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Plagiarism of programming source codes is an undesirable situation in the many fields of software development world. Especially in educational field, it is obviously realized that plagiarism in programming courses increases consistently. The aim of this study is attempting to answer questions such as “which codes are similar?”,“what similarity ratios are?” in order to prevent plagiarism among university students who attend programming courses. While developing the proposed methodology, N-gram similarity calculation method and Vector Space Model (VSM) were considered. Information Retrieval (IR) System and Cosine Normalization (CN) methods were utilized to calculate similarity ratios. Experimental study was performed on the dataset yielded by changing source code examples in different forms. The results obtained provide convincing evidence that the study is fit the purpose.