For the last decades, programming courses are being taught in nearly every educational sector. Students are now more likely to use an e-learning platform compared to traditional system because of lower internet costs, remote access, and faster communication facilities. For a programming course studied in both manual and e-learning platforms, instructors evaluate huge number of programming assignments which is cumbersome since programming assignment checking requires higher accuracy. To mitigate the instructor's job with a satisfactory level of confidence, we developed a system using TF-IDF, generalised graph isomorphism, and token edit distance. The testing outcome of the system reveals a higher level of congruence with a human expert grader.