diff --git a/biketour/tour.pas b/biketour/tour.pas
index 12fc182..a5171dd 100644
--- a/biketour/tour.pas
+++ b/biketour/tour.pas
@@ -1,16 +1,17 @@
 program login;
 
 uses
-  md5, crt;
+  md5, crt,
+  utils in '../lib/utils.pas';
 
 type
   CONNECTION = record
-    hotel : string;
+    hotel : string[10];
     distance : integer;
   end;
 
   HOTEL = record
-    name : string;
+    name : string[10];
     conn : CONNECTION;
   end;
 
@@ -21,20 +22,13 @@ type
   end;
 
 const
-users: array [0..4] of USER = (
-  (un: 'user1'; pw: '16d7a4fca7442dda3ad93c9a726597e4'; l: false),
-  (un: 'user2'; pw: 'ccd2fc33d2d423d7209035dbfff82b29'; l: false),
-  (un: 'user3'; pw: '57c2877c1d84c4b49f3289657deca65c'; l: false),
-  (un: 'user4'; pw: '4101bef8794fed986e95dfb54850c68b'; l: false),
-  (un: 'root';  pw: '63a9f0ea7bb98050796b649e85481845'; l: false)
-  );
-hotels: array [0..4] of HOTEL = (
-  (name: 'Hotel 1'; conn: (hotel: 'Hotel 2'; distance: 11)),
-  (name: 'Hotel 2'; conn: (hotel: 'Hotel 3'; distance: 5)),
-  (name: 'Hotel 3'; conn: (hotel: 'Hotel 4'; distance: 11)),
-  (name: 'Hotel 4'; conn: (hotel: 'Hotel 5'; distance: 5)),
-  (name: 'Hotel 5'; conn: (hotel: ''; distance: 0))
-);
+  users: array [0..4] of USER = (
+    (un: 'user1'; pw: '16d7a4fca7442dda3ad93c9a726597e4'; l: false),
+    (un: 'user2'; pw: 'ccd2fc33d2d423d7209035dbfff82b29'; l: false),
+    (un: 'user3'; pw: '57c2877c1d84c4b49f3289657deca65c'; l: false),
+    (un: 'user4'; pw: '4101bef8794fed986e95dfb54850c68b'; l: false),
+    (un: 'root';  pw: '63a9f0ea7bb98050796b649e85481845'; l: false)
+    );
 
 var
   readinput: string;
@@ -42,87 +36,93 @@ var
   correct: boolean;
   usersuccess: boolean = false;
   time: real;
+  hotels_f: File of HOTEL;
 
-function distance_sum(hnum1, hnum2 :integer) : integer;
-{ Calculate the total distance sum. }
+
+function get_hotel_by_name(hname: String) : HOTEL;
+{ Read the hotels from the  file and find the one with the right name }
 var
-  distance_total : integer = 0;
-  i : integer;
+  htemp : HOTEL;
 begin
-  if (hnum1 > hnum2) then
-    for i := (hnum1-2) downto (hnum2-1) do
-      distance_total := distance_total + hotels[i].conn.distance
-  else
-    for i := (hnum1-1) to (hnum2-2) do
-      distance_total := distance_total + hotels[i].conn.distance;
-  distance_sum := distance_total;
+  Reset(hotels_f);
+  while not EOF(hotels_f) do
+  begin
+    Read(hotels_f, htemp);
+    if htemp.name = hname then
+    begin
+      get_hotel_by_name := htemp;
+      Break;
+    end;
+  end;
 end;
 
-procedure calc_time(disttot : integer);
-{ Calculate the time needed for the way and print it. }
+
+function get_total_length : integer;
+{ Calculates the total lenght between two hotels }
 var
-  velocity : integer;
+  htemp: HOTEL;
 begin
-      Write('Velocity (km/h): ');
-      ReadLn(velocity);
-      time := (disttot / velocity);
-      WriteLn('Estimated Time: ', time: 10: 2, ' hours');
+  Reset(hotels_f);
+  get_total_length := 0;
+  while not EOF(hotels_f) do
+  begin
+    Read(hotels_f, htemp);
+    get_total_length := get_total_length + htemp.conn.distance;
+  end;
 end;
 
