From 889ab95434fbbf61793b509fe7d93eb6c3ae9e6f Mon Sep 17 00:00:00 2001
From: Peter Gerwinski <peter.gerwinski@hs-bochum.de>
Date: Thu, 28 Jan 2021 19:17:47 +0100
Subject: [PATCH] Weitere Beispiele 28.1.2021
---
20210128/hp-20210128.pdf | Bin 170721 -> 170732 bytes
20210128/hp-20210128.tex | 2 +-
20210128/objects-1.c | 28 ++++++++++++++++
20210128/objects-2.c | 28 ++++++++++++++++
20210128/objects-3.c | 34 ++++++++++++++++++++
20210128/objects-3a.c | 34 ++++++++++++++++++++
20210128/objects-4.c | 34 ++++++++++++++++++++
20210128/objects-5.c | 34 ++++++++++++++++++++
20210128/objects-5a.c | 35 ++++++++++++++++++++
20210128/objects-6.c | 39 ++++++++++++++++++++++
20210128/objects-7.c | 43 +++++++++++++++++++++++++
20210128/objects-8.c | 59 +++++++++++++++++++++++++++++++++
20210128/objects-8a.c | 61 +++++++++++++++++++++++++++++++++++
20210128/objects-8b.c | 59 +++++++++++++++++++++++++++++++++
20210128/objects-9.c | 66 +++++++++++++++++++++++++++++++++++++
20210128/objects-9a.c | 68 +++++++++++++++++++++++++++++++++++++++
20210128/unions-1.c | 16 +++++++++
20210128/unions-2.c | 15 +++++++++
20210128/unions-3.c | 15 +++++++++
20210128/unions-4.c | 15 +++++++++
20 files changed, 684 insertions(+), 1 deletion(-)
create mode 100644 20210128/objects-1.c
create mode 100644 20210128/objects-2.c
create mode 100644 20210128/objects-3.c
create mode 100644 20210128/objects-3a.c
create mode 100644 20210128/objects-4.c
create mode 100644 20210128/objects-5.c
create mode 100644 20210128/objects-5a.c
create mode 100644 20210128/objects-6.c
create mode 100644 20210128/objects-7.c
create mode 100644 20210128/objects-8.c
create mode 100644 20210128/objects-8a.c
create mode 100644 20210128/objects-8b.c
create mode 100644 20210128/objects-9.c
create mode 100644 20210128/objects-9a.c
create mode 100644 20210128/unions-1.c
create mode 100644 20210128/unions-2.c
create mode 100644 20210128/unions-3.c
create mode 100644 20210128/unions-4.c
diff --git a/20210128/hp-20210128.pdf b/20210128/hp-20210128.pdf
index fb8d32701478cbfa971c264403c555d07f5d54f9..2f7012a249447a82c6d97afb9afd8378019fdefa 100644
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diff --git a/20210128/hp-20210128.tex b/20210128/hp-20210128.tex
index 87af238..f291a00 100644
--- a/20210128/hp-20210128.tex
+++ b/20210128/hp-20210128.tex
@@ -909,7 +909,7 @@
\item
Zeiger auf verschiedene Strukturen\\
mit einem gemeinsamen Anteil von Datenfeldern\\
- \textarrow\ "`verwandte"' \newterm{Objekte}, \newterm{Klassen} von Objekten
+ \textarrow\ "`verwandte"' \newterm{Objekte}, \newterm{Klassenhierarchie} von Objekten
\item
Struktur, die \emph{nur\/} den gemeinsamen Anteil enthält\\
\textarrow\ "`Vorfahr"', \newterm{Basisklasse}, \newterm{Vererbung}
diff --git a/20210128/objects-1.c b/20210128/objects-1.c
new file mode 100644
index 0000000..1a62866
--- /dev/null
+++ b/20210128/objects-1.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { &i, &s };
+
+ return 0;
+}
diff --git a/20210128/objects-2.c b/20210128/objects-2.c
new file mode 100644
index 0000000..a47cfb4
--- /dev/null
+++ b/20210128/objects-2.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ return 0;
+}
diff --git a/20210128/objects-3.c b/20210128/objects-3.c
new file mode 100644
index 0000000..ff9224c
--- /dev/null
+++ b/20210128/objects-3.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ for (int i = 0; i < 2; i++)
+ if (object[i]->type == 1)
+ printf ("Integer: %d\n", object[i]->content);
+ else if (object[i]->type == 2)
+ printf ("String: \"%s\"\n", object[i]->content);
+
+ return 0;
+}
diff --git a/20210128/objects-3a.c b/20210128/objects-3a.c
new file mode 100644
index 0000000..a285a87
--- /dev/null
+++ b/20210128/objects-3a.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { &i, &s };
+
+ for (int i = 0; i < 2; i++)
+ if (object[i]->type == 1)
+ printf ("Integer: %d\n", object[i]->content);
+ else if (object[i]->type == 2)
+ printf ("String: \"%s\"\n", object[i]->content);
+
+ return 0;
+}
diff --git a/20210128/objects-4.c b/20210128/objects-4.c
new file mode 100644
index 0000000..ef7bffe
--- /dev/null
+++ b/20210128/objects-4.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ for (int i = 0; i < 2; i++)
+ if (object[i]->type == 1)
+ printf ("Integer: %d\n", (t_integer *) object[i]->content);
+ else if (object[i]->type == 2)
