Computer Science concepts, explained
- What is the difference between a compiler and an interpreter?
A compiler translates an entire program into machine code before it runs, while an interpreter translates and executes code line-by-line on the fly.
- How do you convert between binary, decimal, and hexadecimal?
Learn how to convert numbers between binary, decimal, and hexadecimal using place values and the four-bit grouping shortcut.
- What is a Boolean expression and how do you simplify one?
A Boolean expression evaluates to true or false. Learn how to simplify them using logic rules to make code and circuits more efficient.
- How do bubble sort, merge sort and quicksort compare?
Compare bubble sort, merge sort, and quicksort by learning their time complexities, everyday analogies, and when to use each algorithm.
- How does binary search work and why is it fast?
Binary search is a fast algorithm that finds a target in a sorted list by repeatedly dividing the search area in half, making it incredibly efficient.
- What is a binary search tree?
A binary search tree is a data structure that organizes data hierarchically, keeping smaller values on the left and larger ones on the right for fast lookups.
- What does Big O notation actually measure?
Big O notation measures how the runtime or memory requirements of an algorithm grow as the size of the input increases.
- What is a stack versus a queue?
A stack is a Last-In, First-Out (LIFO) data structure, while a queue is a First-In, First-Out (FIFO) data structure.
- How does a hash table work?
A hash table uses a hash function to map keys directly to array indexes, allowing for incredibly fast data retrieval and storage.
- What is the difference between an array and a linked list?
Learn the key differences between arrays and linked lists, including memory storage, access speeds, and how to choose the right data structure for your code.
- What is recursion, with a simple example?
Recursion is a programming technique where a function calls itself to solve smaller instances of the same problem until reaching a stopping point.
- How do functions and parameters work?
Learn how programming functions act as reusable mini-programs, and how parameters allow you to pass specific data into them.
- What is a variable's scope?
A variable's scope is the specific region of a program where that variable exists and can be accessed or modified by your code.
- What is the difference between a while loop and a for loop?
A for loop runs a specific number of times, while a while loop runs until a specific condition is no longer true.