From f8790753f7d087fe3d84be9d0725cc6d75eb5da1 Mon Sep 17 00:00:00 2001
From: Peter Gerwinski <peter.gerwinski@hs-bochum.de>
Date: Thu, 12 Oct 2023 18:02:59 +0200
Subject: [PATCH] Beispiele 12.10.2023

---
 20231012/arrays-01.c       | 10 ++++++++++
 20231012/arrays-02.c       | 10 ++++++++++
 20231012/arrays-03.c       |  9 +++++++++
 20231012/arrays-04.c       |  9 +++++++++
 20231012/arrays-05.c       |  9 +++++++++
 20231012/arrays-06.c       |  9 +++++++++
 20231012/functions-01.c    |  4 ++++
 20231012/functions-02.c    |  4 ++++
 20231012/functions-03.c    | 12 ++++++++++++
 20231012/functions-04.c    | 12 ++++++++++++
 20231012/functions-05.c    | 12 ++++++++++++
 20231012/functions-06.c    | 26 ++++++++++++++++++++++++++
 20231012/functions-07.c    | 27 +++++++++++++++++++++++++++
 20231012/functions-08.c    | 27 +++++++++++++++++++++++++++
 20231012/functions-09.c    | 27 +++++++++++++++++++++++++++
 20231012/functions-10.c    | 27 +++++++++++++++++++++++++++
 20231012/functions-11.c    | 28 ++++++++++++++++++++++++++++
 20231012/functions-12.c    | 26 ++++++++++++++++++++++++++
 20231012/goto-01.c         | 13 +++++++++++++
 20231012/goto-02.c         | 15 +++++++++++++++
 20231012/loops-01.c        | 16 ++++++++++++++++
 20231012/loops-02.c        | 16 ++++++++++++++++
 20231012/loops-03.c        | 16 ++++++++++++++++
 20231012/pointers-01.c     | 14 ++++++++++++++
 20231012/printf-01.c       | 11 +++++++++++
 20231012/printf-02.c       | 11 +++++++++++
 20231012/printf-03.c       | 11 +++++++++++
 20231012/printf-04.c       | 11 +++++++++++
 20231012/side-effects-01.c |  8 ++++++++
 20231012/side-effects-02.c |  8 ++++++++
 20231012/side-effects-03.c |  9 +++++++++
 20231012/side-effects-04.c | 11 +++++++++++
 20231012/side-effects-05.c | 11 +++++++++++
 20231012/side-effects-06.c |  8 ++++++++
 20231012/side-effects-07.c |  8 ++++++++
 20231012/side-effects-08.c |  8 ++++++++
 20231012/side-effects-09.c |  8 ++++++++
 20231012/side-effects-10.c |  9 +++++++++
 20231012/side-effects-11.c |  9 +++++++++
 20231012/side-effects-12.c |  9 +++++++++
 20231012/side-effects-13.c | 13 +++++++++++++
 20231012/side-effects-14.c | 15 +++++++++++++++
 20231012/side-effects-15.c | 13 +++++++++++++
 43 files changed, 569 insertions(+)
 create mode 100644 20231012/arrays-01.c
 create mode 100644 20231012/arrays-02.c
 create mode 100644 20231012/arrays-03.c
 create mode 100644 20231012/arrays-04.c
 create mode 100644 20231012/arrays-05.c
 create mode 100644 20231012/arrays-06.c
 create mode 100644 20231012/functions-01.c
 create mode 100644 20231012/functions-02.c
 create mode 100644 20231012/functions-03.c
 create mode 100644 20231012/functions-04.c
 create mode 100644 20231012/functions-05.c
 create mode 100644 20231012/functions-06.c
 create mode 100644 20231012/functions-07.c
 create mode 100644 20231012/functions-08.c
 create mode 100644 20231012/functions-09.c
 create mode 100644 20231012/functions-10.c
 create mode 100644 20231012/functions-11.c
 create mode 100644 20231012/functions-12.c
 create mode 100644 20231012/goto-01.c
 create mode 100644 20231012/goto-02.c
 create mode 100644 20231012/loops-01.c
 create mode 100644 20231012/loops-02.c
 create mode 100644 20231012/loops-03.c
 create mode 100644 20231012/pointers-01.c
 create mode 100644 20231012/printf-01.c
 create mode 100644 20231012/printf-02.c
 create mode 100644 20231012/printf-03.c
 create mode 100644 20231012/printf-04.c
 create mode 100644 20231012/side-effects-01.c
