Vorbereitung 5.12.2019

20191205/aufgabe-1.c

+#include <stdio.h>
+#include <string.h>
+
+void delete_char_from_string (char *s, int pos)
+{
+  for (int i = strlen (s) - 1; i > pos; i--)
+    s[i - 1] = s[i];
+}
+
+int main (void)
+{
+  char test[] = "Hochschule Boochum";
+  delete_char_from_string (test, 12);
+  printf ("%s\n", test);
+  return 0;
+}

20191205/aufgabe-2.c

+#include <stdio.h>
+
+int main (void)
+{
+  char buffer[100];
+  fgets (buffer, 100, stdin);
+  for (char *p = buffer; *p; p++)
+    printf ("%02x", *p);
+  printf ("\n");
+}

20191205/gtk-1.c

+#include <gtk/gtk.h>
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-10.c

+#include <gtk/gtk.h>
+
+#define WIDTH 320
+#define HEIGHT 240
+
+double t = 0.0;
+
+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)
+{
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_rectangle (c, x + vx * t, y + vy * t + 0.5 * g * t * t, 10, 10);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += 0.05;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/gtk-11.c

+#include <gtk/gtk.h>
+
+#define WIDTH 320
+#define HEIGHT 240
+
+double t = 0.0;
+double dt = 0.05;
+
+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)
+{
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_rectangle (c, x, y, 10, 10);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += dt;
+  x += vx * dt;
+  y += vy * dt;
+  vy += g * dt;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/gtk-12.c

+#include <gtk/gtk.h>
+
+#define WIDTH 320
+#define HEIGHT 240
+
+double t = 0.0;
+double dt = 0.05;
+
+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)
+{
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_rectangle (c, x, y, 10, 10);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += dt;
+  x += vx * dt;
+  y += vy * dt;
+  vy += g * dt;
+  if (y >= HEIGHT)
+    vy = -vy;
+  if (x >= WIDTH)
+    vx = -vx;
+  if (x <= 0)
+    vx = -vx;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/gtk-13.c

+#include <gtk/gtk.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)
+{
+  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;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += dt;
+  x += vx * dt;
+  y += vy * dt;
+  vy += g * dt;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/gtk-2.c

+#include <gtk/gtk.h>
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-3.c

+#include <gtk/gtk.h>
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+  GtkWidget *button = gtk_button_new_with_label ("Quit");
+  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_container_add (GTK_CONTAINER (window), button);
+  gtk_widget_show (button);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-4.c

+#include <gtk/gtk.h>
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+
+  GtkWidget *button = gtk_button_new_with_label ("Quit");
+  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_container_add (GTK_CONTAINER (vbox), button);
+
+  GtkWidget *drawing_area = gtk_drawing_area_new ();
+  gtk_container_add (GTK_CONTAINER (vbox), drawing_area);
+
+  gtk_widget_show (drawing_area);
+  gtk_widget_show (button);
+  gtk_widget_show (vbox);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-5.c

+#include <gtk/gtk.h>
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+
+  GtkWidget *button = gtk_button_new_with_label ("Quit");
+  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_container_add (GTK_CONTAINER (vbox), button);
+
+  GtkWidget *drawing_area = gtk_drawing_area_new ();
+  gtk_container_add (GTK_CONTAINER (vbox), drawing_area);
+  gtk_widget_set_size_request (drawing_area, 100, 100);
+
+  gtk_widget_show (drawing_area);
+  gtk_widget_show (button);
+  gtk_widget_show (vbox);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-6.c

+#include <gtk/gtk.h>
+
+gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+{
+  GdkRGBA red = { 1.0, 0.0, 0.0, 0.8 };
+  GdkRGBA yellow = { 1.0, 1.0, 0.0, 0.6 };
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 0.4 };
+
+  gdk_cairo_set_source_rgba (c, &red);
+  cairo_rectangle (c, 10, 10, 60, 40);
+  cairo_fill (c);
+
+  gdk_cairo_set_source_rgba (c, &yellow);
+  cairo_arc (c, 65, 50, 30, 0, 2 * G_PI);
+  cairo_fill (c);
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_move_to (c, 10, 70);
+  cairo_line_to (c, 70, 70);
+  cairo_line_to (c, 40, 18);
+  cairo_close_path (c);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+
+  GtkWidget *button = gtk_button_new_with_label ("Quit");
+  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_container_add (GTK_CONTAINER (vbox), button);
+
+  GtkWidget *drawing_area = gtk_drawing_area_new ();
+  gtk_container_add (GTK_CONTAINER (vbox), drawing_area);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+  gtk_widget_set_size_request (drawing_area, 100, 100);
+
+  gtk_widget_show (drawing_area);
+  gtk_widget_show (button);
+  gtk_widget_show (vbox);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-7.c

