关于学生选课系统的c语言编程。假定有n门课程，每门课程有课程编号、课程名称、课程性质、总学时、授课学时、实验或商机学时、血粉、开课学期等信息，学生可按要求（如总学分不得少于60）自由选课。-C programming language student elective system. Assume that there are n courses, each course course number, course name, course nature, total hours, teachi