examples from C++ Primer but with own mind/consciousness

src/.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/emacs
+# Edit at https://www.toptal.com/developers/gitignore?templates=emacs
+
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+
+# directory configuration
+.dir-locals.el
+
+# network security
+/network-security.data
+
+
+# End of https://www.toptal.com/developers/gitignore/api/emacs
+
+# Created by https://www.toptal.com/developers/gitignore/api/c++
+# Edit at https://www.toptal.com/developers/gitignore?templates=c++
+
+### C++ ###
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# End of https://www.toptal.com/developers/gitignore/api/c++

src/calculate.cpp

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+#include <iostream>
+
+int main()
+{
+  std::cout << "enter two numbers:" << std::endl;
+  int value1 = 0, value2 = 0;
+  std::cin >> value1 >> value2;
+  std::cout << "The sum of " << value1 << " and " << value2
+	    << " is " << value1 + value2 << std::endl;
+
+  return 0;
+}

src/hello.cpp

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+#include <iostream>
+
+int main()
+{
+  std::cout << "Hello World of C++\n";
+  
+  return 0;
+}