+#include <stdio.h>
+#include <gtk/gtk.h>
+
+gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+{
+  GdkRGBA red = { 1.0, 0.0, 0.0, 0.8 };
+  GdkRGBA yellow = { 1.0, 1.0, 0.0, 0.6 };
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 0.4 };
+
+  gdk_cairo_set_source_rgba (c, &red);
+  cairo_rectangle (c, 10, 10, 60, 40);
+  cairo_fill (c);
+
+  gdk_cairo_set_source_rgba (c, &yellow);
+  cairo_arc (c, 65, 50, 30, 0, 2 * G_PI);
+  cairo_fill (c);
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_move_to (c, 10, 70);
+  cairo_line_to (c, 70, 70);
+  cairo_line_to (c, 40, 18);
+  cairo_close_path (c);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean button_press (GtkWidget *widget, GdkEventButton *e, gpointer data)
+{
+  printf ("button %d pressed at (%lf, %lf)\n", e->button, e->x, e->y);
+  return FALSE;
+}
+
+gboolean key_press (GtkWidget *widget, GdkEventKey *e, gpointer data)
+{
+  printf ("key '%c' (%d) pressed\n", e->keyval, e->keyval);
+  return FALSE;
+}
+
+int main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_title (GTK_WINDOW (window), "Hello");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+
+  GtkWidget *button = gtk_button_new_with_label ("Quit");
+  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
+  gtk_container_add (GTK_CONTAINER (vbox), button);
+
+  GtkWidget *drawing_area = gtk_drawing_area_new ();
+  gtk_container_add (GTK_CONTAINER (vbox), drawing_area);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+  gtk_widget_set_size_request (drawing_area, 100, 100);
+  gtk_widget_add_events (drawing_area, GDK_BUTTON_PRESS_MASK);
+  g_signal_connect (drawing_area, "button_press_event", G_CALLBACK (button_press), NULL);
+
+  gtk_widget_add_events (window, GDK_KEY_PRESS_MASK);
+  g_signal_connect (window, "key_press_event", G_CALLBACK (key_press), NULL);
+
+  gtk_widget_show (drawing_area);
+  gtk_widget_show (button);
+  gtk_widget_show (vbox);
+  gtk_widget_show (window);
+  gtk_main ();
+  return 0;
+}

20191205/gtk-8.c

+#include <gtk/gtk.h>
+
+#define WIDTH 320
+#define HEIGHT 240
+
+double t = 0.0;
+
+double vx = 40;
+double vy = 30;
+
+gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+{
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_rectangle (c, 10 + vx * t, 10 + vy * t, 10, 10);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += 0.05;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/gtk-9.c

+#include <gtk/gtk.h>
+
+#define WIDTH 320
+#define HEIGHT 240
+
+double t = 0.0;
+
+double x = 10;
+double y = 10;
+double vx = 40;
+double vy = 30;
+double g = 9.81;
+
+gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+{
+  GdkRGBA blue = { 0.0, 0.5, 1.0, 1.0 };
+
+  gdk_cairo_set_source_rgba (c, &blue);
+  cairo_rectangle (c, x + vx * t, y + vy * t - 0.5 * g * t * t, 10, 10);
+  cairo_fill (c);
+
+  return FALSE;  /* TRUE to stop other handlers from being invoked for the event.
+                    FALSE to propagate the event further. */
+}
+
+gboolean timer (GtkWidget *widget)
+{
+  t += 0.05;
+  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);
+  g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+
+  g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+
+  gtk_main ();
+  return 0;
+}