-procedure printway(hnum1, hnum2 : integer);
-{ Print the whole way to the console. }
+
+function get_path_length (hotel1, hotel2 : String) : Integer;
 var
+  htemp: HOTEL;
+  next_name: String;
   i : integer;
 begin
-  Writeln('Tour:');
-  if hnum1 > hnum2 then
-    for i := hnum1 downto hnum2 do
-    begin
-      if (i <> hnum1) then
-        Write(' -> ');
-      Write(hotels[i-1].name)
-    end
-  else
-    for i := hnum1 to hnum2 do
+  htemp := get_hotel_by_name(hotel1);
+  next_name := htemp.conn.hotel;
+  get_path_length := 0;
+  get_path_length := get_path_length + htemp.conn.distance;
+  i := 0;
+  Writeln(next_name, ' ',hotel2);
+  while not (next_name = hotel2) do
+  begin
+    i += 1;
+    htemp := get_hotel_by_name(next_name);
+    next_name := htemp.conn.hotel;
+    get_path_length := get_path_length + htemp.conn.distance;
+    if i > 1000 then
     begin
-      if (i <> hnum1) then
-        Write(' -> ');
-      Write(hotels[i-1].name)
-    end; 
-  Writeln;
+      get_path_length := -1;
+      Break;
+    end;
+  end;
 end;
 
+
 procedure calcway;
 { Calculate the sum of all distances and call functions
   that use this value. }
 var
   i, distance_total : integer;
+  h1, h2: HOTEL;
+  rin : String;
 begin
-  distance_total := 0;
-    for i := 0 to 4 do
-    begin
-      distance_total += hotels[i].conn.distance
-    end;
-    Writeln('Total tour length: ', distance_total, ' km');
-    Write('First Hotel Number: ');
-    ReadLn(hnum1);
-    Writeln;
-    Write('Second Hotel Number: ');
-    ReadLn(hnum2);
-    printway(hnum1, hnum2);
-
-    If ((hnum1 <= 5) and (hnum2 <= 5)) then
-    begin
-      distance_total := distance_sum(hnum1, hnum2);
-      Writeln('Distance between hotels is ', distance_total, ' km');
-      calc_time(distance_total);
-    end;
+  distance_total := get_total_length;
+  Writeln('Total tour length: ', distance_total, ' km');
+  Write('First Hotel Name: ');
+  ReadLn(rin);
+  h1 := get_hotel_by_name(rin);
+  Writeln;
+  Write('Second Hotel Number: ');
+  ReadLn(rin);
+  h2 := get_hotel_by_name(rin);
+  Writeln(get_path_length(h1.name, h2.name));
 end;
 
+procedure hotelmain;
 { Calculates the total distance between hotels based on the hotel number input.
   (Only numbers accepted!). After printing the total distance a velocity can be
   input to calculate the estimated time. }
-procedure hotelmain;
 var
   i : integer;
   exit : boolean = false;
@@ -199,6 +199,7 @@ begin
   Writeln('Tourplanner');
   Writeln('Written by J.Riegel.');
   TextColor(White);
+  Assign(hotels_f, 'hotels.bin');
 
