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[String: [String: String]] ?? [:] +var studentData: [String : [String: String]] = localStudentData + +var gradeType = ["A+" : 4.5, "A0": 4, "B+": 3.5, "B0": 3, "C+": 2.5, "C0": 2, "D+": 1.5, "D0": 1, "F": 0] + +func selectOption() { + print("원하는 기능을 입력해주세요 \n1: 학생추가, 2: 학생삭제, 3: 성적추가(변경), 4: 성적삭제, 5: 평점보기, X: 종료") + userOption = readLine() + + guard let option = userOption else { + return inputError("뭔가 입력이 잘못되었습니다. 1~5 사이의 숫자 혹은 X를 입력해주세요.") + } + + switch option { + case "X": + exit() + case "1": + addStudent() + case "2": + deleteStudent() + case "3": + addAndUpdateGrade() + case "4": + deleteGrade() + case "5": + viewRatings() + default: + inputError("뭔가 입력이 잘못되었습니다. 1~5 사이의 숫자 혹은 X를 입력해주세요.") + break + } + + if option != "X" && 1...5 ~= Int(option)! { + selectOption() + } +} + +func addStudent() { + print("추가할 학생의 이름을 입력해주세요") + let studentName = readLine() + + guard let name = (studentName?.trimmingCharacters(in: .whitespaces) != "" ? studentName : nil) else { + return inputError() + } + + if studentData[name] != nil { + return inputError("\(name)은 이미 존재하는 학생입니다. 추가하지 않습니다.") + } + + studentData[name] = [:] + store.set(studentData, forKey: "studentData") + print("\(name) 학생을 추가했습니다.") +} + +func deleteStudent() { + print("삭제할 학생의 이름을 입력해주세요") + let studentName = readLine() + + guard let name = (studentName?.trimmingCharacters(in: .whitespaces) != "" ? studentName : nil) else { + return inputError() + } + + if studentData[name] == nil { + return inputError("\(name) 학생을 찾지 못했습니다.") + } + + studentData.removeValue(forKey: name) + store.set(studentData, forKey: "studentData") + print("\(name) 학생을 삭제하였습니다.") +} + +func addAndUpdateGrade() { + print("성적을 추가할 학생의 이름, 과목 이름, 성적(A+, A0, F 등)을 띄어쓰기로 구분하여 차례로 작성해주세요. \n입력예) Mickey Swift A+ \n만약에 학생의 성적 중 해당 과목이 존재하면 기존 점수가 갱신됩니다.") + let inputData = readLine() + guard let splitData = inputData?.split(separator: " ") else { + return inputError() + } + + if splitData.count != 3 { return inputError() } + if studentData[String(splitData[0])] == nil || gradeType[String(splitData[2])] == nil { + return inputError() + } + + let studentName = String(splitData[0]) + let subject = String(splitData[1]) + let grade = String(splitData[2]) + + var student = studentData[studentName]! + student.updateValue(grade, forKey: subject) + studentData.updateValue(student, forKey: studentName) + store.set(studentData, forKey: "studentData") + + print("\(studentName) 학생의 \(subject) 과목이 \(grade)로 추가(변경)되었습니다.") +} + +func deleteGrade() { + print("성적을 삭제할 학생의 이름, 과목 이름을 띄어쓰기로 구분하여 차례로 작성해주세요 \n입력예) Mickey Swift") + let inputData = readLine() + guard let splitData = inputData?.split(separator: " ") else { return inputError() } + if splitData.count != 2 { return inputError() } + + if studentData[String(splitData[0])] == nil { + return inputError("\(String(splitData[0])) 학생을 찾지 못했습니다.") + } + + let studentName = String(splitData[0]) + let subject = String(splitData[1]) + + var student = studentData[studentName]! + student.removeValue(forKey: subject) + studentData.updateValue(student, forKey: studentName) + store.set(studentData, forKey: "studentData") + + print("\(studentName) 학생의 \(subject) 과목의 성적이 삭제되었습니다.") +} + +func viewRatings() { + print("평점을 알고싶은 학생의 이름을 입력해주세요") + let studentName = readLine() + + guard let name = (studentName?.trimmingCharacters(in: .whitespaces) != "" ? studentName : nil) else { + return inputError() + } + + guard let student = studentData[name] else { + return inputError("\(name) 학생을 찾지 못했습니다.") + } + + if student.count == 0 { + return inputError("\(name) 학생의 출력할 성적 데이터가 없습니다.") + } + + var score = 0.0 + for data in student { + print("\(data.0): \(data.1)") + score += Double(gradeType[data.1]!) + } + + let grade = String(format: "%.2f", score / Double(student.count)) + print("평점 : \(grade)") +} + +func exit() { + print("프로그램을 종료합니다...") +} + +func inputError(_ message: String = "입력이 잘못되었습니다. 다시 확인해주세요.") { + print(message) + selectOption() +} + +// start +selectOption()