Chapter 27

Author: Carlo Lanzi Luciani

README.md

@@ -1,27 +1,4 @@
 topic 1: learncpp.com (one day I will be able to write here 'FINISHED!')
-Bookmark:       27.1
-(at the end of ch26, return to check the lesson 24.9 on the navtab 'for advanced readers')
-
-
-
-topic 2: learn smt about computer networks from the book 'a top down approach' + exercises
-Bookmark (ch.section(.subsection)):    2.3.1  (remember: do exercises at the end of section)
-
-
-
-
-topic 2b: practice of topic2 following the website of the book
-Bookmark: HTTP of the wireshark lab
-
-topic 2c: interactive quiz from the website of Kurose, basic exercises that chatgpt suggests to learn networking with libraries cpp and c.
-
------------------------------ already done -------------------------------
-
-
-
-
------------------------------ future topics --------------------------------
-julia basics (main motivation: mathematical and physical easy simulations and models. On the worst case ask chatgtp to create them for you, but then where's the fun for it? And also for complicated stuff it becomes inefficient to ask the AI, because you must thoroughly communicate your idea)
-following: ch1-4, appendix d-e of `Paul D. McNicholas, Peter A. Tait - Data Science with Julia-CRC Press (2019)`
-
+Bookmark:       28.1
 
+already dealt with: appendix C. I will skip appendix B.

learncpp.com-v09.2023/bookmark.txt

@@ -0,0 +1,48 @@
+/*     Write a Fraction class that has a constructor that takes a numerator and a denominator. If the user passes in a denominator of 0, throw an exception of type std::runtime_error (included in the stdexcept header). In your main program, ask the user to enter two integers. If the Fraction is valid, print the fraction. If the Fraction is invalid, catch a std::exception, and tell the user that they entered an invalid fraction.
+
+Here’s what one run of the program should output:
+
+Enter the numerator: 5
+Enter the denominator: 0
+Invalid denominator
+*/
+
+#include <iostream>
+#include <stdexcept>
+#include <exception>
+
+class Fraction
+{
+private:
+	int m_numerator {};
+	int m_denominator {};
+
+public:
+	Fraction(int numerator, int denominator)
+	: m_numerator(numerator), m_denominator(denominator)
+	{
+		if(!denominator) { throw std::runtime_error{"Invalid denominator"}; }
+	}
+};
+
+
+int main(void)
+{
+	std::cout << "Enter the numerator of your fraction: ";
+	int numerator {};
+	std::cin >> numerator;
+
+	std::cout << "Enter the denominator of your fraction: ";
+	int denominator {};
+	std::cin >> denominator;
+
+	try { Fraction fraction{numerator, denominator}; }
+
+	catch(std::exception& exception)
+	{
+		std::cerr << exception.what() << '\n';
+		return 0;
+	}
+
+	return 0;
+}