Programming
All the programming content on the website — Python, C, Java and any languages that will be added — organized by subject and level.
139 articles
Python21 topics
Variables
Types, assignment, input() and conversions
Exam-style quizOperators
Arithmetic, // and %, comparison and logic
Exam-style quizDebugging
Tracebacks, debug prints and pdb
Conditionals
if, elif, else and compound conditions
Exam-style quizLoops
for, while, range, break and continue
Exam-style quizFunctions
Parameters, return, scope and the call stack
Exam-style quizExceptions
try, except, raise and assert
Exam-style quizClasses
Objects, encapsulation and magic methods
Exam-style quizInheritance
super(), overriding, polymorphism and abstract classes
Exam-style quizOperator overloading
__add__, __eq__, __str__ and friends
Exam-style quizIterators and generators
iter, next, yield and the for loop inside
Exam-style quizTesting
White box, black box, TDD and unittest
Exam-style quizLinkedList
Nodes, links, inserting and deleting
Exam-style quizModules
import, packages and if __name__ == "__main__"
Exam-style quizLists and tuples
Indexes, slices, methods and traversals
Exam-style quizMutability and copies
References, copies, matrices and comprehensions
Exam-style quizRecursion
Base case, call stack and fast recursion
Exam-style quizAssociative containers
Dictionaries, sets and nested structures
Exam-style quizStrings
Indexes, str methods and formatted f-strings
Exam-style quizRegex
Patterns, groups, re.findall and quantifiers
Exam-style quizText files
open, modes, reading, writing and with
Exam-style quiz
C10 topics
Variables
Types, printf, scanf and the & operator
Conditionals
if, else if, switch and logical operators
Loops
for, while, do…while, break and continue
Pointers
Addresses, * and &, and pointers with arrays
Functions
Prototypes, void and pass by value and by reference
Dynamic memory
malloc, calloc, realloc, free and memory leaks
Structs
struct, strings and string.h functions
Preprocessor
#include, #define, macros and #ifdef
Processes
fork, exec, wait and parent and child processes
System calls
open, read, write, lseek and file descriptors
Java16 topics
Syntax
Classes, main, println and the basic syntax
Exam-style quizVariables
Primitive types, String, final and casting
Exam-style quizConditionals
Scanner, if/else, switch and logical operators
Exam-style quizLoops
for, for-each, while and do-while
Exam-style quizMethods
static, parameters, return and overloading
Exam-style quizArrays
Arrays, matrices, indexes and references
Exam-style quizStrings
equals, substring, split and the == trap
Exam-style quizRegex
Pattern, Matcher, groups and data validation
Exam-style quizClasses
Fields, constructors, getters and this
Exam-style quizInheritance
extends, super(), overriding and polymorphism
Exam-style quizExceptions
try, catch, finally, throw and your own ones
Exam-style quizInterfaces
interface, implements and abstract classes
Exam-style quizComparable and Cloneable
compareTo, sorting objects and clone()
Exam-style quizIterators
Iterator, Iterable, ListIterator and for-each
Exam-style quizCollections
List, Set, Map and when to use each
Exam-style quizLinkedList
Node, first, next, inserting, deleting, traversing
Exam-style quiz
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IC2 theory mock exam — first midterm, second midterm or the full exam, with your real mark and a review of every mistake (as if you were in the exam room)