//Course Menu public static void addCourseMenu() { Console.Clear(); Console.WriteLine("ADD A COURSE"); Console.WriteLine("Please input the course name"); String courseName = Console.ReadLine(); //Course name check, maybe later Console.WriteLine("Please input the course credit"); int courseCredit = InputValidation.checkCredit(Console.ReadLine()); Console.WriteLine("Please input the number of max student"); int courseMaxStudent = InputValidation.checkMaxStudent(Console.ReadLine()); if (courseCredit == -1 && courseMaxStudent == -1) { school.addCourse(courseName); } else { if (courseMaxStudent == -1) { school.addCourse(courseCredit, courseName); } else { if (courseCredit == -1) { school.addCourse(courseName, courseMaxStudent); } else { school.addCourse(courseName, courseMaxStudent, courseCredit); } } } Console.WriteLine("Done"); Console.WriteLine("Press any key to continue"); Console.ReadLine(); }