mhahnfr / dc4c

Standard data containers for C.

                /####/  #################                                      
              /####/    #####/     ######                                      
            /####/      ###/       ######                                      
          /####/        #/         /####/                                      
        /####/          /        /####/                                        
      /####/                   /####/                                          
    /####/                   /####/                                            
  /####/                   /####/       /                                      
/####/                   /####/        /#                                      
#####################   ######       /###                                      
#####################   ######     /#####                                      
#####################   #################                                      
               ######                                                          
               ######                                                          
               ######   #                                                      
   _                    #  #  #  #==  #  #    #==\   #==,  *==*  #\\  #  #\\  #
  |c| mhahnFr           #  #==#  #=   #  #    #==<   #=*   #  #  # \\ #  # \\ #
  '-'                   #  #  #  #==  #  #==  #==/   # \\  *==*  #  \\#  #  \\#
                        #                                                      

👋 Hey there, I'm mhahnFr!

As of now, I speak these languages:

Among others, I use these tools:

Currently, I am studying at the 42 Heilbronn.

The 42 Heilbronn is a coding school with a completely new educational design: Everyone is learning from everyone - without teachers. This peer learning principle challenges the traditional education system very successfully.
More information can be found on their website: 42heilbronn.de. My 42 intra profile can be found here.

Short story

I started my journey in the world of coding back when I was 12 years old using the Java Programming language. Later on, I added another language to my portfolio, the Swift Programming language. At the 42 Heilbronn, I learned the C and the C++ Programming languages.

Read the full story here.

Fun facts

How to break Swifts type checker (Click to expand)

let data: [UInt8] = [ 128, 128, 128, 128 ]

let i: Int = data[0] & 0xff << 24
           | data[1] & 0xff << 16
           | data[2] & 0xff <<  8
           | data[3] & 0xff <<  0

Correct solution (Click to expand)

let i: Int = Int(data[0]) & 0xff << 24
           | Int(data[1]) & 0xff << 16
           | Int(data[2]) & 0xff <<  8
           | Int(data[3]) & 0xff <<  0

Discovered while writing this piece of code.

Crash the JVM (Click to expand)

import java.lang.reflect.Field;
import sun.misc.Unsafe;

class Breaker {
    private final Unsafe unsafe;
    
    public Breaker() throws Exception {
        final var field = Unsafe.class.getDeclaredField("theUnsafe");
        field.setAccessible(true);
        
        unsafe = (Unsafe) field.get(null);
        
        segfault();
        freeError();
    }
    
    private void freeError() { unsafe.freeMemory(Integer.MAX_VALUE); }
    
    private void segfault() { unsafe.putByte(Integer.MAX_VALUE, (byte) 0); }
    
    public static void main(String[] args) throws Exception { new Breaker(); }
}