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[String], + let savedScores = defaults.dictionary(forKey: "StudentScores") as? [String: String] { + return (Set(savedNames), savedScores) + } + + return nil +} + + +func saveData(names: Set, scores: [String: String]) { + let defaults = UserDefaults.standard + + let savedNames = Array(names) + defaults.set(savedNames, forKey: "StudentNames") + defaults.set(scores, forKey: "StudentScores") +} + +func appendName() { + print("추가할 학생의 이름을 입력해주세요.") + let input = readLine()! + if input.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { + print("입력이 잘못되었습니다. 다시 확인해주세요\n") + } + else if studentNames.contains(input) == true { + print("\(input)은 이미 존재하는 학생입니다. 추가하지 않습니다.\n") + } + else { + studentNames.insert(input) + print("\(input) 학생을 추가했습니다.") + } +} + +func deleteName() { + print("삭제할 학생의 이름을 입력해주세요.") + let input = readLine()! + if input.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { + print("입력이 잘못되었습니다. 다시 확인해주세요\n") + } + else if studentNames.contains(input) == true { + studentNames.remove(input) + print("\(input) 학생을 삭제했습니다.\n") + } + else { + print("\(input) 학생을 찾지못했습니다.") + } +} + +func appendScore() { + print("성적을 추가할 학생의 이름, 과목 이름, 성적( A+, A0, F 등)을 띄어쓰기로 구분하여 차례로 작성해주세요.") + print("입력 예) Beom Swift A+") + print("만약에 학생의 성적 중 해당 과목이 존재하면 기존 점수가 갱신됩니다. ") + let input = readLine()! + let components = input.components(separatedBy: " ") + let score = components.contains("A+") || components.contains("A0") || components.contains("B+") || components.contains("B0") || components.contains("C+") || components.contains("C0") || components.contains("D+") || components.contains("D0") || components.contains("F") + + if studentNames.contains(components.first!) { + + if components.count >= 2 && score { + let key = components.dropLast().joined(separator: " ") + let value = components.last + studentScores[key] = value + } + else { + print("입력이 잘못되었습니다. 다시 확인해주세요.") + } + } + else { + print("학생 명단에 없는 학생입니다.") + } + +} + +func deleteScore() { + print("성적을 삭제할 이름, 과목 이름을 띄어쓰기로 구분하여 차례로 작성해주세요.") + print("입력 예) Beom Swift") + + let input = readLine()! + let components = input.components(separatedBy: " ") + + if studentScores.keys.contains(input) { + studentScores.removeValue(forKey: input) + print("\(components[0])의 \(components[1])과목의 성적이 삭제되었습니다.") + } + else if studentNames.contains(components.first!) == false { + print("\(components.first!) 학생을 찾지 못했습니다.") + } + else { + print("\(components[1]) 과목을 찾지 못했습니다.") + } + +} + +func averageScore() { + print("평점을 알고싶은 학생의 이름을 입력해주세요") + var sum = 0.0 + var count = 0.0 + var aver = 0.0 + let input = readLine()! + if input.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { + print("입력이 잘못되었습니다. 다시 확인해주세요\n") + } + else if studentNames.contains(input) == false { + print("\(input) 학생을 찾지 못했습니다.") + } + else { + for (key,value) in studentScores { + if key.contains(input) { + print("\(key.components(separatedBy: " ")[1]) : \(value)") + count += 1.0 + sum += gradeScore[value] ?? 0.0 + } + + } + aver = sum / count + print("평점: \(aver)") + } + +} +if let savedData = loadSavedData() { + studentNames = savedData.names + studentScores = savedData.scores + + while programRun { + + print("원하는 기능을 입력해주세요\n") + print("1: 학생추가, 2: 학생삭제, 3: 성적추가(변경), 4:성적삭제, 5: 평점보기, X: 종료\n") + + let input = readLine() + switch input { + case "1": + appendName() + case "2": + deleteName() + case "3": + appendScore() + case "4": + deleteScore() + case "5": + averageScore() + case "x","X": + programRun = false + default: + print("뭔가 입력이 잘못되었습니다. 1 ~ 5 사이의 숫자 혹은 X를 입력해주세요\n") + + + } + } + +} +else { + + while programRun { + + print("원하는 기능을 입력해주세요\n") + print("1: 학생추가, 2: 학생삭제, 3: 성적추가(변경), 4:성적삭제, 5: 평점보기, X: 종료\n") + + let input = readLine() + switch input { + case "1": + appendName() + case "2": + deleteName() + case "3": + appendScore() + case "4": + deleteScore() + case "5": + averageScore() + case "x","X": + programRun = false + default: + print("뭔가 입력이 잘못되었습니다. 1 ~ 5 사이의 숫자 혹은 X를 입력해주세요\n") + } + } + saveData(names: studentNames, scores: studentScores) + +}