Computer Science Interview Questions and Answers
Ques 21. What is the difference between synchronous and asynchronous programming?
Synchronous programming executes tasks one at a time and waits for each task to complete, while asynchronous programming allows tasks to overlap and continue without waiting for each other.
Example:
Synchronous: Blocking function calls. Asynchronous: Using callbacks or promises in JavaScript.
Ques 22. Explain the concept of a binary tree.
A binary tree is a hierarchical data structure composed of nodes, where each node has at most two children, referred to as the left child and the right child.
Example:
Binary search trees are a common application of binary trees for efficient searching.
Ques 23. What is the purpose of the 'SELECT' statement in SQL?
The 'SELECT' statement retrieves data from one or more tables in a database and allows for filtering, sorting, and grouping of the results.
Example:
Fetching all columns from a 'users' table: 'SELECT * FROM users;'
Ques 24. Explain the concept of the MVC (Model-View-Controller) architectural pattern.
MVC separates an application into three interconnected components: the Model (data and business logic), the View (user interface), and the Controller (handles user input and updates the model).
Example:
Building web applications with frameworks like Django (Python) or Ruby on Rails (Ruby).
Ques 25. What is the purpose of the 'try', 'catch', and 'finally' blocks in exception handling?
'try' is used to enclose a block of code that might raise an exception. 'catch' is used to handle the exception, and 'finally' is used for code that must be executed regardless of whether an exception was thrown or not.
Example:
Ensuring resources are released in the 'finally' block, even if an exception occurs.
Most helpful rated by users:
- What is the difference between a stack and a queue?
- What is the purpose of an index in a database?
- What is the purpose of the 'git' version control system?