import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class mainClass {
public static void main(String[] args) throws IOException {
Scanner sc = new Scanner(System.in);
String student[][] = new String[10][5];
for (int i = 0; i < student.length; i++) {
for (int j = 0; j < student[i].length; j++) {
student[i][j] = "";
}
}
student[0][0] = 0 + "";
student[0][1] = "lee";
student[0][2] = "24";
student[0][3] = "85";
student[0][4] = "75";
student[1][0] = 1 + "";
student[1][1] = "laa";
student[1][2] = "25";
student[1][3] = "80";
student[1][4] = "70";
student[2][0] = 2 + "";
student[2][1] = "lss";
student[2][2] = "27";
student[2][3] = "65";
student[2][4] = "75";
int memberNum = 3;
while (true) {
System.out.println("===== 비트 학생 성적 조회 프로그램 =====");
System.out.println(
"1.학생정보추가\n2.학생정보 삭제\n3.학생정보 검색\n4.학생정보 수정\n5.학생 성적조회\n6.학생 성적총점\n7.학생성적 평균\n8.학생성적순 출력\n9.메모장 출력\n0.종료");
System.out.print("메뉴를 고르세요: ");
int choice = sc.nextInt();
if (choice == 1) {
// 학생정보 추가
studentAdd(student, sc, memberNum);
} else if (choice == 2) {
// 학생정보 삭제
if (datacheck(student))
studentDel(student, sc);
} else if (choice == 3) {
// 학생정보 검색
if (datacheck(student))
studentSreach(student, sc);
} else if (choice == 4) {
// 학생정보 수정
if (datacheck(student))
studentUpdate(student, sc);
} else if (choice == 5) {
// 학생 성적조회
if (datacheck(student))
studentScoreOne(student, sc);
} else if (choice == 6) {
// 학생 성적총점
if (datacheck(student))
studentScoreTotal(student);
} else if (choice == 7) {
// 학생 성적평균
if (datacheck(student))
studentScoreTotalAvg(student);
} else if (choice == 8) {
// 학생 성적순 정렬 출력
if (datacheck(student))
scorePrint(student);
} else if (choice == 9) {
// 파일로 저장하기
if (datacheck(student)) {
saveFile(student);
}
} else if (choice == 0) {
// 종료
System.out.println("프로그램을 종료합니다.");
break;
}
}
sc.close();
}
private static boolean datacheck(String[][] student) {
for (int i = 0; i < student.length; i++) {
if (!student[i][1].equals("")) {
return true;
}
}
System.out.println("학생정보가 없습니다.");
return false;
}
private static void saveFile(String[][] student) throws IOException {
File file = new File("d:/tmp/studentFile.txt");
FileWriter fWriter = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fWriter);
PrintWriter pw = new PrintWriter(bw);
for (int i = 0; i < student.length; i++) {
for (int j = 0; j < student[i].length; j++) {
pw.print(student[i][j] + " ");
}
pw.print("\n");
}
pw.close();
}
private static void scorePrint(String[][] student) {
int[][] sortStudent = new int[10][2];
int sum = 0;
for (int i = 0; i < student.length; i++) {
if (!student[i][1].equals("")) {
sum = Integer.parseInt(student[i][3]) + Integer.parseInt(student[i][4]);
sortStudent[i][0] = i;
sortStudent[i][1] = sum;
}
}
int temp, temp2; // sorting
for (int i = 0; i < sortStudent.length; i++) {
for (int j = 0; j < sortStudent.length; j++) {
if (sortStudent[i][1] > sortStudent[j][1]) {
temp = sortStudent[i][0];
temp2 = sortStudent[i][1];
sortStudent[i][0] = sortStudent[j][0];
sortStudent[i][1] = sortStudent[j][1];
sortStudent[j][0] = temp;
sortStudent[j][1] = temp2;
}
}
}
for (int i = 0; i < sortStudent.length; i++) { // 출력
int temp3 = sortStudent[i][0];
if (!student[i][1].equals("")) {
System.out.println((i + 1) + "등 이름: " + student[temp3][1] + " 영어: " + student[temp3][2] + " 수학: "
+ student[temp3][3] + " 총점: "