+ printf ("String: \"%s\"\n", (t_string *) object[i]->content);
+
+ return 0;
+}
diff --git a/20210128/objects-5.c b/20210128/objects-5.c
new file mode 100644
index 0000000..820181d
--- /dev/null
+++ b/20210128/objects-5.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ for (int i = 0; i < 2; i++)
+ if (object[i]->type == 1)
+ printf ("Integer: %d\n", ((t_integer *) object[i])->content);
+ else if (object[i]->type == 2)
+ printf ("String: \"%s\"\n", ((t_string *) object[i])->content);
+
+ return 0;
+}
diff --git a/20210128/objects-5a.c b/20210128/objects-5a.c
new file mode 100644
index 0000000..14f1cad
--- /dev/null
+++ b/20210128/objects-5a.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int nutzlos;
+ int type;
+} t_base;
+
+typedef struct
+{
+ int content;
+ int type;
+} t_integer;
+
+typedef struct
+{
+ char *content;
+ int type;
+} t_string;
+
+int main (void)
+{
+ t_integer i = { 42, 1 };
+ t_string s = { "Hello, world!", 2 };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ for (int i = 0; i < 2; i++)
+ if (object[i]->type == 1)
+ printf ("Integer: %d\n", ((t_integer *) object[i])->content);
+ else if (object[i]->type == 2)
+ printf ("String: \"%s\"\n", ((t_string *) object[i])->content);
+
+ return 0;
+}
diff --git a/20210128/objects-6.c b/20210128/objects-6.c
new file mode 100644
index 0000000..86847c9
--- /dev/null
+++ b/20210128/objects-6.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+void print_object (t_base *this)
+{
+ if (this->type == 1)
+ printf ("Integer: %d\n", ((t_integer *) this)->content);
+ else if (this->type == 2)
+ printf ("String: \"%s\"\n", ((t_string *) this)->content);
+}
+
+int main (void)
+{
+ t_integer i = { 1, 42 };
+ t_string s = { 2, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s };
+
+ for (int i = 0; i < 2; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-7.c b/20210128/objects-7.c
new file mode 100644
index 0000000..b9b24ad
--- /dev/null
+++ b/20210128/objects-7.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+void print_object (t_base *this)
+{
+ if (this->type == T_INTEGER)
+ printf ("Integer: %d\n", ((t_integer *) this)->content);
+ else if (this->type == T_STRING)
+ printf ("String: \"%s\"\n", ((t_string *) this)->content);
+}
+
+int main (void)
+{
+ t_integer i = { T_INTEGER, 42 };
+ t_string s = { T_STRING, "Hello, world!" };
+
+ t_base *object[] = { (t_base *) &i, (t_base *) &s, NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-8.c b/20210128/objects-8.c
new file mode 100644
index 0000000..0c93e8f
--- /dev/null
+++ b/20210128/objects-8.c
@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+void print_object (t_base *this)
+{
+ if (this->type == T_INTEGER)
+ printf ("Integer: %d\n", ((t_integer *) this)->content);
+ else if (this->type == T_STRING)
+ printf ("String: \"%s\"\n", ((t_string *) this)->content);
+}
+
+t_integer *new_integer (int i)
+{
+ t_integer *p = malloc (sizeof (t_integer));
+ p->type = T_INTEGER;
+ p->content = i;
+ return p;
+}
+
+t_string *new_string (char *s)
+{
+ t_string *p = malloc (sizeof (t_string));
+ p->type = T_STRING;
+ p->content = s;
+ return p;
+}
+
+int main (void)
+{
+ t_base *object[] = { (t_base *) new_integer (42),
+ (t_base *) new_string ("Hello, world!"),
+ NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-8a.c b/20210128/objects-8a.c
new file mode 100644
index 0000000..76c3cc5
--- /dev/null
+++ b/20210128/objects-8a.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+char *content = "Ätsch.";
+
+void print_object (t_base *this)
+{
+ if (this->type == T_INTEGER)
+ printf ("Integer: %d\n", ((t_integer *) this)->content);
+ else if (this->type == T_STRING)
+ printf ("String: \"%s\"\n", ((t_string *) this)->content);
+}
+
+t_integer *new_integer (int i)
+{
+ t_integer *p = malloc (sizeof (t_integer));
+ p->type = T_INTEGER;
+ p->content = i;
+ return p;
+}
+
+t_string *new_string (char *s)
+{
+ t_string *p = malloc (sizeof (t_string));
+ p->type = T_STRING;
+ p->content = s;
+ return p;
+}
+
+int main (void)
+{
+ t_base *object[] = { (t_base *) new_integer (42),
+ (t_base *) new_string ("Hello, world!"),
+ NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-8b.c b/20210128/objects-8b.c
new file mode 100644
index 0000000..a9d7b5a
--- /dev/null
+++ b/20210128/objects-8b.c
@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+void print_object (t_base *this)
