Intermediate

Articles that assume you already know the fundamentals and focus on extending, combining or applying those concepts to more complete cases.

90 articles

Topic

Type

TheoryJava

Java LinkedList — Node, first and next for the exam’s linked list (no ArrayList and without losing the queue)

Nov 2, 2026

PracticeJava

Java LinkedList practice — the booking queue with first and last, the sorted loans and the queue turned around (like in Exam 3)

Nov 2, 2026

ExercisesJava

Java LinkedList exercises — the booking at position N, the repeated members and the queue split in half (with solutions and cheat sheet)

Nov 2, 2026

TheoryC

System calls in C — theory with open, read, write, lseek and a saved game written on top of another (and the points that weren’t mine)

Oct 26, 2026

PracticeC

System calls in C — practice saving, copying and editing game saves with open, read, write and lseek (and the backup that was 96 bytes long)

Oct 26, 2026

ExercisesC

System calls in C — exercises with byte counters, O_APPEND, a ranking of saved games and three lseek and read bugs (and the saved game that refused to go first)

Oct 26, 2026

ExercisesC

Processes in Linux with C — exercises with cooks that multiply, buffers that double and exit codes that lie (and the kitchen that hired seven cooks)

Oct 25, 2026

PracticeC

Processes in Linux with C — practice with a head chef, cooks working at the same time and a pass that runs real commands (and the service that closed too early)

Oct 25, 2026

TheoryC

Processes in Linux with C — theory with fork(), exec and wait in a restaurant kitchen (and the counter that stayed at 0)

Oct 25, 2026

ExercisesC

The preprocessor in C — exercises with lift capacity, a floor limiter and a simulator with traces (and the DEBUG 0 that switched nothing off)

Oct 24, 2026

PracticeC

The preprocessor in C — practice with a lift panel, a debug logger and three models in one file (and the submission full of traces)

Oct 24, 2026

TheoryC

The preprocessor in C — theory with a lift, #define, macros and #ifdef (and the six people who weighed 154 kg)

Oct 24, 2026

ExercisesC

Structs and strings in C — exercises with the movie listings, your own string.h functions and viewer records that arrive broken (and the VIP ticket that always cost 8 euros)

Oct 24, 2026

PracticeC

Structs and strings in C — practice with a cinema hall, a viewer finder and a box office on the heap (and the Lucía the program swore didn’t exist)

Oct 24, 2026

TheoryC

Structs and strings in C — theory with cinema seats, fields in memory and the ‘\0’ nobody sees (and the long name that changed the ID of the person next door)

Oct 24, 2026

TheoryC

Dynamic memory in C — theory with malloc, calloc, realloc and free, a class’s grades array that grows (and the Segmentation fault that taught me where everything lives)

Oct 24, 2026

ExercisesC

Dynamic memory in C — exercises to raise grades, filter the passes and keep a sorted array that grows (and the double free that knocked out my report)

Oct 24, 2026

PracticeC

Dynamic memory in C — practice with a grade report that shrinks, an array that grows as students arrive and a table of grades on the heap (and the realloc that nearly left me without data)

Oct 24, 2026

ExercisesJava

Collections in Java — exercises with authors, catalogs and a merge of two libraries (and the “b” that was in the map but never showed up)

Oct 8, 2026

PracticeJava

Collections in Java — practice with a word counter, custom keys and loan queues (and the HashMap that printed in an order I couldn’t understand)

Oct 8, 2026

TheoryJava

Collections in Java — theory with a library of books, List, Set and Map (and the Set that claimed to have the same book twice)

Oct 8, 2026

ExercisesJava

Iterators in Java — exercises with playlists, repeated titles and a range with a step (and the “Lighthouse” that never left)

Oct 8, 2026

PracticeJava

Iterators in Java — practice with safe deletes, a linked list of your own and a two-way playlist (and the second for-each that printed nothing)

Oct 8, 2026

TheoryJava

Iterators in Java — theory with a playlist, Iterator, Iterable and ListIterator (and the for-each that wouldn’t let me delete)

Oct 8, 2026

ExercisesJava

Comparable and Cloneable in Java — exercises with books, players and a cloned squad (and the subtraction that put the richest account first)

Oct 8, 2026

PracticeJava

Comparable and Cloneable in Java — practice with a ranking, backup copies and sorted trees (and the word that vanished from the TreeSet)

Oct 8, 2026

TheoryJava

Comparable and Cloneable in Java — theory with students, grades and copies (and the copy that changed the original)

Oct 8, 2026

ExercisesJava

Interfaces in Java — exercises with shapes, a library and sensors (and the cast that worked until a T-shirt showed up)

Oct 8, 2026

PracticeJava

Interfaces in Java — practice with a payment gateway, a shopping cart and a remote control (and the abstract class that couldn’t handle two parents)

