HCLTech Senior Support Engineer Interview Questions and Answers

Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.

• Start from the first element and compare it with the next element

• If the next element is smaller, swap them

• Repeat this process for all elements in the array

• Continue this process until no more swaps are needed

A program to print all prime numbers

• Take input from user for range of numbers

• Loop through the range and check if each number is prime

• Print the prime numbers

Hashmap is a data structure that stores key-value pairs and allows constant time access to values based on their keys.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Examples of hashmap implementations include Java's HashMap class and Python's dict type.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add new properties and methods.

• For...read more

Implement a stack using a queue data structure.

• Create two queues, q1 and q2.

• Push operation: Enqueue the element to q1.

• Pop operation: Dequeue all elements from q1 to q2 except the last one. Dequeue the last element from q1 and return it. Swap q1 and q2.

• Top operation: Dequeue all elements from q1 to q2 except the last one. Dequeue the last element from q1 and return it. Enqueue the element to q2. Swap q1 and q2.

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Finding address of an element in an array given the address of 0th index.

• Calculate the offset of the desired element from the 0th index address and add it to the 0th index address.

• Address of ith element = address of 0th element + i * size of each element.

• Example: Address of 3rd element in an array of strings = address of 0th element + 3 * size of string.