size = sc.nextInt();
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int[] arr = new int[size];
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System.out.println("Enter " + size + " elements:");
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for (int i = 0; i < arr.length; i++)
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{
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arr[i] = sc.nextInt();
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}
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printMaxProduct(arr);
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sc.close();
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}
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}
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‎src/array_Programming/medium/day_13/MoveZerosToTheEnd.java‎

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package array_Programming.medium.day_13;
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import java.util.Arrays;
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import java.util.Scanner;
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//10. write a java program to move all the zeros to the end of the array.
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public class MoveZerosToTheEnd
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{
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public static int[] moveZeros(int[] arr)
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{
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int[] result = new int[arr.length];
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int index = 0;
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for (int i = 0; i < arr.length; i++)
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{
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if (arr[i] != 0)
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{
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result[index++] = arr[i];
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}
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}
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return result;
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}
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public static void printArray(int[] arr)
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{
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System.out.println("Array after moving zeros to end:");
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System.out.println(Arrays.toString(arr));
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}
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public static void main(String[] args)
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the size of the array:");
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int size = sc.nextInt();
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int[] arr = new int[size];
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System.out.println("Enter " + size + " elements:");
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for (int i = 0; i < arr.length; i++)
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{
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arr[i] = sc.nextInt();
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}
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int[] result = moveZeros(arr);
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printArray(result);
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sc.close();
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}
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}
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