+{
+ if (this->type == T_INTEGER)
+ printf ("Integer: %d\n", ((t_integer *) this)->content);
+ else if (this->type == T_STRING)
+ printf ("String: \"%s\"\n", ((t_string *) this)->content);
+}
+
+t_base *new_integer (int i)
+{
+ t_integer *p = malloc (sizeof (t_integer));
+ p->type = T_INTEGER;
+ p->content = i;
+ return (t_base *) p;
+}
+
+t_base *new_string (char *s)
+{
+ t_string *p = malloc (sizeof (t_string));
+ p->type = T_STRING;
+ p->content = s;
+ return (t_base *) p;
+}
+
+int main (void)
+{
+ t_base *object[] = { new_integer (42),
+ new_string ("Hello, world!"),
+ NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-9.c b/20210128/objects-9.c
new file mode 100644
index 0000000..41468b0
--- /dev/null
+++ b/20210128/objects-9.c
@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+typedef union
+{
+ t_base base;
+ t_integer integer;
+ t_string string;
+} t_object;
+
+void print_object (t_object *this)
+{
+ if (this->base.type == T_INTEGER)
+ printf ("Integer: %d\n", this->integer.content);
+ else if (this->base.type == T_STRING)
+ printf ("String: \"%s\"\n", this->string.content);
+}
+
+t_object *new_integer (int i)
+{
+ t_object *p = malloc (sizeof (t_integer));
+ p->integer.type = T_INTEGER;
+ p->integer.content = i;
+ return p;
+}
+
+t_object *new_string (char *s)
+{
+ t_object *p = malloc (sizeof (t_string));
+ p->string.type = T_STRING;
+ p->string.content = s;
+ return p;
+}
+
+int main (void)
+{
+ t_object *object[] = { new_integer (42),
+ new_string ("Hello, world!"),
+ NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ return 0;
+}
diff --git a/20210128/objects-9a.c b/20210128/objects-9a.c
new file mode 100644
index 0000000..46431c9
--- /dev/null
+++ b/20210128/objects-9a.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define T_BASE 0
+#define T_INTEGER 1
+#define T_STRING 2
+
+typedef struct
+{
+ int type;
+} t_base;
+
+typedef struct
+{
+ int type;
+ int content;
+} t_integer;
+
+typedef struct
+{
+ int type;
+ char *content;
+} t_string;
+
+typedef union
+{
+ t_base base;
+ t_integer integer;
+ t_string string;
+} t_object;
+
+void print_object (t_object *this)
+{
+ if (this->base.type == T_INTEGER)
+ printf ("Integer: %d\n", this->integer.content);
+ else if (this->base.type == T_STRING)
+ printf ("String: \"%s\"\n", this->string.content);
+}
+
+t_object *new_integer (int i)
+{
+ t_object *p = malloc (sizeof (t_integer));
+ p->integer.type = T_INTEGER;
+ p->integer.content = i;
+ return p;
+}
+
+t_object *new_string (char *s)
+{
+ t_object *p = malloc (sizeof (t_string));
+ p->string.type = T_STRING;
+ p->string.content = s;
+ return p;
+}
+
+int main (void)
+{
+ t_object *object[] = { new_integer (42),
+ new_string ("Hello, world!"),
+ NULL };
+
+ for (int i = 0; object[i]; i++)
+ print_object (object[i]);
+
+ for (int i = 0; object[i]; i++)
+ free (object[i]);
+ return 0;
+}
diff --git a/20210128/unions-1.c b/20210128/unions-1.c
new file mode 100644
index 0000000..b75a606
--- /dev/null
+++ b/20210128/unions-1.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdint.h>
+
+typedef union
+{
+ int8_t i;
+ uint8_t u;
+} num8_t;
+
+int main (void)
+{
+ num8_t test;
+ test.i = -1;
+ printf ("%d\n", test.u);
+ return 0;
+}
diff --git a/20210128/unions-2.c b/20210128/unions-2.c
new file mode 100644
index 0000000..8f3c5d8
--- /dev/null
+++ b/20210128/unions-2.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdint.h>
+
+typedef union
+{
+ char s[8];
+ uint64_t x;
+} num_char_t;
+
+int main (void)
+{
+ num_char_t test = { "Hello" };
+ printf ("%lx\n", test.x);
+ return 0;
+}
diff --git a/20210128/unions-3.c b/20210128/unions-3.c
new file mode 100644
index 0000000..2162c06
--- /dev/null
+++ b/20210128/unions-3.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdint.h>
+
+typedef union
+{
+ char s[8];
+ uint64_t x;
+} num_char_t;
+
+int main (void)
+{
+ num_char_t test = { "Hello" };
+ printf ("%ld\n", test.x);
+ return 0;
+}
diff --git a/20210128/unions-4.c b/20210128/unions-4.c
new file mode 100644
index 0000000..5838bc1
--- /dev/null
+++ b/20210128/unions-4.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdint.h>
+
+typedef union
+{
+ char s[8];
+ uint64_t x;
+} num_char_t;
+
+int main (void)
+{
+ num_char_t test = { x: 478560413000 };
+ printf ("%s\n", test.s);
+ return 0;
+}
--
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