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Assume that there are N courses, each course has course number, course name, course properties, total hours, teaching hours, laboratory, or the machine hours, credits. Semester and other information, students may be required (such as not less than 60 total credits ) free choices. try to design a system of elective courses, so that it can provide the following functions: (1) system to work the way the menu (2) course information and student enrollment information into the function (program information with the file) __ input ( 3) The output of program information browsing __ (4) search function (at least one query mode) __ algorithm (5) on credit inquiries (6) Students taking a course situation (optional)