Aequalis Software Solutions Interview Questions and Answers

Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.

• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application

Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.

• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues

Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.

• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.

Smart pointers in C++ are objects that act like pointers but provide automatic memory management.

• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.

Program to find perfect squares between two numbers

• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square

Primary key uniquely identifies a record in a table, while unique key ensures all values in a column are distinct.

• Primary key does not allow NULL values, while unique key allows one NULL value.

• A table can have only one primary key, but multiple unique keys.

• Primary key is a combination of unique and not null constraints.

• Primary key is used to establish relationships between tables, while unique key is used to enforce uniqueness in a column.

Overloading is having multiple methods with the same name but different parameters. Overriding is implementing a method in a subclass that is already defined in the parent class.

• Overloading allows a class to have multiple methods with the same name but different parameters.

• Overriding occurs when a subclass provides a specific implementation of a method that is already provided by its parent class.

• Overloading is resolved at compile time based on the method signature, while ove...read more

Recursively find the sum of digits in a given number

• Create a recursive function that takes in a number as input

• Base case: if the number is less than 10, return the number

• Recursive case: return the last digit of the number added to the result of calling the function with the number divided by 10

• Example: For input 123, the sum of digits would be 1 + 2 + 3 = 6