Move exception handling example into own directory

source-code/ErrorHandling/Exceptions/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(exceptions LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+add_executable(fac.exe fac.cpp)

source-code/ErrorHandling/Exceptions/README.md

@@ -0,0 +1,10 @@
+# Expected
+
+Illustrates how to use exceptoin to do error handling.
+
+## What is it?
+
+1. `fac.cpp`: C++ application that reads an argument from the command line,
+   validates the value, computes the factorial and displays the output or
+   the error message.
+1. `CMakeLists.txt`: CMake file to build the applications.

source-code/ErrorHandling/README.md

@@ -4,8 +4,7 @@ Code illustrations for chapter 3, Modularity in Stroustrup's
 "A tour of C++" on error handling using exceptions.
 
 # What is it?
-1. `fac.cpp`: illustrates exception handling.
-1. `Makefile`: make file for these examples.
-1. `Expected`: illustrates error handling using `std::expected`.
+1. `Exceptions`: illustration of error handling with exceptions.
 1. `MemoryLeak`: illustrates how inappropriately handled exceptions can
    lead to memory leaks, and how to fix that.
+1. `Expected`: illustrates error handling using `std::expected`.