Vorbereitung 14.11.2019

20191107/blink-0a.c

+#include <avr/io.h>
+
+int main (void)
+{
+  DDRD = 0x40;   /* binär: 0100 0000 */
+  PORTD = 0x00;  /* binär: 0000 0000 */
+  while (1);
+  return 0;
+}

20191107/main-params-1.c

+#include <stdio.h>
+
+int main (int argc, char **argv)
+{
+  printf ("argc = %d\n", argc);
+  for (int i = 0; i < argc; i++)
+    printf ("argv[%d] = \"%s\"\n", i, argv[i]);
+  return 0;
+}

20191107/main-params-2.c

+#include <stdio.h>
+
+int main (int argc, char **argv)
+{
+  printf ("argc = %d\n", argc);
+  for (int i = 0; *argv; i++, argv++)
+    printf ("argv[%d] = \"%s\"\n", i, *argv);
+  return 0;
+}

20191107/main-params-3.c

+#include <stdio.h>
+
+int main (int argc, char **argv)
+{
+  printf ("argc = %d\n", argc);
+  int i = 0;
+  while (*argv)
+    printf ("argv[%d] = \"%s\"\n", i++, *argv++);
+  return 0;
+}

20191107/string-ops-1.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));
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+*/
+
+  return 0;
+}

20191107/string-ops-10.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char *anton1 = "Anton";
+  char *anton2 = "anton";
+  char *zacharias1 = "Zacharias";
+  char *zacharias2 = "zacharias";
+
+  printf ("%d\n", strcmp (anton2, zacharias1));
+  printf ("%d\n", strcmp (anton2, zacharias2));
+
+  return 0;
+}

20191107/string-ops-11.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));
+
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+
+  return 0;
+}

20191107/string-ops-12.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));
+
+  char buffer[] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+
+  return 0;
+}

20191107/string-ops-13.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));
+
+  char buffer[] = "Huber ";
+  strcat (buffer, anton);
+  strcat (buffer, anton);
+  strcat (buffer, anton);
+  strcat (buffer, anton);
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+
+  return 0;
+}

20191107/string-ops-14.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));
+
+  char buffer[20] = "Huber ";
+  strncat (buffer, anton, 20);
+  strncat (buffer, anton, 20);
+  strncat (buffer, anton, 20);
+  strncat (buffer, anton, 20);
+  strncat (buffer, anton, 20);
+  printf ("%s\n", buffer);
+
+  return 0;
+}

20191107/string-ops-15.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char buffer[100] = "";
+  sprintf (buffer, "Die Antwort lautet: %d", 42);
+  printf ("%s\n", buffer);
+
+/*
+  char *answer = strstr (buffer, "Antwort");
+  printf ("%s\n", answer);
+  printf ("found at: %zd\n", answer - buffer);
+*/
+
+  return 0;
+}

20191107/string-ops-16.c

+#include <stdio.h>
+#include <string.h>
+
+int main (void)
+{
+  char buffer[100] = "";
+  snprintf (buffer, 100, "Die Antwort lautet: %d", 42);
+  printf ("%s\n", buffer);
+
+/*
+  char *answer = strstr (buffer, "Antwort");
+  printf ("%s\n", answer);
+  printf ("found at: %zd\n", answer - buffer);
+*/
+
+  return 0;
+}

20191107/string-ops-2.c

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

20191107/string-ops-3.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));
+
+/*
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+*/
+
+  return 0;
+}

20191107/string-ops-4.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));
+
+  hello[5] = 0;
+  printf ("%s\n", hello);
+  printf ("%zd\n", strlen (hello));
+
+  return 0;
+}

20191107/string-ops-5.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));
+
+/*
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+*/
+
+  return 0;
+}

20191107/string-ops-6.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));
+
+  if (anton == anton)
+    printf ("gleich\n");
+  else
+    printf ("ungleich\n");
+/*
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+*/
+
+  return 0;
+}

20191107/string-ops-7.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));
+
+  char anton2[] = "Anton";
+  if (anton == anton2)
+    printf ("gleich\n");
+  else
+    printf ("ungleich\n");
+/*
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+*/
+
+  return 0;
+}

20191107/string-ops-8.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));
+
+  char *anton2 = "Anton";
+  if (anton == anton2)
+    printf ("gleich\n");
+  else
+    printf ("ungleich\n");
+/*
+  char buffer[100] = "Huber ";
+  strcat (buffer, anton);
+  printf ("%s\n", buffer);
+*/
+
+  return 0;
+}