Beispiele 26.10.2023

20231019/strings-07a.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  printf ("%s\n", hello - 7);
+  printf ("%zd\n", strlen (hello - 7));
+
+  return 0;
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  return 0;
+}

20231019/strings-07b.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  printf ("%s\n", hello - 1);
+  printf ("%zd\n", strlen (hello - 1));
+
+  return 0;
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  return 0;
+}

20231019/strings-07c.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  printf ("%s\n", hello - 1);
+  printf ("%zd\n", strlen (hello - 1));
+
+  return 0;
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  return 0;
+}

20231019/strings-07d.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  printf ("%s\n", hello + 17);
+  printf ("%zd\n", strlen (hello + 17));
+
+  return 0;
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  return 0;
+}

20231026/answer.c

+#include "answer.h"
+
+int answer (void)
+{
+  return 23;
+}

20231026/answer.h

+extern int answer (void);

20231026/gtk-01.c

@@ -9,7 +9,7 @@ static void activate (GtkApplication *app, gpointer user_data)
 
 int main (int argc, char **argv)
 {
-  GtkApplication *app = gtk_application_new ("de.hs-bochum.cvh.hp.hello-gtk", G_APPLICATION_DEFAULT_FLAGS);
+  GtkApplication *app = gtk_application_new ("de.hs-bochum.cvh.hp.gtk-01", G_APPLICATION_DEFAULT_FLAGS);
   g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
   int status = g_application_run (G_APPLICATION (app), argc, argv);
   g_object_unref (app);

20231026/gtk-02.c

 #include <gtk/gtk.h>
+#include <stdio.h>
 
 static void hello (GtkWidget *this, gpointer user_data)
 {
@@ -18,7 +19,7 @@ static void activate (GtkApplication *app, gpointer user_data)
 
 int main (int argc, char **argv)
 {
-  GtkApplication *app = gtk_application_new ("de.hs-bochum.cvh.hp.hello-gtk", G_APPLICATION_DEFAULT_FLAGS);
+  GtkApplication *app = gtk_application_new ("de.hs-bochum.cvh.hp.gtk-02", G_APPLICATION_DEFAULT_FLAGS);
   g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
   int status = g_application_run (G_APPLICATION (app), argc, argv);
   g_object_unref (app);

20231026/hello-01.c

+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}

20231026/hello-02.c

+extern int printf (const char *__restrict __format, ...);
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}

20231026/higher-math-01.c

+#include <stdio.h>
+
+#define NINE 9
+#define SIX 6
+
+int main (void)
+{
+  printf ("nine times six = %d\n", NINE * SIX);
+  return 0;
+}

20231026/higher-math-02.c

+#include <stdio.h>
+
+#define NINE 1 + 8
+#define SIX 5 + 1
+
+int main (void)
+{
+  printf ("nine times six = %d\n", NINE * SIX);
+  return 0;
+}

20231026/higher-math-03.c

+#include <stdio.h>
+
+#define NINE (1 + 8)
+#define SIX (5 + 1)
+
+int main (void)
+{
+  printf ("nine times six = %d\n", NINE * SIX);
+  return 0;
+}

20231026/higher-math-04.c

+#include <stdio.h>
+
+#define NINE (1 + 8)
+#define SIX (5 + 1));
+
+int main (void)
+{
+  printf ("nine times six = %d\n", NINE * SIX
+  return 0;
+}

20231026/higher-math-05.c

+#include <stdio.h>
+
+#define NINE (1 + 8
+#define SIX (5 + 1));
+
+int main (void)
+{
+  printf ("nine times six = %d\n", NINE) * SIX
+  return 0;
+}

20231026/hp-20231026.tex

@@ -514,7 +514,7 @@
 
     int main (void)
     {
-      date today = { 17, 10, 2022 };
+      date today = { 26, 10, 2023 };
       printf ("%d.%d.%d\n", today.day, today.month, today.year);
       return 0;
     }
@@ -538,9 +538,9 @@
 
       void set_date (date *d)
       {
-        (*d).day = 17;
+        (*d).day = 26;
         (*d).month = 10;
-        (*d).year = 2022;
+        (*d).year = 2023;
       }¿
     \end{lstlisting}
   \end{minipage}%
@@ -575,9 +575,9 @@
 
       void set_date (date *d)
       {
-        d->day = 17;
+        d->day = 26;
         d->month = 10;
-        d->year = 2022;
+        d->year = 2023;
       }¿
     \end{lstlisting}
   \end{minipage}%
@@ -1050,7 +1050,7 @@
     \pause
     \smallskip
     \item
-      Mit \lstinline[style=cmd]{pkg-config --cflags --libs} erfährt man,\\
+      Mit \lstinline[style=cmd]{pkg-config --cflags --libs gtk4} erfährt man,\\
       welche Optionen und Bibliotheken man an \lstinline[style=cmd]{gcc}
       übergeben muß\alt<4->{.}{:}
       \pause

20231026/philosophy.c

+#include <stdio.h>
+#include "answer.h"
+
+int main (void)
+{
+  printf ("The answer is %d.\n", answer ());
+  return 0;
+}

20231026/string-ops-01.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char *anton = "Anton";
+  char *zacharias = "Zacharias";
+
+  printf ("%d\n", strcmp (anton, zacharias));
+  printf ("%d\n", strcmp (zacharias, anton));
+  printf ("%d\n", strcmp (anton, anton));
+
+  return 0;
+
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+
+  return 0;
+}

20231026/string-ops-02.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char *anton = "Anton";
+  char *zacharias = "Zacharias";
+
+  printf ("%d\n", anton < zacharias);
+  printf ("%d\n", zacharias < anton);
+  printf ("%d\n", anton == anton);
+
+  return 0;
+
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+
+  return 0;
+}