 create mode 100644 20231012/side-effects-02.c
 create mode 100644 20231012/side-effects-03.c
 create mode 100644 20231012/side-effects-04.c
 create mode 100644 20231012/side-effects-05.c
 create mode 100644 20231012/side-effects-06.c
 create mode 100644 20231012/side-effects-07.c
 create mode 100644 20231012/side-effects-08.c
 create mode 100644 20231012/side-effects-09.c
 create mode 100644 20231012/side-effects-10.c
 create mode 100644 20231012/side-effects-11.c
 create mode 100644 20231012/side-effects-12.c
 create mode 100644 20231012/side-effects-13.c
 create mode 100644 20231012/side-effects-14.c
 create mode 100644 20231012/side-effects-15.c

diff --git a/20231012/arrays-01.c b/20231012/arrays-01.c
new file mode 100644
index 0000000..35cf856
--- /dev/null
+++ b/20231012/arrays-01.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[5] = { 2, 3, 5, 7, 11 };
+  int *p = prime;
+  for (int i = 0; i < 5; i++)
+    printf ("%d\n", *(p + i));
+  return 0;
+}
diff --git a/20231012/arrays-02.c b/20231012/arrays-02.c
new file mode 100644
index 0000000..d206e6c
--- /dev/null
+++ b/20231012/arrays-02.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[5] = { 2, 3, 5, 7, 11 };
+  int *p = prime;
+  for (int i = 0; i < 5; i++)
+    printf ("%d\n", p[i]);
+  return 0;
+}
diff --git a/20231012/arrays-03.c b/20231012/arrays-03.c
new file mode 100644
index 0000000..83a03a4
--- /dev/null
+++ b/20231012/arrays-03.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[5] = { 2, 3, 5, 7, 11 };
+  for (int i = 0; i < 5; i++)
+    printf ("%d\n", prime[i]);
+  return 0;
+}
diff --git a/20231012/arrays-04.c b/20231012/arrays-04.c
new file mode 100644
index 0000000..2015ffc
--- /dev/null
+++ b/20231012/arrays-04.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[5] = { 2, 3, 5, 7, 11 };
+  for (int *p = prime; p < prime + 5; p++)
+    printf ("%d\n", *p);
+  return 0;
+}
diff --git a/20231012/arrays-05.c b/20231012/arrays-05.c
new file mode 100644
index 0000000..dcf3217
--- /dev/null
+++ b/20231012/arrays-05.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[6] = { 2, 3, 5, 7, 11, 0 };
+  for (int *p = prime; *p; p++)
+    printf ("%d\n", *p);
+  return 0;
+}
diff --git a/20231012/arrays-06.c b/20231012/arrays-06.c
new file mode 100644
index 0000000..6e19ec4
--- /dev/null
+++ b/20231012/arrays-06.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int prime[] = { 2, 3, 5, 7, 11, 0 };
+  for (int *p = prime; *p; p++)
+    printf ("%d\n", *p);
+  return 0;
+}
diff --git a/20231012/functions-01.c b/20231012/functions-01.c
new file mode 100644
index 0000000..2f3e95f
--- /dev/null
+++ b/20231012/functions-01.c
@@ -0,0 +1,4 @@
+int main (void)
+{
+  return 0;
+}
diff --git a/20231012/functions-02.c b/20231012/functions-02.c
new file mode 100644
index 0000000..5fdf5e7
--- /dev/null
+++ b/20231012/functions-02.c
@@ -0,0 +1,4 @@
+int main (void)
+{
+  return 42;
+}
diff --git a/20231012/functions-03.c b/20231012/functions-03.c
new file mode 100644
index 0000000..e1adaf7
--- /dev/null
+++ b/20231012/functions-03.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+void hello ()
+{
+  printf ("Hello, world!\n");
+}
+
+int main ()
+{
+  hello ();
+  return 0;
+}
diff --git a/20231012/functions-04.c b/20231012/functions-04.c
new file mode 100644
index 0000000..b22a109
--- /dev/null
+++ b/20231012/functions-04.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+void hello ()
+{
+  printf ("Hello, world!\n");
+}
+
+int main ()
+{
+  hello (42);
+  return 0;
+}
