This example explores the use of the APG Application Programming Interface. The API object will be created and its major features explored.

application code must include header files:
- ../../utilities/utilities.h
- ../../api/api.h
application compilation must include source code from the directories:
- ../../api
- ../../library
- ../../utilities
application compilation must define macros:
- APG_AST

The compiled example will execute the following cases. Run the application with no arguments for application usage.

case 1: Display application information. (type names, type sizes and defined macros)
case 2: Input, concatenate and display multiple grammar files.
case 3: Input, validation fails with bad characters and no final EOL.
case 4: Illustrate a grammar with bad syntax.
case 5: Illustrate a grammar with bad semantics.
case 6: Illustrate generating a parser with and without PPPT.