====== Lab04 - Arrays ======

==== Task 1 ====
  * A command-line argument specifies the number of integers to read (N)
  * Read N integers from standard input using [[https://cppreference.net/c/io/fscanf.html | scanf()]] to a variable-length array of size N
  * Print the array in the order entered
  * Sort the array in descending order using [[https://cppreference.net/c/algorithm/qsort.html | qsort()]]
  * Print the sorted array

==== Task 2 ====
  * Write a program which allows the user to enter an “infinite” number of characters and will keep appending them to an array.
  * When they press ''P'', it will output the current array.
  * If they enter a character ''X'', it will convert the chars to upper case with [[https://cppreference.net/c/string/byte/toupper.html|toupper()]], print them and exit.
  * Use the [[https://cppreference.net/c/io/getchar.html|getchar()]] function to get letters from the command line.
  * You will need to use [[https://cppreference.net/c/memory/malloc.html|malloc()]] and [[https://cppreference.net/c/memory/realloc.html|realloc()]] to control the memory.
  * Don’t forget to use [[https://cppreference.net/c/memory/free.html|free()]] at the end to free the memory.
  * If you have time, add also sorting the chars alphabetically and lower case before upper case.

==== Valgrind ====
  * use ''valgrind'' for memory leak detection
  * can detect forgotten allocated memory and the exact location of out-of-bound access
  * can report using uninitialized variables/memory
  * for better output, compile your program with ''-g'' flag
  * ''valgrind ./your-program''

==== Documentation ====
  * [[https://en.cppreference.com/w/c]]
  * Learn to understand the function declaration (the name, return type, and parameters) 
  * The definition (code to be executed) might not always be available