   { endless loop/main loop of the program. Exit with CTRL-C }
   while true do
diff --git a/file/Hello.txt b/file/Hello.txt
new file mode 100644
index 0000000..e965047
--- /dev/null
+++ b/file/Hello.txt
@@ -0,0 +1 @@
+Hello
diff --git a/file/filefile.pas b/file/filefile.pas
new file mode 100644
index 0000000..90f6608
--- /dev/null
+++ b/file/filefile.pas
@@ -0,0 +1,131 @@
+program hellofile;
+
+const
+  dir = 'C:/Users/dev/Documents/Pascal/file_test/';
+
+procedure write_txt;
+var
+  txtfile: TextFile;
+  i: Integer;
+begin
+  Assign(txtfile, dir+'Hello');
+  Rewrite(txtfile);
+  for i := 0 to 9 do
+    WriteLn(txtfile, 'Hello');
+  Close(txtfile);
+end;
+
+procedure write_int;
+var
+  intfile: File of Integer;
+  i: Integer;
+begin
+  Assign(intfile, dir+'intense');
+  Rewrite(intfile);
+  for i := 0 to 9 do
+    Write(intfile, i);
+  Close(intfile);
+end;
+
+procedure read_int;
+var
+  intfile: File of Integer;
+  i, res: Integer;
+begin
+  Assign(intfile, dir+'intense');
+  Reset(intfile);
+  for i := 0 to 9 do
+  begin
+    Read(intfile, res);
+    WriteLn(res);
+  end;
+  Close(intfile);
+end;
+
+procedure write_bool;
+var
+  boolfile: File of Boolean;
+  i: Integer;
+begin
+  Assign(boolfile, dir+'bool');
+  Rewrite(boolfile);
+  for i := 0 to 4 do
+    Write(boolfile, true);
+    Write(boolfile, false);
+  Close(boolfile);
+end;
+
+procedure write_int64;
+var
+  intfile: File of int64;
+  i: Integer;
+begin
+  Assign(intfile, dir+'more_intense');
+  Rewrite(intfile);
+  for i := 0 to 9 do
+    Write(intfile, i);
+  Close(intfile);
+end;
+
+procedure write_real;
+var
+  f: File of real;
+  i: Integer;
+begin
+  Assign(f, dir+'reallife');
+  Rewrite(f);
+  for i := 0 to 9 do
+    Write(f, real(i/2));
+  Close(f);
+end;
+
+procedure write_very_int;
+var
+  f: File of Integer;
+  i: Integer;
+begin
+  Assign(f, dir+'veryint');
+  Rewrite(f);
+  for i := -256 to 255 do
+    Write(f, i);
+  Close(f);
+end;
+
+procedure read_very_int;
+var
+  f: File of Integer;
+  i, res: Integer;
+begin
+  Assign(f, dir+'veryint');
+  Reset(f);
+  for i := -256 to 255 do
+  begin
+    Read(f, res);
+    WriteLn(res);
+  end;
+  Close(f);
+end;
+
+procedure write_string;
+var
+  f: File of String[10];
+  i: Integer;
+begin
+  Assign(f, dir+'tstring');
+  Rewrite(f);
+  for i := 0 to 9 do
+    Write(f, 'tkdiekdhdk');
+  Close(f);
+end;
+
+begin
+  write_txt;
+  write_int;
+  write_bool;
+  write_int64;
+  write_real;
+  write_very_int;
+  write_string;
+  read_int;
+  read_very_int;
+end.
\ No newline at end of file
diff --git a/file/lotto.pas b/file/lotto.pas
new file mode 100644
index 0000000..a600987
--- /dev/null
+++ b/file/lotto.pas
@@ -0,0 +1,40 @@
+program lotto;
+
+type
+  Ziehung = record
+    Datum: String;
+    Nums: Array[0..6] of Integer;
+  end;
+
+var
+  f: File of Ziehung;
+
+procedure gen_data();
+var
+  dates: Array[0..3] of String = (
+    '10.10.10',
+    '11.11.11',
+    '12.12.12',
+    '13.12.13');
+  i, j: Integer;
+  z: Ziehung;
+
+begin
+  Randomize;
+  Rewrite(f);
+  Seek(f, FileSize(f));
