diff --git a/20231123/aufgabe-3.c b/20231123/aufgabe-3.c
index 5b0cb23fdd5ee15a4403808c18d2104ed49caf3f..2bcd5e63a71f212b7243d1f7d9c92406d1e41e77 100644
--- a/20231123/aufgabe-3.c
+++ b/20231123/aufgabe-3.c
@@ -1,62 +1,10 @@
-#include <gtk/gtk.h>
+#include <stdio.h>
 
-#define WIDTH 320
-#define HEIGHT 240
-
-double t = 0.0;
-double dt = 0.2;
-
-int r = 5;
-
-double x = 10;
-double y = 200;
-double vx = 20;
-double vy = -60;
-double g = 9.81;
-
-gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+int main (void)
 {
-  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
-
-  gdk_cairo_set_source_rgba (c, &blue);
-  cairo_arc (c, x, y, r, 0, 2 * G_PI);
-  cairo_fill (c);
-
-  return FALSE;
-}
-
-gboolean timer (GtkWidget *widget)
-{
-  t += dt;
-  x += vx * dt;
-  y += vy * dt;
-  vx = vx;
-  vy = 0.5 * g * (t * t);
-  if (y + r >= HEIGHT)
-    vy = -vy * 0.9;
-  if (x + r >= WIDTH)
-    vx = -vx * 0.9;
-  if (x - r <= 0)
-    vx = -vx * 0.9;
-  gtk_widget_queue_draw_area (widget, 0, 0, WIDTH, HEIGHT);
-  g_timeout_add (50, (GSourceFunc) timer, widget);
-  return FALSE;
-}
-
-int main (int argc, char **argv)
-{
-  gtk_init (&argc, &argv);
-
-  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-  gtk_widget_show (window);
-  gtk_window_set_title (GTK_WINDOW (window), "Hello");
-  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
-
-  GtkWidget *drawing_area = gtk_drawing_area_new ();
-  gtk_widget_show (drawing_area);
-  gtk_container_add (GTK_CONTAINER (window), drawing_area);
-  gtk_widget_set_size_request (drawing_area, WIDTH, HEIGHT);
-
-  gtk_main ();
-  return 0;
+  char buffer[100];
+  fgets (buffer, 100, stdin);
+  for (char *p = buffer; *p; p++)
+    printf ("%02x", *p);
+  printf ("\n");
 }
diff --git a/20231123/hp-20231123.pdf b/20231123/hp-20231123.pdf
index 721a2fe874f61111db02c6f2e18d0b937123a3ec..44bf8dfc4de090990e3d4061099d2bb3a366ec7f 100644
Binary files a/20231123/hp-20231123.pdf and b/20231123/hp-20231123.pdf differ
diff --git a/20231123/hp-20231123.tex b/20231123/hp-20231123.tex
index 1975ab620ce0aa95de87e6b30f9be90c46c309e7..eda7fca5dcfed48f0854d68b34d6d1fd01c45ed8 100644
--- a/20231123/hp-20231123.tex
+++ b/20231123/hp-20231123.tex
@@ -59,6 +59,7 @@
         \color{medgreen}
         \item[4.5] Byte-Reihenfolge -- Endianness
         \item[4.6] Binärdarstellung negativer Zahlen
+        \color{orange}
         \item[4.7] Binärdarstellung von Gleitkommazahlen
         \color{red}
         \item[4.8] Speicherausrichtung -- Alignment
@@ -357,7 +358,7 @@
       $m - e - 1$ Bits für die Mantisse.
   \end{itemize}
 
-%  \pause
+  \pause
   \begin{picture}(0,0)
     \color{red}
     \put(1.95,0.65){\makebox(0,0){\tikz{\draw(0,0)--(0.5,0.25);}}}
@@ -395,7 +396,9 @@
       Beim Bilden von Differenzquotienten\\
       verliert man notwendigerweise an Präzision!\\
       \textarrow\ Die Differenzen sehr sorgfältig auswählen.\\
-      \textarrow\ Am besten gar nicht ableiten, sondern integrieren.
+      \textarrow\ Am besten gar nicht ableiten, sondern integrieren.\\
+      \pause
+      (Trick: Ableiten über Fourier-Transformationen)
   \end{itemize}
 
 \end{frame}
diff --git a/20231123/hp-musterloesung-20231123.pdf b/20231123/hp-musterloesung-20231123.pdf
index 94f0e422f0917d55a875b58ff437e692bec61a86..1782abc389d59c3de4999c95356c99baf45cd738 100644
Binary files a/20231123/hp-musterloesung-20231123.pdf and b/20231123/hp-musterloesung-20231123.pdf differ
diff --git a/20231123/hp-uebung-20231123.pdf b/20231123/hp-uebung-20231123.pdf
index 6beb192a0a95fd8864f56b5dac454eb0f06a3e18..87e567d5d1807689d3b6054057c15e9b6781cb3a 100644
Binary files a/20231123/hp-uebung-20231123.pdf and b/20231123/hp-uebung-20231123.pdf differ
diff --git a/20231123/hp-uebung-20231123.tex b/20231123/hp-uebung-20231123.tex
index 5ec4c23a85d0cc054e38ed08b2d28df9af5104cc..4c1804b5946ddb605bb6ade266c19fdee173a58a 100644
--- a/20231123/hp-uebung-20231123.tex
+++ b/20231123/hp-uebung-20231123.tex
@@ -147,7 +147,7 @@
 
   \exercise{Hexdumps}
 
-  Das folgende Programm (\gitfile{hp}{2023ws/20231123}{aufgabe-4.c}) liest
+  Das folgende Programm (\gitfile{hp}{2023ws/20231123}{aufgabe-3.c}) liest
   einen String ein und gibt die ASCII-Werte der Buchstaben hexadezimal aus.
   (Anders als z.\,B.\ \lstinline{scanf()}
   akzeptiert die Funktion \lstinline{fgets()} zum Lesen von Strings auch Leerzeichen,