20191205/hp-20191205.tex

+% hp-20191205.pdf - Lecture Slides on Low-Level Programming
+% Copyright (C) 2012, 2013, 2015, 2016, 2017, 2018, 2019  Peter Gerwinski
+%
+% This document is free software: you can redistribute it and/or
+% modify it either under the terms of the Creative Commons
+% Attribution-ShareAlike 3.0 License, or under the terms of the
+% GNU General Public License as published by the Free Software
+% Foundation, either version 3 of the License, or (at your option)
+% any later version.
+%
+% This document is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this document.  If not, see <http://www.gnu.org/licenses/>.
+%
+% You should have received a copy of the Creative Commons
+% Attribution-ShareAlike 3.0 Unported License along with this
+% document.  If not, see <http://creativecommons.org/licenses/>.
+
+% README: Präprozessor, Bibliotheken
+
+\documentclass[10pt,t]{beamer}
+
+\usepackage{pgslides}
+\usepackage{pdftricks}
+\usepackage{tikz}
+
+\begin{psinputs}
+  \usepackage[utf8]{inputenc}
+  \usepackage[german]{babel}
+  \usepackage[T1]{fontenc}
+  \usepackage{helvet}
+  \renewcommand*\familydefault{\sfdefault}
+  \usepackage{pstricks,pst-grad}
+\end{psinputs}
+
+\title{Hardwarenahe Programmierung}
+\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}
+\date{5.\ Dezember 2019}
+
+\begin{document}
+
+\maketitleframe
+
+\nosectionnonumber{\inserttitle}
+
+\begin{frame}
+
+  \shownosectionnonumber
+
+  \begin{itemize}
+    \item[\textbf{1}] \textbf{Einführung}
+      \hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/hp}}}
+    \item[\textbf{2}] \textbf{Einführung in C}
+    \item[\textbf{3}] \textbf{Bibliotheken}
+      \begin{itemize}
+        \color{medgreen}
+        \item[3.1] Der Präprozessor
+        \item[3.2] Bibliotheken einbinden
+        \item[3.3] Bibliotheken verwenden
+        \color{black}
+        \item[3.4] Projekt organisieren: make
+%        \vspace*{-\smallskipamount}
+%        \item[\dots]
+      \end{itemize}
+    \vspace*{-\smallskipamount}
+    \item[\textbf{4}] \textbf{Hardwarenahe Programmierung}
+    \item[\textbf{5}] \textbf{Algorithmen}
+      \begin{itemize}
+        \color{red}
+        \item[5.1] Differentialgleichungen
+        \color{black}
+        \vspace*{-0.1cm}
+        \item[\dots]
+      \end{itemize}
+    \vspace*{-\smallskipamount}
+    \item[\textbf{\dots}]
+  \end{itemize}
+
+\end{frame}
+
+\setcounter{section}{2}
+\section{Bibliotheken}
+\subsection{Der Präprozessor}
+
+\begin{frame}[fragile]
+
+  \showsection
+  \showsubsection
+
+  \lstinline{#include}: %\pause:
+  Text einbinden
+  \begin{itemize}
+%    \pause
+    \item
+      \lstinline{#include <stdio.h>}: Standard-Verzeichnisse -- Standard-Header
+%    \pause
+    \item
+      \lstinline{#include "pruzzel.h"}: auch aktuelles Verzeichnis -- eigene Header
+  \end{itemize}
+
+%  \pause
+  \bigskip
+
+  \lstinline{#define VIER 4}: Text ersetzen lassen -- Konstante definieren
+  \begin{itemize}
+%    \pause
+    \item
+      Kein Semikolon!
+%    \pause
+    \item
+      Berechnungen in Klammern setzen:\\
+      \lstinline{#define VIER (2 + 2)}
+%    \pause
+    \item
+      Konvention: Großbuchstaben
+  \end{itemize}
+
+\end{frame}
+
+\subsection{Bibliotheken einbinden}
