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Code:1234 "c programming (5th edition)" is edited by Tan Haoqiang and published by Tsinghua University publishing house on 20 17. it is a national-level textbook for general higher education planning, an excellent project textbook for Beijing higher education, and a national textbook for the curriculum system planning of computer basic education in colleges and universities. This textbook can be used as a formal textbook for all majors in colleges and universities, and it is also suitable for readers to learn by themselves.