+  for i := 0 to 3 do
+  begin
+    for j := 0 to 6 do
+    begin
+      z.Nums[i] := Random(9);
+    end;
+    z.Datum := dates[i];
+    Write(f, z);
+  end;
+end;
+
+begin
+  Assign(f, 'ziehung');
+  gen_data;
+end.
\ No newline at end of file
diff --git a/file/lotto2.pas b/file/lotto2.pas
new file mode 100644
index 0000000..853651a
--- /dev/null
+++ b/file/lotto2.pas
@@ -0,0 +1,38 @@
+program lotto2;
+
+type
+  Ziehung = record
+    Datum: String;
+    Nums: Array[0..6] of Integer;
+  end;
+
+var
+  f: File of Ziehung;
+  sin: String;
+
+procedure get_for_date(date: String);
+var
+  z: Ziehung;
+  i: Integer;
+begin
+    while not EOF(f) do
+    begin
+      Read(f, z);
+      if (z.Datum = date) then
+      begin
+        Writeln('Results for ', date);
+        for i := 0 to 6 do
+          Write(z.Nums[i], ' ');
+        Writeln;
+      end;
+    end;
+end;
+
+begin
+  Assign(f, 'ziehung');
+  Reset(f);
+  Write('Date: ');
+  ReadLn(sin);
+  get_for_date(sin);
+  Close(f);
+end.
\ No newline at end of file
diff --git a/lib/linkedlist.pas b/lib/linkedlist.pas
new file mode 100644
index 0000000..b5efe43
--- /dev/null
+++ b/lib/linkedlist.pas
@@ -0,0 +1,112 @@
+unit linkedlist;
+
+interface
+type
+  link = ^node;
+  node = record
+    prev : link;
+    next : link;
+    value : pointer;
+  end;
+  list_obj = record
+    alement : link;
+    zlement : link;
+  end;
+
+function list_init : list_obj;
+function list_get(li : list_obj; i : Integer) : pointer;
+procedure list_push(li : list_obj; p : pointer);
+function list_pop(li : list_obj) : pointer;
+function list_length(li : list_obj) : Integer;
+function list_first(li : list_obj) : pointer;
+function list_empty(li : list_obj) : Boolean;
+
+implementation
+
+function list_init: list_obj;
+begin
+  list_init.alement := GetMem(SizeOf(node));
+  list_init.zlement := GetMem(SizeOf(node));
+  list_init.zlement^.prev := list_init.alement;
+  list_init.zlement^.next := list_init.zlement;
+  list_init.alement^.next := list_init.zlement;
+  list_init.alement^.prev := list_init.alement;
+end;
+
+function list_get(li: list_obj; i: Integer) : pointer;
+var
+  j : Integer;
+  r : link;
+begin
+  list_get := nil;
+  if list_length(li) > i then
+  begin
+    r := li.alement;
+    for j := 0 to i do
+    begin
+      r := r^.next;
+    end;
+    list_get := r^.value;
+  end;
+end;
+
+procedure list_push(li: list_obj; p: pointer);
+var
+  t : link;
+begin
+  t := GetMem(SizeOf(node));
+  t^.next := li.zlement;
+  t^.value := p;
+  t^.prev := li.zlement^.prev;
+  li.zlement^.prev^.next := t;
+  li.zlement^.prev := t;
+end;
+
+function list_pop(li : list_obj) : pointer;
+var
+  t : link;
+begin
+  t := li.zlement^.prev;
+  li.zlement^.prev := t^.prev;
+  li.zlement^.prev^.next := li.zlement;
+  list_pop := t^.value;
+  FreeMem(t);
+end;
+
+function list_length(li : list_obj) : Integer;
+var
+  i : Integer;
+  t : link;
+begin
+  i := 0;
+  t := li.alement;
+  while t^.next <> li.zlement do
+  begin
+    t := t^.next;
+    i := i + 1;
+  end;
+  list_length := i;