+
+\begin{frame}[fragile]
+
+  \showsection
+  \showsubsection
+
+  Inhalt der Header-Datei: externe Deklarationen
+
+%  \pause
+  \smallskip
+  \lstinline{extern int pruzzel (const char *s);}
+
+%  \pause
+  \smallskip
+  \lstinline{extern int printf (__const char *__restrict __format, ...);}
+
+%  \pause
+  \bigskip
+  Funktion wird "`anderswo"' definiert
+  \begin{itemize}
+%    \pause
+    \item
+      separater C-Quelltext: mit an \lstinline[style=terminal]{gcc} übergeben
+%    \pause
+    \item
+      Zusammenfügen zu ausführbarem Programm durch den \newterm{Linker}
+%    \pause
+    \item
+      vorcompilierte Bibliothek: \lstinline[style=terminal]{-lfoo}\\
+%      \pause
+      = Datei \file{libfoo.a} in Standard-Verzeichnis
+  \end{itemize}
+
+\end{frame}
+
+\subsection{Bibliothek verwenden (Beispiel: GTK+)}
+
+\begin{frame}[fragile]
+
+  \showsubsection
+
+  \begin{itemize}
+    \item
+      \lstinline{#include <gtk/gtk.h>}
+%    \pause
+    \smallskip
+    \item
+      Mit \lstinline[style=cmd]{pkg-config --cflags --libs} erfährt man,\\
+      welche Optionen und Bibliotheken man an \lstinline[style=cmd]{gcc}
+      übergeben muß\alt<2->{.}{:}
+%      \pause
+      \begin{onlyenv}<1>
+        \begin{lstlisting}[style=terminal,gobble=10]
+          $ ¡pkg-config --cflags --libs gtk+-3.0¿
+          -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-
+          atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1
+          .0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/
+          include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/inc
+          lude/cairo -I/usr/include/pango-1.0 -I/usr/include/harf
+          buzz -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I
+          /usr/include/cairo -I/usr/include/pixman-1 -I/usr/inclu
+          de/freetype2 -I/usr/include/libpng16 -I/usr/include/gdk
+          -pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib
+          -2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -lgtk
+          -3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcai
+          ro-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject
+          -2.0 -lglib-2.0
+        \end{lstlisting}
+        \vspace*{-1cm}
+      \end{onlyenv}
+    \pause
+    \arrowitem
+      Compiler-Aufruf:
+      \begin{onlyenv}<2>
+        \begin{lstlisting}[style=terminal,gobble=10]
+          $ ¡gcc -Wall -O hello-gtk.c -pthread -I/usr/include/gtk-
+          3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-sp
+          i-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-g
+          nu/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/inclu
+          de/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pa
+          ngo-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.
+          0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/in
+          clude/pixman-1 -I/usr/include/freetype2 -I/usr/include/
+          libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/l
+          ibpng16 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux
+          -gnu/glib-2.0/include -lgtk-3 -lgdk-3 -lpangocairo-1.0
+          -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pix