diff --git a/20231012/functions-05.c b/20231012/functions-05.c
new file mode 100644
index 0000000..055972f
--- /dev/null
+++ b/20231012/functions-05.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+void hello (void)
+{
+  printf ("Hello, world!\n");
+}
+
+int main (void)
+{
+  hello (42);
+  return 0;
+}
diff --git a/20231012/functions-06.c b/20231012/functions-06.c
new file mode 100644
index 0000000..23afba7
--- /dev/null
+++ b/20231012/functions-06.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+int a, b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-07.c b/20231012/functions-07.c
new file mode 100644
index 0000000..744ebc9
--- /dev/null
+++ b/20231012/functions-07.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int a;  /* bekommt den Wert 0, weil global */
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;  /* bekäme ohne Initialisierung einen Phantasie-Wert */
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  return 0;
+
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-08.c b/20231012/functions-08.c
new file mode 100644
index 0000000..dba5528
--- /dev/null
+++ b/20231012/functions-08.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int a = 0;
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-09.c b/20231012/functions-09.c
new file mode 100644
index 0000000..15b1c39
--- /dev/null
+++ b/20231012/functions-09.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int a = 0;
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-10.c b/20231012/functions-10.c
new file mode 100644
index 0000000..33ac1b3
--- /dev/null
+++ b/20231012/functions-10.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int a = 0;
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  return 0;
+
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-11.c b/20231012/functions-11.c
new file mode 100644
index 0000000..9f70514
--- /dev/null
+++ b/20231012/functions-11.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+int a = 0;
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+  b++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  return 0;
+
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/functions-12.c b/20231012/functions-12.c
new file mode 100644
index 0000000..0a8c713
--- /dev/null
+++ b/20231012/functions-12.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+int a = 0;
+int b = 3;
+
+void foo (void)
+{
+  b++;
+  static int a = 5;
+  int b = 7;
+  printf ("foo(): a = %d, b = %d\n", a, b);
+  a++;
+  b++;
+}
+
+int main (void)
+{
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  a = b = 12;
+  printf ("main(): a = %d, b = %d\n", a, b);
+  foo ();
+  printf ("main(): a = %d, b = %d\n", a, b);
+  return 0;
+}
diff --git a/20231012/goto-01.c b/20231012/goto-01.c
new file mode 100644
index 0000000..daa96a7
--- /dev/null
+++ b/20231012/goto-01.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int i = 0;
+loop:
+  if (i >= 10)
+    goto endloop;
+  printf ("%d\n", i++);
+  goto loop;
+endloop:
+  return 0;
+}
diff --git a/20231012/goto-02.c b/20231012/goto-02.c
new file mode 100644
index 0000000..63b069b
--- /dev/null
+++ b/20231012/goto-02.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int i = 0;
+loop:
+  if (i >= 10)
+    goto endloop;
+  printf ("%d\n", i++);
+  goto loop;
+  int a = 42;
+endloop:
+  printf ("The answer is: %d\n", a);
+  return 0;
+}
diff --git a/20231012/loops-01.c b/20231012/loops-01.c
new file mode 100644
index 0000000..909a834
--- /dev/null
+++ b/20231012/loops-01.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 1;
