Install aplus-fsf-dev by entering the following commands in the terminal:
sudo apt update sudo apt install aplus-fsf-dev
A+ programming language development environment
A+ is a powerful and efficient programming language. It is freely available under the GNU General Public License. It embodies a rich set of functions and operators, a modern graphical user interface with many widgets and automatic synchronization of widgets and variables, asynchronous execution of functions associated with variables and events, dynamic loading of user compiled subroutines, and many other features. Execution is by a rather efficient interpreter. A+ was created at Morgan Stanley. Primarily used in a computationally-intensive business environment, many critical applications written in A+ have withstood the demands of real world developers over many years. Written in an interpreted language, A+ applications tend to be portable. . This is a metapackage that provides a complete A+ development environment. The A+ run-time environment is provided by the aplus-fsf package.