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With the rapid increasing of software project size and maintenance cost,adherence to coding standards especially by managing identifier naming, isattracting a pressing concern from both computer science educators and softwaremanagers. Software developers mainly use identifier names to represent theknowledge recorded in source code. However, the popularity and adoptionconsistency of identifier naming conventions have not been revealed yet in thisfield. Taking forty-eight popular open source projects written in threetop-ranking programming languages Java, C and C++ as examples, an identifierextraction tool based on regular expression matching is developed. In thesubsequent investigation, some interesting findings are obtained. For theidentifier naming popularity, it is found that Camel and Pascal namingconventions are leading the road while Hungarian notation is vanishing. For theidentifier naming consistency, we have found that the projects written in Javahave a much better performance than those written in C and C++. Finally,academia and software industry are urged to adopt the most popular namingconventions consistently in their practices so as to lead the identifier namingto a standard, unified and high-quality road.

How are identifiers named in open source software? About popularity and consistency