42_exams

Contents of this github

exam #	exercise	subject	rendu	tester	tips	references
exam02	ft_printf	🟢	🟢	🟢	-	-
exam02	get_next_line	🟢	🟢	🟢	-	-
exam02	union	🟢	🟢	🟢	-	-
exam02	inter	🟢	🟢	🟢	-	-
exam03	micro_paint	🟢	🟢	-	-	🟢
exam03	mini_paint	🟢	-	-	-	🟢
exam04	microshell	🟢	🟢	-	-	-
exam05	Warlock.cpp	🟢	🟢	🟢	🟢	-
exam06	mini_serv	🟢	🟢	🟢	🟢	🟢

Tips for approaching exams

Read the subject & write your own code from scratch, without studying other students' code.
Make it work
If you need to look at someone else code / if there are still "minor" mistakes (that you consider stupid/minor but in all honnesty cannot correct without external help) => there are still things you need to learn/understand.
Read peer code to (1) learn from them and (2) optimize your code for exam conditions (shorter, more efficient etc.).
=> This is an exam, the code doesn't need to be bullet proof or best practice, it needs to work and be short so you are able to write and debug in 2 hours
Write your own tester
Practice in exam conditions (vim + term, silence, max 2h) once before the exam

Tips to write exams more efficiently

Vim documentation : https://vimdoc.sourceforge.net/
On term : CTRL + SHIFT + C / V to copy paste on terminal

1. Vim configuration

cat > ~/.myvimrc
set nu          // add numerotation of lines
set mouse=a     // add mouse control and selection
syntax on       // add colors

Other useful configuration options : https://dougblack.io/words/a-good-vimrc.html

2. Vim shortcuts essentials

Very basics

:i      // insertion mode
:w      // save 
:q      // quit
:!      // force
:[cmd]  // apply commands to single files (example :set nu)
dd      // delete a line
yy      // copy line
y       // copy word
p       // paste
u       // undo
U       // restore (undo) last changed line
Ctrl + r// redo
.       // repeat last command

Word substitution:

:%s/<old>/<new>	    // one at a time
:%s/<old>/<new>/g   // all at same time
:%s/<old>/<new>/gc  // replace all old with new throughout file with confirmations

Vim cheatsheet : additional shortcuts

https://devhints.io/vim
https://vim.rtorr.com/

3. Compilation, leaks and testing

Checking leaks with Address Sanitizer
https://github.com/google/sanitizers/wiki/AddressSanitizer

gcc -fsanitize=address -Wall -Werror -Wextra *.c -o myexecutable                    // C compilation
clang++ -fsanitize=address -Wall -Wextra -Werror -std=c++98 *.cpp -o myexecutable   // C++ compilation

Checking leaks with Valgrind

clear && gcc -g -Wall -Wextra -Werror mini_serv.c -o mini_serv && valgrind ./mini_serv 8080
clear && gcc -g -Wall -Wextra -Werror mini_serv.c -o mini_serv && valgrind --show-leak-kinds=all --leak-check=full ./mini_serv 8080

Testing your program when provided with main and/or output examples

cat > main.c                           // add includes, then copy paste main code from subject, CTRL+C to stop cat
cat > output.txt                       // copy paste expected output from subject, CTRL+C to stop cat

./myexecutable | cat -e > myoutput.txt // put your program output to a specific file

diff output.txt myoutput.txt           // test your output against the expected output

References

All updated subjects here -> JCluzet

Arivima/42_exams