Oct 8, 2026

TheoryJava

Interfaces in Java — theory with payments, cards and a mobile wallet (and the method where I forgot public)

Oct 8, 2026

PracticeJava

Exceptions in Java — practice with a grades importer, an ATM and a file reader (and the “Error” that told me nothing)

Oct 7, 2026

ExercisesJava

Exceptions in Java — exercises with a converter, dates and a bank (and the try I put in the wrong place)

Oct 7, 2026

TheoryJava

Exceptions in Java — theory with grades, students and red stack traces (and the “7,5” that brought my whole program down)

Oct 7, 2026

ExercisesJava

Inheritance in Java — exercises with an animal shelter, shapes that sort themselves and a restaurant’s staff (and the cast that turned my cat into a dog)

Oct 7, 2026

PracticeJava

Inheritance in Java — practice with a payroll, three-storey shapes and two kinds of account (and the balance I made public so it would compile)

Oct 7, 2026

TheoryJava

Inheritance in Java — theory with Laura, the student office and its teachers (and the super() missing from my first extends)

Oct 7, 2026

ExercisesJava

Classes and objects in Java — exercises with the faculty café, fractions and two shops (and the static that emptied the whole warehouse)

Oct 7, 2026

PracticeJava

Classes and objects in Java — practice with Laura’s account, the faculty library and the lab inventory (and the account that belonged to nobody)

Oct 7, 2026

TheoryJava

Classes and objects in Java — theory with Laura, her subjects and the student office (and the array full of null that made me think Java hated me)

Oct 7, 2026

ExercisesJava

Regular expressions in Java — exercises with the car park number plate, dates and the student office log (and the plate with vowels that slipped past me)

Oct 7, 2026

PracticeJava

Regular expressions in Java — practice with Laura’s form, the student office log and a text cleaner (and the invisible \r that broke every line)

Oct 7, 2026

TheoryJava

Regular expressions in Java — theory with Laura’s ID, email and phone number (and the error that made me think Java was broken)

Oct 7, 2026

ExercisesJava

Strings in Java — exercises with palindromes, word counting and the Caesar cipher (and an == trap I didn’t see coming)

Oct 7, 2026

PracticeJava

Strings in Java — practice with a student importer, a username generator and a contact finder (and why you must normalize before comparing)

Oct 7, 2026

TheoryJava

Strings in Java — equals, substring and split if you come from Python (and why == sometimes fools you)

Oct 5, 2026

ExercisesJava

Arrays in Java — exercises with reversing, rotating, removing duplicates and merging (and a bug hiding where you least expect it)

Oct 5, 2026

PracticeJava

Arrays in Java — practice with a shop, a matrix and the class grades (and how not to ruin the original)

Oct 5, 2026

TheoryJava

Arrays in Java — from Python lists to fixed size, indexes and references

Oct 1, 2026

ExercisesJava

Methods in Java — exercises with a converter, a week of temperatures and the guessing game of 31 (and the return the compiler couldn’t see)

Oct 1, 2026

PracticeJava

Methods in Java — practice with Laura’s calculator, her campus password and her grade report (and the format I changed in three places out of four)

Sep 30, 2026

TheoryJava

Methods in Java — theory with Laura’s final grade, the call stack and overloading (and the static I deleted because I didn’t know what it did)

Sep 30, 2026

ExercisesJava

Loops in Java — exercises with vowels, grades up to -1 and primes in a range (and the loop that once froze on me)

Sep 28, 2026

PracticeJava

Java loops practice — a text analyser, the guessing game that finally repeats and a pattern generator (and the extra round that crashed my program)

Sep 27, 2026

ExercisesJava

Java flow control exercises — the entry grade, the library and a three-attempt ATM (and the 9.5 that came out as “Pass”)

Sep 26, 2026

PracticeJava

Java flow control practice — a sign-up form, the student office desk and a three-attempt guessing game (and the passwords that didn’t match even though they were the same)

Sep 26, 2026

ExercisesJava

Java variables exercises — BMI, seconds and the print shop inventory (and the percentage that got stuck at 100)

Sep 21, 2026

PracticeJava

Java variables practice — Laura’s receipt, final grade and student card (with the grade that came out 0.0)

Sep 21, 2026

ExercisesJava

Java syntax exercises — the converter, the grade report and the cash machine receipt, lined up to the last character (with solutions and a cheat sheet)

Sep 18, 2026

PracticeJava

Java syntax practice — the enrolment card, the FP2 timetable and a receipt with three errors (to stop fearing javac)

Sep 17, 2026

TheoryJava

Loops in Java — for, for-each, while and do-while with Laura’s instalments (and the extra round that always sneaks in)

Sep 16, 2026

TheoryJava

Flow control in Java — Scanner, if/else and switch with Laura’s grade (and the question the program skipped)