+ (Integer.parseInt(student[temp3][3]) + Integer.parseInt(student[temp3][4])) + " 평균: "
+ ((int) (Integer.parseInt(student[temp3][3]) + Integer.parseInt(student[temp3][4])) / 2.0));
}
}
}
private static void studentScoreTotalAvg(String[][] student) {
double count = 0.0;
int avg = 0;
int sum = 0;
for (int i = 0; i < student.length; i++) {
if (!student[i][1].equals("")) {
sum += (Integer.parseInt(student[i][3]) + Integer.parseInt(student[i][4]));
count++;
}
}
avg = (int) (sum / count);
System.out.println("학생들의 총점 평균은 : " + avg + " 점 입니다.");
}
private static void studentScoreTotal(String[][] student) {
int sum = 0;
for (int i = 0; i < student.length; i++) {
if (!student[i][1].equals("")) {
sum += (Integer.parseInt(student[i][3]) + Integer.parseInt(student[i][4]));
}
}
System.out.println("학생들의 총점은 : " + sum + " 점 입니다.");
}
private static void studentScoreOne(String[][] student, Scanner sc) {
int studentOne = selectOne(student, sc);
if (studentOne != -1) {
System.out.println("학생이름: " + student[studentOne][1] + " 영어점수: " + student[studentOne][3] + " 수학점수: "
+ student[studentOne][4] + " 총점: "
+ (Integer.parseInt(student[studentOne][3]) + Integer.parseInt(student[studentOne][4])) + " 평균: "
+ ((int) (Integer.parseInt(student[studentOne][3]) + Integer.parseInt(student[studentOne][4]))
/ 2.0));
} else {
System.out.println("검색한정보가 없습니다.");
}
}
private static void studentUpdate(String[][] student, Scanner sc) {
int studentOne = selectOne(student, sc);
if (studentOne != -1) {
for (int i = 0; i < student.length; i++) {
if (student[i][1].equals(student[studentOne][1])) {
System.out.println("이름: ");
student[i][1] = sc.next();
System.out.println("나이: ");
student[i][2] = sc.next();
System.out.println("영어점수: ");
student[i][3] = sc.next();
System.out.println("수학점수: ");
student[i][4] = sc.next();
}
}
System.out.println("정보가 수정되었습니다.");
} else {
System.out.println("검색한정보가 없습니다.");
}
}
private static void studentSreach(String[][] student, Scanner sc) {
int studentOne = selectOne(student, sc);
if (studentOne != -1) {
System.out.println("학생이름: " + student[studentOne][1] + " 나이: " + student[studentOne][2]);
} else {
System.out.println("검색한정보가 없습니다.");
}
}
private static void studentDel(String[][] student, Scanner sc) {
int studentOne = selectOne(student, sc);
if (studentOne != -1) {
for (int i = 0; i < student.length; i++) {
if (student[i][1].equals(student[studentOne][1])) {
student[i][0] = "";
student[i][1] = "";
student[i][2] = "";
student[i][3] = "";
student[i][4] = "";
}
}
System.out.println("정보가 삭제되었습니다.");
} else {
System.out.println("검색한정보가 없습니다.");
}
}
private static int selectOne(String[][] student, Scanner sc) {
System.out.print("검색할 학생의 이름을 입력하세요: ");
String name = sc.next();
for (int i = 0; i < student.length; i++) {
if ((student[i][1].equals(name))) {
return i;
}
}
return -1;
}
private static void studentAdd(String[][] student, Scanner sc, int memberNum) {
System.out.println("이름: ");
String name = sc.next();
System.out.println("나이: ");
String age = sc.next();
System.out.println("영어점수: ");
String eng = sc.next();
System.out.println("수학점수: ");
String math = sc.next();
out: for (int i = 0; i < student.length; i++) {
for (int j = 0; j < student[i].length; j++) {
if (student[i][1] == "") {
student[i][0] = memberNum + "";
student[i][1] = name;
student[i][2] = age;
student[i][3] = eng;
student[i][4] = math;
memberNum++;
break out;
}
}
}
}
}