+  do
+   {
+     if (a <= 10)
+       {
+         printf ("%d\n", a);
+         a++;
+       }
+   }
+  while (a <= 10);
+  return 0;
+}
diff --git a/20231012/loops-02.c b/20231012/loops-02.c
new file mode 100644
index 0000000..4abdb5c
--- /dev/null
+++ b/20231012/loops-02.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 11;
+  do
+   {
+     if (a <= 10)
+       {
+         printf ("%d\n", a);
+         a++;
+       }
+   }
+  while (a <= 10);
+  return 0;
+}
diff --git a/20231012/loops-03.c b/20231012/loops-03.c
new file mode 100644
index 0000000..2b6c8b5
--- /dev/null
+++ b/20231012/loops-03.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 11;
+  if (a <= 10)
+    {
+      do
+        {
+          printf ("%d\n", a);
+          a++;
+        }
+      while (a <= 10);
+    }
+  return 0;
+}
diff --git a/20231012/pointers-01.c b/20231012/pointers-01.c
new file mode 100644
index 0000000..3bd2e86
--- /dev/null
+++ b/20231012/pointers-01.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void calc_answer (int *a)
+{
+  *a = 42;
+}
+
+int main (void)
+{
+  int answer;
+  calc_answer (&answer);
+  printf ("The answer is %d.\n", answer);
+  return 0;
+}
diff --git a/20231012/printf-01.c b/20231012/printf-01.c
new file mode 100644
index 0000000..02fb608
--- /dev/null
+++ b/20231012/printf-01.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main (void)
+{
+  int answer = 42;
+  printf ("Die Antwort lautet: ");
+  printf (answer);
+  printf ("\n");
+  return 0;
+}
diff --git a/20231012/printf-02.c b/20231012/printf-02.c
new file mode 100644
index 0000000..6ad99bc
--- /dev/null
+++ b/20231012/printf-02.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main (void)
+{
+  uint64_t answer = 42;
+  printf ("Die Antwort lautet: ");
+  printf (answer);
+  printf ("\n");
+  return 0;
+}
diff --git a/20231012/printf-03.c b/20231012/printf-03.c
new file mode 100644
index 0000000..7f08428
--- /dev/null
+++ b/20231012/printf-03.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main (void)
+{
+  uint64_t answer = "zweiundvierzig";
+  printf ("Die Antwort lautet: ");
+  printf (answer);
+  printf ("\n");
+  return 0;
+}
diff --git a/20231012/printf-04.c b/20231012/printf-04.c
new file mode 100644
index 0000000..d1221fd
--- /dev/null
+++ b/20231012/printf-04.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main (void)
+{
+  uint64_t answer = &answer;
+  printf ("Die Antwort lautet: ");
+  printf (answer);
+  printf ("\n");
+  return 0;
+}
diff --git a/20231012/side-effects-01.c b/20231012/side-effects-01.c
new file mode 100644
index 0000000..61c4abb
--- /dev/null
+++ b/20231012/side-effects-01.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  "Hello, world!\n";
+  return 0;
+}
diff --git a/20231012/side-effects-02.c b/20231012/side-effects-02.c
new file mode 100644
index 0000000..c7221c5
--- /dev/null
+++ b/20231012/side-effects-02.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = printf ("Hello, world!\n");
+  printf ("%d\n", a);
+  return 0;
+}
diff --git a/20231012/side-effects-03.c b/20231012/side-effects-03.c
new file mode 100644
index 0000000..61ef5b6
--- /dev/null
+++ b/20231012/side-effects-03.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  int b = 5;
+  printf ("%d\n", a += b);
+  return 0;
+}
diff --git a/20231012/side-effects-04.c b/20231012/side-effects-04.c
new file mode 100644
index 0000000..6e58cf7
--- /dev/null
+++ b/20231012/side-effects-04.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  int b = 5;