+          buf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0-o hello-gtk¿
+        \end{lstlisting}
+        \vspace*{-1cm}
+      \end{onlyenv}
+      \begin{onlyenv}<3->
+        \begin{lstlisting}[style=terminal,gobble=10]
+          $ ¡gcc -Wall -O hello-gtk.c $(pkg-config --cflags --libs)
+                 -o hello-gtk¿
+        \end{lstlisting}
+      \end{onlyenv}
+  \end{itemize}
+  \pause[3]
+  \begin{picture}(0,0)
+    \color{red}
+    \put(6.6,-0.6){\makebox(0,0)[bl]{\tikz{\draw[-latex](0,0)--(3,1.5);}}}
+    \put(6.3,-0.7){\makebox(0,0)[t]{\shortstack{\strut Optionen:\\
+                     \strut u.\,a.\ viele Include-Verzeichnisse:\\
+                     \lstinline[style=cmd]{-I/usr/include/gtk-3.0}}}}
+    \put(10.0,-2.1){\makebox(0,0)[bl]{\tikz{\draw[-latex](0,0)--(1.5,3);}}}
+    \put(10.3,-2.2){\makebox(0,0)[t]{\shortstack{\strut Bibliotheken:\\
+                      \strut u.\,a.\ \lstinline[style=cmd]{-lgtk-3 -lcairo}}}}
+  \end{picture}
+
+\end{frame}
+
+\begin{frame}[fragile]
+
+  \showsubsection
+
+  Selbst geschriebene Funktion übergeben: \newterm{Callback}
+
+  \bigskip
+
+  \begin{lstlisting}[xleftmargin=1em]
+    gboolean draw (GtkWidget *widget, cairo_t *c, gpointer data)
+    {
+      /* Zeichenbefehle */
+      ...
+
+      return FALSE;
+    }
+  
+    ...
+
+    g_signal_connect (drawing_area, "draw", G_CALLBACK (draw), NULL);
+  \end{lstlisting}
+
+  \medskip
+
+  \begin{itemize}
+    \arrowitem 
+      GTK+ ruft immer dann, wenn es etwas zu zeichnen gibt,\\
+      die Funktion \lstinline{draw} auf.
+  \end{itemize}
+
+  \pause
+  \begin{picture}(0,0)
+    \color{red}
+    \put(5.3,4.8){\makebox(0,0)[bl]{\tikz{\draw[-latex](0,0)--(1.90,1.15);}}}
+    \put(5.0,4.7){\makebox(0,0)[t]{\shortstack{\strut repräsentiert den\\
+                    \strut Bildschirm, auf den\\
+                    \strut gezeichnet werden soll}}}
+    \pause
+    \put(9.7,5.1){\makebox(0,0)[br]{\tikz{\draw[-latex](0,0)--(-0.2,0.85);}}}
+    \put(9.7,5.0){\makebox(0,0)[t]{\shortstack{\strut optionale Zusatzinformationen\\
+                    \strut für draw(), typischerweise\\
+                    \strut ein Zeiger auf ein struct}}}
+    \put(10.0,3.5){\makebox(0,0)[tl]{\tikz{\draw[-latex](0,0)--(0.6,-1.25);}}}
+  \end{picture}
+
+\end{frame}
+
+\begin{frame}[fragile]
+
+  \showsubsection
+
+  Selbst geschriebene Funktion übergeben: \newterm{Callback}
+
+  \bigskip
+
+  \begin{lstlisting}[xleftmargin=1em]
+    gboolean timer (GtkWidget *widget)
+    {
+      /* Rechenbefehle */
+      ...
+
+      gtk_widget_queue_draw_area (widget, 0, 0, WIDTH, HEIGHT);
+      g_timeout_add (50, (GSourceFunc) timer, widget);
+      return FALSE;
+    }
+  
+    ...
+
+    g_timeout_add (50, (GSourceFunc) timer, drawing_area);
+  \end{lstlisting}
+
+  \medskip
+
+  \begin{itemize}
+    \arrowitem 
+      GTK+ ruft nach 50 Millisekunden
+      die Funktion \lstinline{timer} auf.
+  \end{itemize}
+
+  \pause
+  \begin{picture}(0,0)
+    \color{red}
+    \put(9.7,6.7){\makebox(0,0)[t]{\shortstack{\strut Dieser Bereich soll\\
+                    \strut neu gezeichnet werden.}}}
+    \put(9.7,5.7){\makebox(0,0)[tr]{\tikz{\draw[-latex](0,0)--(-0.6,-0.8);}}}
+    \pause
+    \put(4.3,3.2){\makebox(0,0)[br]{\tikz{\draw[-latex](0,0)--(-0.7,0.6);}}}