+end;
+
+function list_first(li : list_obj) : pointer;
+var
+  t : link;
+begin
+  t := li.alement^.next;
+  li.alement^.next := t^.next;
+  t^.next^.prev := li.alement;
+  list_first := t^.value;
+  FreeMem(t);
+end;
+
+function list_empty(li : list_obj) : Boolean;
+begin
+  if li.alement^.next = li.zlement then
+    list_empty := True
+  else
+    list_empty := False;
+end;
+
+begin
+  { Main Body }
+end.
\ No newline at end of file
diff --git a/lib/queue.pas b/lib/queue.pas
new file mode 100644
index 0000000..94845b1
--- /dev/null
+++ b/lib/queue.pas
@@ -0,0 +1,75 @@
+unit queue;
+
+interface
+type
+  fixed_string = String[20];
+  link = ^node;
+  node = record
+    data : fixed_string;
+    next : link;
+    prev : link
+  end;
+  queue_obj = record
+    alement : link;
+    zlement : link;
+  end;
+procedure enqueue(q : queue_obj; v: fixed_string);
+function dequeue(q : queue_obj) : fixed_string;
+function is_empty(q : queue_obj) : Boolean;
+function init_queue: queue_obj;
+
+implementation
+
+procedure enqueue(q : queue_obj; v: fixed_string);
+var
+  t : link;
+begin
+  t := GetMem(SizeOf(node));
+  t^.data := v;
+  t^.prev := q.zlement^.prev;
+  t^.prev^.next := t;
+  q.zlement^.prev := t;
+  t^.next := q.zlement;
+end;
+
+function dequeue(q : queue_obj): fixed_string;
+var
+  t: link;
+begin
+  if is_empty(q) = false then
+  begin
+    t := q.alement^.next;
+    dequeue := t^.data;
+    q.alement^.next := t^.next;
+    FreeMem(t);
+  end;
+end;
+
+function is_empty(q : queue_obj): Boolean;
+begin
+  if q.zlement^.prev = q.alement then
+    is_empty := true
+  else
+    is_empty := false;
+  if q.alement^.next = q.zlement then
+    is_empty := true;
+end;
+
+function init_queue: queue_obj;
+
+var
+  q : queue_obj;
+
+begin
+  q.alement := GetMem(SizeOf(node));
+  q.zlement := GetMem(SizeOf(node));
+  q.alement^.next := q.zlement;
+  q.alement^.prev := q.alement;
+  q.zlement^.next := q.zlement;
+  q.zlement^.prev := q.alement;
+  init_queue := q;
+end;
+
+begin
+{ Main Body }
+end.
\ No newline at end of file
diff --git a/lib/stack.pas b/lib/stack.pas
new file mode 100644
index 0000000..c3a2107
--- /dev/null
+++ b/lib/stack.pas
@@ -0,0 +1,72 @@
+unit stack;
+
+interface
+type
+  link = ^node;
+  fixed_string = String[20];
+  node = record
+    data : fixed_string;
+    next : link
+  end;
+  stack_obj = record
+    alement : link;
+    zlement : link
+  end;
+procedure push(s: stack_obj;v: fixed_string);
+function pop(s: stack_obj) : fixed_string;
+function top(s: stack_obj) : fixed_string;
+function is_empty(s: stack_obj) : Boolean;
+function init_stack : stack_obj;
+
+implementation
+
+procedure push(s: stack_obj; v: fixed_string);
+var
+  t : link;
+begin
+  t := GetMem(SizeOf(node));
+  t^.data := v;
+  t^.next := s.alement^.next;
+  s.alement^.next := t;
+end;
+
+function pop(s: stack_obj): fixed_string;
+var
+  t: link;
+begin
+  if is_empty(s) = false then
+  begin
+    t := s.alement^.next;
+    s.alement^.next := t^.next;
+    pop := t^.data;
+    FreeMem(t);
+  end;
