Abstract—The business of software has expanded considerably over the past decades. The majority of the application software needed to execute contemporary generic software was developed in C++. These software applications have developed over time to facilitate business operations depending on shifting client or organizational needs. During such need-based implementations, various changes were incorporated into the application software. Currently, the root documentation has not been updated appropriately. Also altering these programs additionally is the cause of a crash in the software. Altering these application programs to the needs of the target language is hard. Abstracting the useful information dispersed all over the application program is hard. To address these challenges, our study provides a novel approach for abstracting business rules from a given input C++ program. The proposed methodology first restructures the given input C++ program, then extracts design information from the restructured program, and finally expresses the abstracted design information in the form of control flow and data flow tables. The content of the Data Flow Table is used to create the decision tree. This decision tree was further represented as a table for the abstraction of business rules.
 
Keywords—business rules, C++ program, design information, control flow table, data flow table, decision tree, decision tree table, legacy, restructuring


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