Top TCS Interview Questions

What is the difference between monolithic architecture and microservices architecture?

What are the benefits of using Agile methodology in software development?

What is the purpose of a design pattern in software development?

What is the difference between a hash table and a binary search tree?

What are the principles of object-oriented programming?

What is the purpose of a database index?

What is the difference between a left join and a right join in SQL?

What is the purpose of a transaction in a database?

What are the benefits of using a cloud-based infrastructure?

What is the difference between a public cloud and a private cloud?

What is the purpose of a load balancer in a network?

What are the benefits of using a containerization platform?

What is the difference between a Docker container and a virtual machine?

What are the principles of DevOps?

What is the purpose of a continuous integration/continuous deployment (CI/CD) pipeline?

What are the benefits of using a version control system?

What is the difference between a Git repository and a SVN repository?

What are the principles of test-driven development (TDD)?

What is the purpose of a behavioral interview?

What are the benefits of using a project management framework?

What is the difference between a Waterfall methodology and an Agile methodology?

Write a Java program to find the maximum element in an array.

public class Main {
  public static void main(String[] args) {
    
    int[] array = {
      1, 2, 3, 4, 5}
      ;
      int max = array[0];
      for (int i = 1;
      i < array.length;
      i++) {
        
        if (array[i] > max) {
          
          max = array[i];
        }
      }
      System.out.println(max);
    }
  }

Write a Python program to reverse a string.

def reverse_string(s): return s[::-1] print(reverse_string('hello'))

Write a JavaScript program to find the first duplicate in an array.

function findFirstDuplicate(arr) {
  let set = new Set();
  for (let i = 0; i < arr.length; i++) {
    if (set.has(arr[i])) {
      return arr[i];
    }
    set.add(arr[i]);
  }
  return null;
}
console.log(findFirstDuplicate([1, 2, 3, 4, 2]));

Write a C++ program to find the minimum element in a linked list.

struct Node {
  int data;
  Node* next;
}
;
int findMin(Node* head) {
  int min = head->data;
  Node* current = head;
  while (current != NULL) {
    if (current->data < min) {
      min = current->data;
    }
    current = current->next;
  }
  return min;
}

Write a Java program to check if a string is a palindrome.

public class Main {
  public static void main(String[] args) {
    
    String str = 'madam';
    String rev = new StringBuilder(str).reverse().toString();
    if (str.equals(rev)) {
      
      System.out.println('Yes');
    }
    else {
      System.out.println('No');
    }
  }
}

Write a Python program to find the maximum sum of a subarray.

def max_subarray_sum(arr): max_sum = float('-inf') for i in range(len(arr)): for j in range(i, len(arr)): subarray_sum = sum(arr[i:j+1]) if subarray_sum > max_sum: max_sum = subarray_sum return max_sum print(max_subarray_sum([-2, 1, -3, 4, -1, 2, 1, -5, 4]))

Write a JavaScript program to find the first non-repeating character in a string.

function findFirstNonRepeatingChar(str) {
  let charCount = {};
  for (let char of str) {
    if (charCount[char]) {
      charCount[char]++;
    } else {
      charCount[char] = 1;
    }
  }
  for (let char of str) {
    if (charCount[char] === 1) {
      return char;
    }
  }
  return null;
}
console.log(findFirstNonRepeatingChar('aabbc'));

Write a C++ program to find the middle element of a linked list.

struct Node {
  int data;
  Node* next;
}
;
Node* findMiddle(Node* head) {
  Node* slow = head;
  Node* fast = head;
  while (fast != NULL && fast->next != NULL) {
    slow = slow->next;
    fast = fast->next->next;
  }
  return slow;
}