diff --git a/20201119/chars-1.c b/20201119/chars-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..7089769e0a9e70cfff426c4d0fa15c89b562cec0
--- /dev/null
+++ b/20201119/chars-1.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%d\n", '*');
+  printf ("%c\n", 71);
+  return 0;
+}
diff --git a/20201119/chars-2.c b/20201119/chars-2.c
new file mode 100644
index 0000000000000000000000000000000000000000..326aa6334808f996101cea23435e8aa4d71940c3
--- /dev/null
+++ b/20201119/chars-2.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%d\n", '*');
+  printf ("%x\n", '*');
+  printf ("%c\n", 71);
+  return 0;
+}
diff --git a/20201119/chars-3.c b/20201119/chars-3.c
new file mode 100644
index 0000000000000000000000000000000000000000..515341ce8681ea1596761494b53c431f698a9d5d
--- /dev/null
+++ b/20201119/chars-3.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%d\n", '*');
+  printf ("%x\n", '*');
+  printf ("%c\n", 71);
+  printf ("%c\n", 0x65);
+  return 0;
+}
diff --git a/20201119/strings-1.c b/20201119/strings-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..81bc3cda8affb6268786ac989dd2907d9a84783a
--- /dev/null
+++ b/20201119/strings-1.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%d", *p);
+  return 0;
+}
diff --git a/20201119/strings-10.c b/20201119/strings-10.c
new file mode 100644
index 0000000000000000000000000000000000000000..f01f72c7803ae94d6f35f99f8777b10a0e43f5e0
--- /dev/null
+++ b/20201119/strings-10.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 'H', 'a', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', '\n', 0 };
+  printf ("%s", hello);
+  return 0;
+}
diff --git a/20201119/strings-11.c b/20201119/strings-11.c
new file mode 100644
index 0000000000000000000000000000000000000000..ced6e34e6d60e600655c4152028416be1139c583
--- /dev/null
+++ b/20201119/strings-11.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 'H', 'a', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', '\n' };
+  /* Hier fehlt das Null-Symbol am Ende des Strings!
+     ==> printf() liest über das String-Ende hinaus,
+         bis es im Speicher zufällig auf eine 0 stößt.
+         Dies kann zu einem Absturz führen! */
+  printf ("%s", hello);
+  return 0;
+}
diff --git a/20201119/strings-12.c b/20201119/strings-12.c
new file mode 100644
index 0000000000000000000000000000000000000000..b35da3453417c6087ce1a3b0db0f10d7e5070231
--- /dev/null
+++ b/20201119/strings-12.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char *hello = "Hello, world!";
+  printf ("%s\n", hello);
+  return 0;
+}
diff --git a/20201119/strings-13.c b/20201119/strings-13.c
new file mode 100644
index 0000000000000000000000000000000000000000..0165d83890b6d0bd202dec2eb62bde98f838db3f
--- /dev/null
+++ b/20201119/strings-13.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%s\n", "Hallo, Welt!");
+  return 0;
+}
diff --git a/20201119/strings-14.c b/20201119/strings-14.c
new file mode 100644
index 0000000000000000000000000000000000000000..32e64d466014a6c8244f3297198876f1a4a48d5a
--- /dev/null
+++ b/20201119/strings-14.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%s\n", "Hallo, Welt!" + 4);
+  return 0;
+}
diff --git a/20201119/strings-15.c b/20201119/strings-15.c
new file mode 100644
index 0000000000000000000000000000000000000000..2615531f95f77c4d5f1577eff9f8c8180a3b30ab
--- /dev/null
+++ b/20201119/strings-15.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Die Ersparnis beträgt %d%%.\n", 42);
+  return 0;
+}
diff --git a/20201119/strings-16.c b/20201119/strings-16.c
new file mode 100644
index 0000000000000000000000000000000000000000..43b27266c61a8d05e62a9e5cd5881447d5300ccc
--- /dev/null
+++ b/20201119/strings-16.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Die Ersparnis beträgt %d%c.\n", 42, '%');
+  return 0;
+}
diff --git a/20201119/strings-17.c b/20201119/strings-17.c
new file mode 100644
index 0000000000000000000000000000000000000000..3f8e223099e7183a4ecb743458ae1baaed7fdead
--- /dev/null
+++ b/20201119/strings-17.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Der Format-String lautet: %s\n", "%02hhx");
+  return 0;
+}
diff --git a/20201119/strings-18.c b/20201119/strings-18.c
new file mode 100644
index 0000000000000000000000000000000000000000..ac0ad7c70f69972cde6062738962a3b380ab1d7b
--- /dev/null
+++ b/20201119/strings-18.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Добрый день!\n");
+  return 0;
+}
diff --git a/20201119/strings-19.c b/20201119/strings-19.c
new file mode 100644
index 0000000000000000000000000000000000000000..7f91d53741d7a56e165839108d0c25dc4701ac8f
--- /dev/null