+    \put(4.3,3.1){\makebox(0,0)[t]{\shortstack{\strut In weiteren 50 Millisekunden soll\\
+                    \strut die Funktion erneut aufgerufen werden.}}}
+    \pause
+    \put(9.3,2.9){\makebox(0,0)[br]{\tikz{\draw[-latex](0,0)--(-3.3,0.9);}}}
+    \put(9.8,2.8){\makebox(0,0)[t]{\shortstack{\strut Explizite Typumwandlung\\
+                    \strut eines Zeigers (später)}}}
+  \end{picture}
+
+\end{frame}
+
+\section{Algorithmen}
+\subsection{Differentialgleichungen}
+
+\begin{frame}[fragile]
+
+  \showsection
+  \showsubsection
+
+  \textbf{Beispiel 1: Gleichmäßig beschleunigte Bewegung} (Schräger Wurf)
+
+  \strut\hfill
+  \begin{minipage}{2.5cm}
+    \vspace*{0.6cm}
+    \begin{align*}
+      x'(t) &= v_x(t) \\[0.65cm]
+      y'(t) &= v_y(t) \\[0.75cm]
+      v_x'(t) &= 0 \\[0.65cm]
+      v_y'(t) &= -g
+    \end{align*}
+    \vspace*{0.0cm}
+  \end{minipage}%
+  \only<1>{\hspace*{9.49cm}}\strut
+  \only<2->{\hfill$\Rightarrow$\hfill}%
+  \begin{onlyenv}<2-8>
+    \begin{minipage}{8.3cm}
+      \begin{align*}
+        x(t) &= \int v_x(t)\,dt
+          \visible<4->{= \int v_{0x}\,dt}
+          \visible<5->{= x_0 + v_{0x}\cdot t}\\[\medskipamount]
+        y(t) &= \int v_y(t)\,dt
+          \visible<7->{= \int v_{0y} - g\cdot t\,dt}
+          \visible<8->{= y_0 + v_{0y}\cdot t
+                         - {\textstyle\frac12}gt^2}\\[\bigskipamount]
+        v_x(t) &= \int 0\,dt
+          \visible<3->{= v_{0x}} \\[\medskipamount]
+        v_y(t) &= \int -g\,dt
+          \visible<6->{= v_{0y} - g\cdot t}
+      \end{align*}
+    \end{minipage}%
+  \end{onlyenv}%
+  \begin{onlyenv}<9->
+    \begin{minipage}{3.5cm}
+      \vspace*{0.5cm}
+      \begin{lstlisting}[gobble=8,xleftmargin=0.5em]
+        ¡x += vx * dt;¿
+      \end{lstlisting}
+      \vspace{0.75cm}
+      \begin{lstlisting}[gobble=8,xleftmargin=0.5em]
+        ¡y += vy * dt;¿
+      \end{lstlisting}
+      \vspace{0.90cm}
+      \begin{lstlisting}[gobble=8,xleftmargin=0.5em]
+        ¡vx += 0 * dt;¿
+      \end{lstlisting}
+      \vspace{0.75cm}
+      \begin{lstlisting}[gobble=8,xleftmargin=0.5em]
+        ¡vy += -g * dt;¿
+      \end{lstlisting}
+    \end{minipage}%
+    \begin{minipage}{5.13cm}
+      Siehe: \file{gtk-13.c}
+    \end{minipage}
+  \end{onlyenv}%
+  \hfill\strut
+
+\end{frame}
+
+\begin{frame}[fragile]
+  \showsection
+  \showsubsection
+
+  \textbf{Beispiel 1: Gleichmäßig beschleunigte Bewegung}
+
+  \medskip
+
+  \textbf{Beispiel 2: Mathematisches Pendel}
+
+  \vspace*{-2\bigskipamount}
+
+  \begin{picture}(0,0)
+    \put(8,-6.5){\includegraphics{pendulum.pdf}}
+  \end{picture}
+
+  \begin{eqnarray*}
+    \varphi'(t) &=& \omega(t) \\[\smallskipamount]
+    \omega'(t) &=& -\frac{g}{l}\cdot\sin\varphi(t)\hspace*{7.1cm}
+  \end{eqnarray*}
+  \vspace*{-1.5\medskipamount}
+  \begin{itemize}
+    \item
+      Von Hand (analytisch):\\
+      Lösung raten (Ansatz), Parameter berechnen
+    \item
+      Mit Computer (numerisch):\\
+      Eulersches Polygonzugverfahren
+  \end{itemize}
+  \smallskip
+  \begin{lstlisting}[gobble=0]
+    phi += dt * omega;
+    omega += - dt * g / l * sin (phi);
+  \end{lstlisting}
+
+  \pause
+  \bigskip
+
+  \textbf{Beispiel 3:} Praktikumsaufgabe
+
+\end{frame}
+
+\end{document}

