Abstract
This paper presents an automatic grading method DGRADER, which handles complex multifile programs. Both the dynamic and the static grading support multifile program analysis. So, it can be an advantage to handle complex programming problem which requires more than one program file. Dynamic analysis takes advantage of object file linker in compilation to link complex multifile program. The static grading module consists of the following steps. Firstly, the program is parsed into abstract syntax tree, which is mapped into abstract syntax tree data map. Then, the information of preprocessor is used for linking external sources called in main program by complex multifile program linker-fusion algorithm. Next, standardization process is performed for problematic code removal, unused function removal, and function sequence ordering based on function call. Finally, program matching successfully tackles structure variance problem by previous standardization process and by simple tree matching using tag classifier. The novelty of the approach is that it handles complex multifile program analysis with flexible grading with consideration of modularity and big scale of programming problem complexity. The results have shown improvement in grading precision which gives reliable grading score delivered with intuitive system.
Highlights
Automatic Grading System (AGS) is program which can determine student grade automatically based on score objective parameter
We have presented a novel technique to handle complex multifiles program with flexible static and dynamic grading
In order to deal with multifiles program, the dynamic analysis process takes an advantage of the compiler in linking process to compile complex multifile program. e static analysis process uses the presented complex multifiles program linker-fusion algorithm which parsed preprocessor from program AST to find other external sources
Summary
Automatic Grading System (AGS) is program which can determine student grade automatically based on score objective parameter. AGS is needed as popular courses especially in computer science often have hundreds or thousands of students but only a few staff [1]. Programming assignment in these courses is necessary to improve technical programming and problem solving skill of students. Is method is inadequate because first programming course are often typically complex for a lecturer to assess correctness accurately and comprehensively by manual assessment [4]. AGS can become a key role to maintain accuracy and avoid biases as the grading process is based on objective scoring rules. The system must provide immediate feedback to students so they can learn from their mistakes [5], allowing them to make self-learning without an instructor [6]
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