The purpose of this paper is to implement classical test theory (CTT) as C code to obtain statistical analysis, item difficulty, and item discrimination used for the item analysis, and to verify the performance by comparing it with the existing commercial TestAn program. Test theory for item evaluation is divided into CTT and item response theory (IRT). Recently, the IRT has been widely used, but CTT is also used as an item analysis theory along with IRT. In this paper, CTT was directly implemented as C code, compared and analyzed the difference between the results calculated using the actual examinee’s answer sheet and the commercial program for the accuracy of the program calculation result. The formula for CTT was implemented as C language code, and the code was presented so that it could be changed and utilized in various platforms such as Android, Linux, dotNet, etc. Therefore, it is expected that it will be highly utilized in the industrial field that builds an evaluation system.
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