+++ b/20201119/strings-19.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%s\n", "Добрый день!");
+  return 0;
+}
diff --git a/20201119/strings-2.c b/20201119/strings-2.c
new file mode 100644
index 0000000000000000000000000000000000000000..4df32974a15ef2752512cc8b9889381b5a0917cd
--- /dev/null
+++ b/20201119/strings-2.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hello, world!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}
diff --git a/20201119/strings-20.c b/20201119/strings-20.c
new file mode 100644
index 0000000000000000000000000000000000000000..17d6d120cdbee211a3316b0a2ff0f5f0e93fb7b6
--- /dev/null
+++ b/20201119/strings-20.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%d\n", "Д");  /* Falsch: gibt die Speicheradresse des "Д" aus. */
+  return 0;
+}
diff --git a/20201119/strings-21.c b/20201119/strings-21.c
new file mode 100644
index 0000000000000000000000000000000000000000..ba95961c605d7b1375f76ddca48b14442892f465
--- /dev/null
+++ b/20201119/strings-21.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%d\n", 'Д');  /* Der ausgegebene Zahlenwert ist _nicht_ der Unicode für 'Д'. */
+  return 0;
+}
diff --git a/20201119/strings-22.c b/20201119/strings-22.c
new file mode 100644
index 0000000000000000000000000000000000000000..982de510faa8dcbd2bcdf285d007b3ccdb98846b
--- /dev/null
+++ b/20201119/strings-22.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%08x\n", 'Д');  /* Der ausgegebene Zahlenwert ist _nicht_ der Unicode für 'Д'. */
+  return 0;                /* Für korrekte Handhabung von UTF-8: Bibliothek verwenden.    */
+}
diff --git a/20201119/strings-23.c b/20201119/strings-23.c
new file mode 100644
index 0000000000000000000000000000000000000000..4b89550c9e9572581894704b4e541346232bb569
--- /dev/null
+++ b/20201119/strings-23.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("%08x\n", 'ä');  /* Der ausgegebene Zahlenwert ist _nicht_ der Unicode für 'ä', */
+  return 0;                /* sondern die UTF-8-Kodierung für 'ä'.                        */
+                           /* Für korrekte Handhabung von UTF-8: Bibliothek verwenden.    */
+}
diff --git a/20201119/strings-3.c b/20201119/strings-3.c
new file mode 100644
index 0000000000000000000000000000000000000000..5c36db92dac8129b66d1f0ff6b709534b9e1bdb3
--- /dev/null
+++ b/20201119/strings-3.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  for (char *p = hello; *p; p++)
+    printf ("%c", *p);
+  return 0;
+}
diff --git a/20201119/strings-4.c b/20201119/strings-4.c
new file mode 100644
index 0000000000000000000000000000000000000000..aa189d9f4170e47899e9e7854070af0f73573517
--- /dev/null
+++ b/20201119/strings-4.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  for (char *p = hello; !*p; p++)
+    printf ("%c", *p);
+  return 0;
+}
diff --git a/20201119/strings-5.c b/20201119/strings-5.c
new file mode 100644
index 0000000000000000000000000000000000000000..f37edf15be04770135c5b178d204638c18f7f12b
--- /dev/null
+++ b/20201119/strings-5.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hällou, wörldt!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%x ", *p);
+  printf ("\n");
+  return 0;
+}
diff --git a/20201119/strings-6.c b/20201119/strings-6.c
new file mode 100644
index 0000000000000000000000000000000000000000..3ae70e168f0a7101ffecb34e407a919dd7c19cf0
--- /dev/null
+++ b/20201119/strings-6.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hällou, wörldt!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%hhx ", *p);
+  printf ("\n");
+  return 0;
+}
diff --git a/20201119/strings-7.c b/20201119/strings-7.c
new file mode 100644
index 0000000000000000000000000000000000000000..49dfb3e2a213c46448c33ba949af5ab281018677
--- /dev/null
+++ b/20201119/strings-7.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hällou, wörldt!\n";
+  for (char *p = hello; *p; p++)
+    printf ("%02hhx ", *p);
+  printf ("\n");
+  return 0;
+}
diff --git a/20201119/strings-8.c b/20201119/strings-8.c
new file mode 100644
index 0000000000000000000000000000000000000000..2f739c8c80d6923e9f17a184a629a37877f6131c
--- /dev/null
+++ b/20201119/strings-8.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = "Hallo, Welt!\n";
+  printf ("%s", hello);
+  return 0;
+}
diff --git a/20201119/strings-9.c b/20201119/strings-9.c
new file mode 100644
index 0000000000000000000000000000000000000000..74f11c34440c4ed87b886ef9aad8c9a39cb70a33
--- /dev/null
+++ b/20201119/strings-9.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main (void)
+{
+  char hello[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };
+  printf ("%s", hello);
+  return 0;
+}