added ws202425 courses

2024-11-14 13:11:04 +01:00
parent 800282c2e8
commit beb31897b1
461 changed files with 20368 additions and 0 deletions
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+/* Informatik B - Sommersemester 2022
+Übung 06
+Katharina Klost
+
+Aufgabe zu Pointern
+
+g++ -std=c++14 -Wall -Wextra -Werror -pedantic ./w7/ueb7pointer.cpp -o ./bin/ueb7pointer && ./bin/ueb7pointer
+
+*/
+
+#include <iostream>
+
+void ref(int &alpha)
+{ // Call-by-Reference
+	std::cout << "&alpha: " << (&alpha) << std::endl;
+	std::cout << "alpha: " << (alpha) << std::endl;
+	alpha++;
+}
+
+void val(int alpha)
+{ // Call-by-Value
+	std::cout << "&alpha: " << (&alpha) << std::endl;
+	std::cout << "alpha: " << (alpha) << std::endl;
+	alpha++;
+}
+
+void func1(int *alpha)
+{
+	std::cout << "&alpha: " << (&alpha) << std::endl;
+	std::cout << "alpha: " << (alpha) << std::endl;
+	alpha++;
+}
+
+void func2(int *alpha)
+{
+	std::cout << "&alpha: " << (&alpha) << std::endl;
+	std::cout << "alpha: " << (alpha) << std::endl;
+	(*alpha)++;
+}
+
+int main()
+{
+
+	// Zeichnen Sie Speicherbilder, die veranschaulichen Sie was hier passiert.
+	// Erklären Sie die entsprechenden Ausgaben.
+
+	int a = 42;
+	int b = 6;
+	int *c = &a;
+	int *d = &b;
+	int &e = a;
+
+	std::cout << "a: " << a << std::endl;
+	std::cout << "b: " << b << std::endl;
+	std::cout << "c: " << c << std::endl;
+	std::cout << "d: " << d << std::endl;
+	std::cout << "e: " << e << std::endl;
+	std::cout << std::endl;
+	std::cout << "&a: " << (&a) << std::endl;
+	std::cout << "&b: " << (&b) << std::endl;
+	std::cout << "&c: " << (&c) << std::endl;
+	std::cout << "&d: " << (&d) << std::endl;
+	std::cout << "&e: " << (&e) << std::endl;
+
+	std::cout << std::endl;
+
+	// std::cout << (*a) << std::endl; Warum geht das nicht?
+	// std::cout << (*e) << std::endl; Warum geht das nicht?
+
+	std::cout << "*c: " << (*c) << std::endl;
+	std::cout << "*d: " << (*d) << std::endl;
+	std::cout << std::endl;
+	std::cout << "=== Skizzieren Sie den Aufbau des Speichers zu diesem Zeitpunkt ===" << std::endl;
+	std::cout << std::endl;
+
+	a = *c * *d;
+	std::cout << "a: " << a << std::endl;
+	*d -= 3;
+	std::cout << "*d: " << (*d) << std::endl;
+	b = a * b;
+	std::cout << "b: " << b << std::endl;
+	c = d;
+	std::cout << "*c: " << (*c) << std::endl;
+
+	std::cout << std::endl;
+	std::cout << "=== Skizzieren Sie den Aufbau des Speichers zu diesem Zeitpunkt ===" << std::endl;
+	std::cout << std::endl;
+
+	b = 7;
+	std::cout << "b: " << b << std::endl;
+	a = *c + *d;
+	std::cout << "a: " << a << std::endl;
+	std::cout << "&e: " << (&e) << std::endl;
+	std::cout << std::endl;
+	std::cout << std::endl;
+
+	c = &a;
+
+	std::cout << std::endl;
+	std::cout << "=== Skizzieren Sie den Aufbau des Speichers zu diesem Zeitpunkt ===" << std::endl;
+	std::cout << std::endl;
+
+	std::cout << std::endl;
+	std::cout << "== Erklären Sie die folgenden Ausgaben ==" << std::endl;
+	std::cout << std::endl;
+
+	std::cout << "a: " << a << std::endl;
+	std::cout << "&a: " << (&a) << std::endl;
+	std::cout << "Rufe ref(a) auf" << std::endl;
+	ref(a);
+	std::cout << std::endl;
+
+	std::cout << "a: " << a << std::endl;
+	std::cout << "&a: " << (&a) << std::endl;
+	std::cout << "Rufe val(a) auf" << std::endl;
+	val(a);
+	std::cout << std::endl;
+
+	std::cout << "a: " << a << std::endl;
+
+	std::cout << "c: " << c << std::endl;
+	std::cout << "&c: " << (&c) << std::endl;
+	std::cout << "Rufe func1(c) auf" << std::endl;
+	func1(c);
+	std::cout << std::endl;
+
+	std::cout << "c: " << c << std::endl;
+	std::cout << "&c: " << (&c) << std::endl;
+
+	std::cout << "Rufe func2(c) auf" << std::endl;
+	func2(c);
+	std::cout << "c: " << c << std::endl;
+	std::cout << "&c: " << (&c) << std::endl;
+	std::cout << "a: " << a << std::endl;
+}