+end;
+
+function top(s: stack_obj): fixed_string;
+begin
+  top := s.alement^.next^.data;
+end;
+
+function is_empty(s: stack_obj): Boolean;
+begin
+  if s.alement^.next = s.zlement then
+    is_empty := true
+  else
+    is_empty := false;
+end;
+
+function init_stack: stack_obj;
+var
+  s : stack_obj;
+begin
+  s.alement := GetMem(SizeOf(node));
+  s.zlement := GetMem(SizeOf(node));
+  s.alement^.next := s.zlement;
+  s.zlement^.next := s.zlement;
+  init_stack := s;
+end;
+
+begin
+{ Main Body }
+end.
\ No newline at end of file
diff --git a/lib/utils.pas b/lib/utils.pas
new file mode 100644
index 0000000..d2b6e3a
--- /dev/null
+++ b/lib/utils.pas
@@ -0,0 +1,66 @@
+unit utils;
+
+interface
+procedure calc_time(disttot : integer);
+procedure graph_init;
+procedure draw_hotel(x, y, scale : integer; hlabel: String);
+function getXSize : Integer;
+function getYSize : Integer;
+procedure draw_way(xs, ys, xt, yt, scale : Integer);
+
+implementation
+
+uses
+  crt,
+  Graph;
+
+procedure calc_time(disttot : integer);
+{ Calculate the time needed for the way and print it. }
+var
+  velocity : integer;
+  time : extended;
+begin
+      Write('Velocity (km/h): ');
+      ReadLn(velocity);
+      time := (disttot / velocity);
+      WriteLn('Estimated Time: ', time: 10: 2, ' hours');
+end;
+
+procedure draw_hotel(x, y, scale : integer; hlabel: String);
+begin
+  MoveTo(x, y);
+  OutTextXY((2*scale+x-20*scale), (y-20*scale), hlabel);
+  MoveRel(20*scale, 0);
+  LineRel(0, -40*scale);
+  LineRel(-20*scale, -20*scale);
+  LineRel(-20*scale, 20*scale);
+  LineRel(0, 40*scale);
+  LineRel(40*scale, 0);
+  MoveTo(x, y);
+end;
+
+procedure draw_way(xs, ys, xt, yt, scale : Integer);
+begin
+  Line(xs, ys, xt, yt);
+end;
+
+procedure graph_init;
+var
+  gdriver, gmode : Integer;
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+end;
+
+function getXSize : Integer;
+begin
+  getXSize := GetMaxX;
+end;
+
+function getYSize : Integer;
+begin
+  getYSize := GetMaxY;
+end;
+
+begin
+end.
\ No newline at end of file
diff --git a/test/baloon.pas b/test/baloon.pas
new file mode 100644
index 0000000..c34bb1c
--- /dev/null
+++ b/test/baloon.pas
@@ -0,0 +1,34 @@
+program baloon;
+
+uses
+  crt,
+  Graph;
+
+procedure draw_ba(x, y : Integer; color : word);
+begin
+  SetColor(color);
+  SetFillStyle(1, color);
+  Circle(x, y, 100);
+  FloodFill(x, y, color);
+end;
+
+var
+  gdriver,
+  gmode,
+  xsize,
+  ysize : Integer;
+
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  MoveTo(Round(xsize/2), Round(ysize/2));
+  draw_ba(Round(xsize/2), Round(ysize/2), green);
+  draw_ba(Round(xsize/2)-60, Round(ysize/2)+60, red);
+  draw_ba(Round(xsize/2)+40, Round(ysize/2), blue);
+  draw_ba(Round(xsize/2), Round(ysize/2)-100, yellow);
+  draw_ba(Round(xsize/2)-100, Round(ysize/2)-80, green);
+  ReadKey;
+  CloseGraph;
+end.
\ No newline at end of file
diff --git a/test/big_array.pas b/test/big_array.pas
index 1000dda..d5fe0aa 100644
--- a/test/big_array.pas
+++ b/test/big_array.pas
@@ -4,18 +4,19 @@ uses dateutils, sysutils;
 