20191205/hp-uebung-20191205.tex

+% hp-uebung-20191205.pdf - Exercises on Low-Level Programming
+% Copyright (C) 2013, 2015, 2016, 2017, 2018, 2019  Peter Gerwinski
+%
+% This document is free software: you can redistribute it and/or
+% modify it either under the terms of the Creative Commons
+% Attribution-ShareAlike 3.0 License, or under the terms of the
+% GNU General Public License as published by the Free Software
+% Foundation, either version 3 of the License, or (at your option)
+% any later version.
+%
+% This document is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this document.  If not, see <http://www.gnu.org/licenses/>.
+%
+% You should have received a copy of the Creative Commons
+% Attribution-ShareAlike 3.0 Unported License along with this
+% document.  If not, see <http://creativecommons.org/licenses/>.
+
+% README: Löschen aus Strings, Hexdumps
+
+\documentclass[a4paper]{article}
+
+\usepackage{pgscript}
+
+\begin{document}
+
+%  \thispagestyle{empty}
+
+  \section*{Hardwarenahe Programmierung\\
+            Übungsaufgaben -- 5.\ Dezember 2019}
+
+  Diese Übung enthält Punkteangaben wie in einer Klausur.
+  Um zu "`bestehen"', müssen Sie innerhalb von 60 Minuten
+  unter Verwendung ausschließlich zugelassener Hilfsmittel
+  10 Punkte (von insgesamt \totalpoints) erreichen.
+
+  \exercise{Löschen aus Strings}
+
+  Wir betrachten das folgende Programm (\gitfile{hp}{20191205}{aufgabe-1.c}):
+  \begin{lstlisting}[style=numbered]
+    #include <stdio.h>
+    #include <string.h>
+
+    void delete_char_from_string (char *s, int pos)
+    {
+      for (int i = strlen (s) - 1; i > pos; i--)
+        s[i - 1] = s[i];
+    }
+
+    int main (void)
+    {
+      char test[] = "Hochschule Boochum";
+      delete_char_from_string (test, 12);
+      printf ("%s\n", test);
+      return 0;
+    }
+  \end{lstlisting}
+  Die Ausgabe des Programms lautet:
+  \lstinline[style=terminal]{Hochschule Bmmmmmm}
+
+  \begin{enumerate}[\quad(a)]
+    \item
+      Erklären Sie, wie die Ausgabe zustandekommt.
+      \points{3}
+%      \workspace{12}
+    \item
+      Schreiben Sie die Funktion \lstinline{delete_char_from_string()} so um,
+      daß sie aus dem String \lstinline{s} das Zeichen an der Stelle \lstinline{pos}
+      löscht.\par
+      Die Ausgabe des Programms müßte dann
+      \lstinline[style=terminal]{Hochschule Bochum} lauten.
+      \points{4}
+%      \workspace{15}
+    \item
+      Was kann passieren, wenn Sie 
+      \lstinline{char test[] = "Hochschule Boochum";} \\
+      durch
+      \lstinline{char *test = "Hochschule Boochum";}
+      ersetzen? Begründen Sie Ihre Antwort.
+      \points{2}
+%      \workspace{9}
+    \item
+      Schreiben Sie eine Funktion
+      \lstinline{void delete_from_string (char *s, int pos, int length)},
+      die \lstinline{length} Zeichen ab der Stelle \lstinline{pos}
+      aus dem String \lstinline{s} löscht,
+      \emph{indem sie die in Aufgabenteil (b) korrigierte Funktion\/}
+      \lstinline{void delete_char_from_string (char *s, int pos)}
+      \emph{wiederholt aufruft}. \par
+%      Wie schnell (Landau-Symbol in Abhängigkeit von der Länge $n$ des Strings)
+%      arbeitet diese Funktion
+%      \lstinline{delete_from_string()}?
+%      Begründen Sie Ihre Antwort.
+%      \points{3}
+      \points{2}
+%      \workspace{15}
+    \item
+      Schreiben Sie eine \emph{optimierte\/} Funktion
+      \lstinline{void quick_delete_from_string (char *s, int pos, int length)},
+      die ebenfalls \lstinline{length} Zeichen ab der Stelle \lstinline{pos}
+      aus dem String \lstinline{s} löscht,
+%      dafür aber höchstens $\mathcal{O}(n)$ an Rechenzeit benötigt.
+      aber mit einer einzigen Schleife auskommt.
+      \points{4}
+%      \workspace{15}
+  \end{enumerate}
+
+  \clearpage
+  \exercise{Hexdumps}
+
+  Das folgende Programm (\gitfile{hp}{20191205}{aufgabe-2.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,
+  und sie vermeidet Pufferüberläufe.)
+  \begin{lstlisting}[style=numbered]
+    #include <stdio.h>
+
+    int main (void)
+    {
+      char buffer[100];
+      fgets (buffer, 100, stdin);
+      for (char *p = buffer; *p; p++)
+        printf ("%02x", *p);
+      printf ("\n");
+    }
+  \end{lstlisting}
+  Beispiel: Bei der Eingabe von \lstinline[style=cmd]{Dies ist ein Test.}
+  erscheint die Ausgabe\\
+  \lstinline[style=terminal]{44696573206973742065696e20546573742e0a}.
+
+  Schreiben Sie ein Programm, das diese Umwandlung in umgekehrter Richtung vornimmt,
+  also z.\,B.\ bei Eingabe von \lstinline[style=cmd]{44696573206973742065696e20546573742e0a}
+  wieder \lstinline[style=terminal]{Dies ist ein Test.} ausgibt.
+
+  \points{6}
+
+  Hinweis für die Klausur:
+  Abgabe in digitaler Form ist erwünscht, aber nicht zwingend.
+
+  \begin{flushright}
+    \textit{Viel Erfolg!}
+  \end{flushright}
+
+  \makeatletter
+    \immediate\write\@mainaux{\string\gdef\string\totalpoints{\arabic{points}}}
+  \makeatother
+
+\end{document}

20191205/logo-hochschule-bochum-cvh-text-v2.pdf

+../common/logo-hochschule-bochum-cvh-text-v2.pdf
\ No newline at end of file