The document contains sample code snippets for 7 questions related to arrays in Java. For each question, it provides the problem statement, sample input, sample output, and the Java code to solve the problem. The problems include searching for an element in an array, finding the number of occurrences of an element, finding the largest element, finding pairs with a given sum, rotating an array, finding the unique element, and checking if an array is a palindrome. It also includes 2 multiple choice questions to predict the output of code snippets.

2. Programming

3. Sample Input: Sample Output:
Found
Question 1
Write a Java code to search a given number in an array. If the element is
found then print Found, else print Not Found
arr_size = 5
arr[] = {23, 82, 57, 45, 38}
search_elem = 45

4. import java.util.Scanner;
public class MyClass {
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
int arr_size = sc.nextInt();
int arr[] = new int[arr_size];
int i;
for(i = 0; i < arr_size; i++)
{
arr[i] = sc.nextInt();
}
int search_elem = sc.nextInt();
int is_matched = 0;
for(i = 0; i < arr_size; i++)
{
if(arr[i] == search_elem)
{
is_matched = 1;
break;
}
}
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5. if(is_matched == 1)
{
System.out.print("Found");
}
else
{
System.out.print("Not Found");
}
}
}
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6. Sample Input: Sample Output:
2
Question 2
Write a Java code to find the number of occurrences of a given number in
an array.
arr_size = 6
arr[] = {3, 82, 57, 45, 3, 8}
search_elem = 3

7. import java.util.Scanner;
public class MyClass {
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
int arr_size = sc.nextInt();
int arr[] = new int[arr_size];
int i;
for(i = 0; i < arr_size; i++){
arr[i] = sc.nextInt();
}
int search_elem = sc.nextInt();
int count = 0;
for(i = 0; i < arr_size; i++)
{
if(arr[i] == search_elem)
{
count++;
}
}
System.out.print(count);
}
}
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8. Sample Input: Sample Output:
7
Question 3
Write a Java code to find the largest number in an array.
arr_size = 5
arr[] = {1, 7, 3, 4, 5}

9. import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int arr[]=new int[a];
for(int i = 0; i < a; i++)
{
arr[i] = sc.nextInt();
}
int max = 0;
for(int i = 0; i < a; i++)
{
if(arr[i] > max)
{
max = arr[i];
}
}
System.out.print(max);
}
}
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10. Sample Input: Sample Output:
10, 20
30, 0
Question 4
Write a Java code to find all pairs of elements whose sum is equal to the
given value.
arr_size = 5
arr[] = {50, 10, 30, 20, 0}
value = 30

11. import java.util.Scanner;
public class Main{
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int arr[] = new int[a];
for(int i = 0; i < a; i++){
arr[i] = sc.nextInt();
}
int value = sc.nextInt();
int temp = 0;
for(int i = 0; i < a; i++) {
for(int j = i+1; j < a; j++) {
temp = arr[i]+arr[j];
if(temp == value){
System.out.print(arr[i]+ ", "+arr[j]);
System.out.println();
}
temp = 0;
}
}
}
}
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12. Sample Input: Sample Output:
3 4 5 1 2
Question 5
Write a Java code to rotate an array.
arr_size = 5
arr[] = {1, 2, 3, 4, 5}
no_of_rotations = 2
(HINT: You have to circularly left shift array by 2 positions)

13. import java.util.Scanner;
public class Main
{
public static void rotate_arr(int arr_size, int arr[], int no_of_rotate)
{
for(int i = 1; i <= no_of_rotate; i++)
{
int temp = arr[0];
for(int j = 1; j < arr_size; j++)
{
arr[j-1] = arr[j];
}
arr[arr_size-1] = temp;
}
}
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14. public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
int arr_size = sc.nextInt();
int arr[] = new int[arr_size];
for(int index = 0; index < arr_size; index++)
{
arr[index] = sc.nextInt();
}
int no_of_rotate = sc.nextInt();
rotate_arr(arr_size, arr, no_of_rotate);
for(int i = 0; i < arr_size; i++)
{
System.out.print(arr[i] + " ");
}
}
}
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15. Sample Input: Sample Output:
1 7
Question 6
Write a Java code to find the unique element in the given array.
arr_size = 6
arr[] = {1, 2, 3, 2, 3, 7}

16. import java.util.Scanner;
class Main
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
int arr_size = sc.nextInt();
int arr[] = new int[arr_size];
for(int index = 0; index < arr_size; index++)
{
arr[index] = sc.nextInt();
}
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17. for(int index1 = 0; index1 <= arr_size-1; index1++)
{
int has_occurred = 0;
for(int index2 = 0; index2 <= arr_size-1; index2++)
{
if((index1 != index2) && (arr[index1] == arr[index2]))
{
has_occurred = 1;
break;
}
}
if(has_occurred == 0)
{
System.out.print(arr[index1] + " ");
}
}
}
}
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18. Sample Input: Sample Output:
Yes
Question 7
Write a Java code to check whether the given array is a palindrome or not. If
the given array is a palindrome, then print "Yes". Otherwise, print "No".
arr_size = 5
arr[] = {4, 5, 3, 5, 4}

19. import java.util.Scanner;
class Main{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
int arr_size = sc.nextInt();
int arr[] = new int[arr_size];
for(int idx = 0; idx <= arr_size - 1; idx++)
{
arr[idx] = sc.nextInt();
}
int left = 0;
int right = arr_size - 1;
boolean is_palindrome = true;
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20. while(left <= right)
{
if(arr[left] != arr[right])
{
is_palindrome = false;
break;
}
left++;
right--;
}
if(is_palindrome == true){
System.out.print("Yes");
}
else{
System.out.print("No");
}
}
}
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21. // Predict the output
import java.util.Scanner;
public class Main
{
public static void main(String args[])
{
int arr[] = {10, 20, 30, 40, 50};
System.out.print(arr[2]);
}
}
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22. MCQ

23. No output
Question 1
A)
ArrayIndexOutOfBoundsException
B)
40
C)
30
D)

24. // Predict the output
import java.util.Scanner;
class Main
{
public static void main (String[] args)
{
int arr[] = {10, 20, 30, 40};
int a = 50;
call(a,arr);
System.out.println(a);
System.out.println(arr[0]);
System.out.println(arr[1]);
}
public static void call(int a, int arr[])
{
a = a + 2;
arr[0] = 100;
arr[1] = 200;
}
}
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25. 50
100
200
Question 2
A)
52
100
200
B)
50
10
20
C)
52
10
20
D)

26. // Predict the output
import java.util.Scanner;
public class Main
{
public static void main(String args[])
{
int arr[2];
System.out.println(arr[0]);
System.out.println(arr[1]);
}
}
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27. Garbage value
Garbage value
Question 3
A)
ArrayIndexOutOfBoundsException
B)
Compilation error
C)
0
0
D)

28. THANK YOU