 type
   tup = record
-    num : integer;
-    sq : integer;
+    num : longint;
+    sq : longint;
   end;
 
 var
-  a : array[0..10000] of tup;
+  a : array[0..20000] of tup;
 
 procedure fill_array;
+{ Fills the array with ints and their squares. }
 var
-  i: integer;
+  i: longint;
 begin
-  for i := 0 to 10000 do
+  for i := 0 to 20000 do
   begin
     a[i].num := i;
     a[i].sq := i*i;
@@ -23,26 +24,31 @@ begin
 end;
 
 procedure do_something(arr: array of tup);
+{ Alters one element of the array passed by value }
 begin
   arr[0].num := 1;
 end;
 
 procedure do_something_ref(var arr: array of tup);
+{ Alters one element of the array passed by reference. }
 begin
-  arr[2].num := 1;
+  arr[0].num := 1;
 end;
 
 procedure measurement;
+{ Measures the time it takes for calling a function with
+  an big array as argument by reference vs by value a million
+  times. }
 var
-  i : integer;
+  i : longint;
   time : TdateTime;
 begin
   time := Timeof(NOW);
-  for i := 1 to 10000 do
+  for i := 1 to 1000000 do
     do_something(a);
   WriteLn('By Value', MilliSecondSpan(time, Timeof(now)):4);
   time := Timeof(NOW);
-  for i := 1 to 10000 do
+  for i := 1 to 1000000 do
     do_something_ref(a);
   WriteLn('By Reference: ', MilliSecondSpan(time, Timeof(now)):4);
 end;
diff --git a/test/egg.pas b/test/egg.pas
new file mode 100644
index 0000000..faa02ee
--- /dev/null
+++ b/test/egg.pas
@@ -0,0 +1,29 @@
+program egg;
+
+uses
+  crt,
+  Graph;
+
+var
+  gdriver,
+  gmode,
+  xsize,
+  ysize, x, y, i : Integer;
+
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  SetColor(White);
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  MoveTo(Round(xsize/2), Round(ysize/2));
+  Ellipse(Round(xsize/2), Round(ysize/2), 0, 360, 100, 160);
+  SetColor(Black);
+  Ellipse(Round(xsize/2), Round(ysize/2), 0, 180, 100, 160);
+  SetColor(White);
+  Ellipse(Round(xsize/2), Round(ysize/2), 0, 180, 100, 110);
+  SetFillStyle(1, White);
+  FloodFill(Round(xsize/2), Round(ysize/2), White);
+  ReadKey;
+  CloseGraph;
+end.
\ No newline at end of file
diff --git a/test/ellipsegraph.pas b/test/ellipsegraph.pas
new file mode 100644
index 0000000..7a5ef42
--- /dev/null
+++ b/test/ellipsegraph.pas
@@ -0,0 +1,22 @@
+program ellipsegraph;
+
+uses
+  crt,
+  Graph;
+
+var
+  gdriver,
+  gmode,
+  xsize,
+  ysize : Integer;
+
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  SetColor(green);
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  FillEllipse(Round(xsize/2), Round(ysize/2), 500, 100);
+  ReadKey;
+  CloseGraph;
+end.
\ No newline at end of file
diff --git a/test/fib.pas b/test/fib.pas
new file mode 100644
index 0000000..904ed66
--- /dev/null
+++ b/test/fib.pas
@@ -0,0 +1,23 @@
+program fib;
+
+procedure fibit;
+var
+  a, b, c: QWord;
+  i : Integer;
+
+begin
+  a := 1;
+  b := 1;
+  c := 1;
+  for i := 0 to 90 do
+  begin
+    c := b;
+    b := a + b;
+    a := c;
+    WriteLn(b);
+  end;
+end;
+
+begin
+  fibit;
+end.
\ No newline at end of file
diff --git a/test/housegraphics.pas b/test/housegraphics.pas
new file mode 100644
index 0000000..f8103ac
--- /dev/null
+++ b/test/housegraphics.pas
@@ -0,0 +1,29 @@
+program housegraphics;
+
+uses
+  crt,
+  Graph;
+
+var
+  gdriver, gmode, xsize, ysize, scale : Integer;
+
+begin
+  scale := 5;
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  SetColor(green);
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  MoveTo(Round(xsize/2), Round(ysize/2));
+  MoveRel(20*scale, 0);
+  LineRel(0, -40*scale);
+  LineRel(-20*scale, -20*scale);
+  LineRel(-20*scale, 20*scale);
+  LineRel(0, 40*scale);
+  LineRel(40*scale, -40*scale);
+  LineRel(-40*scale, 0);
+  LineRel(40*scale, 40*scale);
+  LineRel(-40*scale, 0);
+  ReadKey();
+  CloseGraph();
+end.
\ No newline at end of file
diff --git a/test/linkedtest.pas b/test/linkedtest.pas
new file mode 100644
index 0000000..08be08c
--- /dev/null
+++ b/test/linkedtest.pas
@@ -0,0 +1,45 @@
+program linkedtest;
+
+uses
+  linkedlist in '../lib/linkedlist.pas';
+
+type
+  fixedstr = String;
+  strptr = ^fixedstr;
+
+function val_gen(val : fixedstr) : strptr;
+begin
+  val_gen := GetMem(SizeOf(fixedstr));
+  val_gen^ := val;
+end;
+
+function val_get(ptr : pointer) : fixedstr;
+var
+  t_ptr : strptr;