Sep 14, 2026

TheoryJava

Variables in Java — primitive types, String, final and casting, with Laura’s card (and the division that always comes out one short)

Sep 13, 2026

TheoryJava

Java syntax — the class, main, println and the semicolon explained line by line (for anyone coming from Python)

Sep 12, 2026

ExercisesC

Functions in C — solved exercises with the bus: the second worst delay, stops that close and open and timetables that merge (plus the cheat sheet for the exam)

Aug 28, 2026

PracticeC

Functions in C — practice with 3 bus programs: searches with two results, arrays that transform and the route statistics (with scanf)

Aug 28, 2026

TheoryC

Functions in C — theory with prototypes, void and pass by value and by reference, charging a bus ticket (and the credit that wouldn’t go down)

Aug 28, 2026

ExercisesPython

Python LinkedList exercises — reservation number N, repeated members and the queue that never ends (with solutions and a cheat sheet)

Aug 28, 2026

PracticePython

Python LinkedList practice — loans, the reservation queue backwards and the sorted catalogue (three library programs)

Aug 28, 2026

TheoryPython

Python LinkedList — nodes, links, inserting and deleting without losing the queue (and why the order of two lines changes everything)

Aug 28, 2026

ExercisesPython

Testing in Python with unittest — exercises with black box, badly designed tests and a TDD bank account (and the test that always passed)

Aug 28, 2026

PracticePython

Testing in Python with unittest — practice with FP2 grades, the shop discount and a TDD for the pool (and the display that said 82 degrees)

Aug 28, 2026

TheoryPython

Testing in Python with unittest — theory with the sports centre, black box, white box, TDD and the pensioner who paid too much

Aug 26, 2026

ExercisesPython

Iterators and generators in Python — exercises with multiples, a sequence that resets and perfect numbers (and a fine that came out letter by letter)

Aug 26, 2026

PracticePython

Iterators and generators in Python — practice with endless Fibonacci, a prime pipeline and the library booking queue (and the laptop that kept thinking)

Aug 26, 2026

TheoryPython

Iterators and generators in Python — theory with the library shelf, a yield that pauses and a report that came out empty the second time

Aug 26, 2026

ExercisesPython

Python operator overloading exercises — complex numbers and polynomials that add, multiply and differentiate, with solutions, a quiz and a cheat sheet (and the shelf that turned into None)

Aug 26, 2026

PracticePython

Python operator overloading practice — fractions that simplify themselves, money without cent errors and the library shelf (and the dinner kitty that was always one cent off)

Aug 26, 2026

TheoryPython

Python operator overloading — theory with Vector2D: eq, add, str, reflected operators and @total_ordering (and the two equal vectors Python said weren’t equal)

Aug 26, 2026

ExercisesPython

Python inheritance exercises — animals, bank accounts and library loans, with solutions, a quiz and a cheat sheet (and the extra s that sank a mock exam)

Aug 26, 2026

PracticePython

Python inheritance practice — a payroll, a fleet with a hybrid and a shop with IGIC (and the formula the hybrid copied instead of inheriting)

Aug 26, 2026

TheoryPython

Python inheritance — theory with the faculty library: super(), overriding, polymorphism and abstract classes (and the ebook that lost its title)

Aug 26, 2026

ExercisesPython

Python classes exercises — a student and their grades, a vehicle that loses value and a stack with its own exceptions (and Laura’s report with Pablo’s fail on it)

Aug 26, 2026

PracticePython

Python classes practice — three programs: an account that can’t be tampered with, the faculty library and a copy shop with VAT for all (and the −4000 € balance nobody stopped)

Aug 26, 2026

TheoryPython

Python classes — theory with the faculty library: objects, self, encapsulation, @property and magic methods (and the book that was created without a title)

Aug 25, 2026

ExercisesPython

Python exceptions exercises — a unit converter, passwords with their own family of errors and a contact book that always saves (and the finally that closed a file that didn’t exist)

Aug 25, 2026

PracticePython

Python exceptions practice — four programs that don’t break: an enrolment form, a calculator, a grade reader and fractions (and the “12,5” that refused to be a number)

Aug 25, 2026

TheoryPython

Exceptions in Python — theory with the faculty admin office: try, except, else, finally, raise and assert (and the comma grade that knocked the script over)

Aug 25, 2026

ExercisesC

Pointers in C — solved exercises with the bus: copying timetables, counting passengers, adjusting delays and an array library (plus the cheat sheet for the exam)

Aug 24, 2026

PracticeC

Pointers in C — practice with 4 bus programs: swap, walks, the day summary and a search that can return NULL (to lose your fear of them)

Aug 24, 2026

TheoryC

Pointers in C — theory with addresses, * and &, and arrays walking the bus stops (and the credit that dropped without touching it)

Aug 24, 2026