+  printf ("%d\n", a += b);
+  printf ("%d\n", a);
+  printf ("%d\n", b);
+  return 0;
+}
diff --git a/20231012/side-effects-05.c b/20231012/side-effects-05.c
new file mode 100644
index 0000000..0b1e8bf
--- /dev/null
+++ b/20231012/side-effects-05.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  int b = 5;
+  printf ("%d\n", a + b);
+  printf ("%d\n", a);
+  printf ("%d\n", b);
+  return 0;
+}
diff --git a/20231012/side-effects-06.c b/20231012/side-effects-06.c
new file mode 100644
index 0000000..5602fdb
--- /dev/null
+++ b/20231012/side-effects-06.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  printf ("%d\n", a = 7);
+  return 0;
+}
diff --git a/20231012/side-effects-07.c b/20231012/side-effects-07.c
new file mode 100644
index 0000000..522f945
--- /dev/null
+++ b/20231012/side-effects-07.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  printf ("%d\n", a + 7);
+  return 0;
+}
diff --git a/20231012/side-effects-08.c b/20231012/side-effects-08.c
new file mode 100644
index 0000000..bff3ab6
--- /dev/null
+++ b/20231012/side-effects-08.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  printf ("%d\n", a == 7);
+  return 0;
+}
diff --git a/20231012/side-effects-09.c b/20231012/side-effects-09.c
new file mode 100644
index 0000000..26dbc41
--- /dev/null
+++ b/20231012/side-effects-09.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  printf ("%d\n", a == 3);
+  return 0;
+}
diff --git a/20231012/side-effects-10.c b/20231012/side-effects-10.c
new file mode 100644
index 0000000..f9f4ffe
--- /dev/null
+++ b/20231012/side-effects-10.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  a = 3,14;
+  printf ("%d\n", a);
+  return 0;
+}
diff --git a/20231012/side-effects-11.c b/20231012/side-effects-11.c
new file mode 100644
index 0000000..05b37ad
--- /dev/null
+++ b/20231012/side-effects-11.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  a = (3,14);
+  printf ("%d\n", a);
+  return 0;
+}
diff --git a/20231012/side-effects-12.c b/20231012/side-effects-12.c
new file mode 100644
index 0000000..0953870
--- /dev/null
+++ b/20231012/side-effects-12.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 3;
+  a = 3.14;
+  printf ("%d\n", a);
+  return 0;
+}
diff --git a/20231012/side-effects-13.c b/20231012/side-effects-13.c
new file mode 100644
index 0000000..4a0522d
--- /dev/null
+++ b/20231012/side-effects-13.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 137;
+  int b = 0;
+  if (b == 0)
+    printf ("Bitte nicht durch 0 teilen.\n");
+    printf ("So was macht man nicht.\n");
+  else
+    printf ("a / b = %d\n", a / b);
+  return 0;
+}
diff --git a/20231012/side-effects-14.c b/20231012/side-effects-14.c
new file mode 100644
index 0000000..63357b4
--- /dev/null
+++ b/20231012/side-effects-14.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 137;
+  int b = 0;
+  if (b == 0)
+    {
+      printf ("Bitte nicht durch 0 teilen.\n");
+      printf ("So was macht man nicht.\n");
+    }
+  else
+    printf ("a / b = %d\n", a / b);
+  return 0;
+}
diff --git a/20231012/side-effects-15.c b/20231012/side-effects-15.c
new file mode 100644
index 0000000..d35d2fb
--- /dev/null
+++ b/20231012/side-effects-15.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main (void)
+{
+  int a = 137;
+  int b = 0;
+  if (b == 0)
+    printf ("Bitte nicht durch 0 teilen.\n"),
+    printf ("So was macht man nicht.\n");
+  else
+    printf ("a / b = %d\n", a / b);
+  return 0;
+}
-- 
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