<![CDATA[Computational thinking has become an essential competency in informatics education, yet many senior high school students still encounter difficulties in understanding fundamental programming concepts, particularly C++ operators. This study aims to develop and evaluate an interactive website-based learning media for C++ operator topics to support the improvement of students’ computational thinking skills. The learning media integrates structured instructional materials, interactive programming games, and formative quizzes within a single web platform to promote active and self-paced learning. The study employed a one-group pretest–posttest design involving ten students from grades 10 to 12 who were members of the IT Club at a partner senior high school. Students completed pretests and posttests to measure their computational thinking performance before and after using the learning media. The effectiveness of the developed media was evaluated using the Normalized Gain (N-Gain) analysis to determine the magnitude of learning improvement. The results show that the average pretest score increased from 21.00 to 51.00 in the posttest, with an average N-Gain value of 0.37, which falls into the medium improvement category. These findings indicate that the developed interactive website-based learning media effectively supports students’ understanding of C++ operators and contributes to the development of computational thinking skills through engaging and interactive learning activities. ]]>
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