+begin
+  t_ptr := strptr(ptr);
+  val_get := t_ptr^;
+  FreeMem(t_ptr);
+end;
+
+var
+  li : list_obj;
+  i : Integer;
+
+begin
+  li := list_init;
+  list_push(li, val_gen('Hello World'));
+  list_push(li, val_gen('This is the pointers value'));
+  list_push(li, val_gen('A third string'));
+  list_push(li, val_gen('AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'));
+  list_push(li, val_gen('Stringent'));
+  list_push(li, val_gen('Whatisthis'));
+  list_push(li, val_gen('No fun anymore.'));
+  list_push(li, val_gen('AA'));
+  list_push(li, val_gen('Stackedey-Stack-Stack'));
+  WriteLn();
+  for i := 0 to list_length(li)-1 do
+    WriteLn(strptr(list_get(li, i))^);
+  WriteLn();
+  WriteLn('list_length: ', list_length(li));
+end.
\ No newline at end of file
diff --git a/test/points.pas b/test/points.pas
new file mode 100644
index 0000000..ab3629f
--- /dev/null
+++ b/test/points.pas
@@ -0,0 +1,31 @@
+program points;
+
+uses
+  crt,
+  Graph;
+
+var
+  gdriver,
+  gmode,
+  xsize,
+  ysize,
+  width,
+  i, j, k : Integer;
+
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  SetColor(green);
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  width := Round(xsize/GetMaxColor());
+  MoveTo(Round(xsize/2), Round(ysize/2));
+  for i := 0 to Round(xsize/width) do
+    for k := 0 to width do
+      for j := 0 to ysize do
+        begin
+          PutPixel((i*width)+k, j, i);
+        end;
+  ReadKey();
+  CloseGraph();
+end.
\ No newline at end of file
diff --git a/test/queuetest.pas b/test/queuetest.pas
new file mode 100644
index 0000000..a52a583
--- /dev/null
+++ b/test/queuetest.pas
@@ -0,0 +1,24 @@
+program queuetest;
+
+uses
+  queue in '../lib/queue.pas';
+
+var
+  qu, qe : queue_obj;
+
+begin
+  qu := init_queue;
+  qe := init_queue;
+  enqueue(qu, 'Hello');
+  enqueue(qu, 'World');
+  enqueue(qu, 'How');
+  enqueue(qe, 'Another queue');
+  enqueue(qu, 'Are');
+  enqueue(qu, 'You');
+  enqueue(qu, '?');
+  while is_empty(qu) = false do
+  begin
+    WriteLn(dequeue(qu));
+  end;
+  WriteLn(dequeue(qe));
+end.
\ No newline at end of file
diff --git a/test/recordtest.pas b/test/recordtest.pas
new file mode 100644
index 0000000..10ad7a9
--- /dev/null
+++ b/test/recordtest.pas
@@ -0,0 +1,8 @@
+program recordtest;
+
+var
+  iptr : ^Integer;
+begin
+  while True do
+    new(iptr);
+end.
\ No newline at end of file
diff --git a/test/spiralgraph.pas b/test/spiralgraph.pas
new file mode 100644
index 0000000..0cd54cc
--- /dev/null
+++ b/test/spiralgraph.pas
@@ -0,0 +1,39 @@
+program ellipsegraph;
+
+uses
+  crt,
+  Graph;
+
+var
+  gdriver,
+  gmode,
+  xsize,
+  ysize, x, y, i : Integer;
+
+procedure draw_spiral(color: word; rotation: Integer);
+var
+  i : Integer;
+begin
+for i := 0 to 1500 do
+    begin
+      x := Round(xsize/2)+Round(i*sin(2*i+rotation)/2);
+      y := Round(ysize/2)+Round(i*cos(2*i+rotation)/2);
+      PutPixel(x, y, color);
+    end;
+end;
+
+begin
+  DetectGraph(gdriver, gmode);
+  InitGraph(gdriver, gmode, '');
+  SetColor(green);
+  xsize := GetMaxX;
+  ysize := GetMaxY;
+  MoveTo(Round(xsize/2), Round(ysize/2));
+  while True do
+  begin
+    for i := 0 to 360 do
+      draw_spiral(i, Round(i/2));
+  end;
+  ReadKey;
+  CloseGraph;
+end.
\ No newline at end of file
diff --git a/test/stacktest.pas b/test/stacktest.pas
new file mode 100644
index 0000000..b3bc8bb
--- /dev/null
+++ b/test/stacktest.pas
@@ -0,0 +1,25 @@
+program stacktest;
+
+uses
+  stack in '../lib/stack.pas';
+
+var
+  st, st1 : stack_obj;
+
+begin
+  st := init_stack;
+  st1 := init_stack;
+  push(st, 'Hello');
+  push(st1, 'New stack');
+  push(st, 'World');
+  push(st1, 'With new values');
+  push(st, 'How');
+  push(st, 'Are');
+  push(st, 'You');
+  push(st, '?');
+  while is_empty(st) = false do
+  begin
+    WriteLn(pop(st));
+  end;
+  WriteLn(pop(st1));
+end.
\ No newline at end of file
diff --git a/test/utilstest.pas b/test/utilstest.pas
new file mode 100644
index 0000000..abb7c56
--- /dev/null
+++ b/test/utilstest.pas
@@ -0,0 +1,13 @@
+program utilstest;
+
+uses
+  crt,
+  Graph,
+  utils in '../lib/utils.pas';
+
+begin
+  graph_init;
+  draw_hotel(getXSize >> 1, getYSize >> 1, 1, 'H1');
+  draw_way(60, 60, 200, 200, 1);
+  ReadKey;
+end.
\ No newline at end of file