노재경_homework4.java

// 노재경
import java.util.Scanner;
import java.util.Random;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("[주민등록번호 생성]");

        System.out.print("출생년월일을 입력해주세요 (yyyy.mm.dd): ");
        String birthDate = scanner.nextLine();
 
        System.out.print("성별을 입력해주세요 (m/f): ");
        String gender = scanner.nextLine();
        
        // 년월일 분리
        String[] dateParts = birthDate.split("\\.");
        int year = Integer.parseInt(dateParts[0]);
        int month = Integer.parseInt(dateParts[1]);
        int day = Integer.parseInt(dateParts[2]);

        String firstPart = String.format("%02d%02d%02d", year % 100, month, day);

        String genderDigit = (gender.equalsIgnoreCase("m")) ? "2" : "4";

        // 뒤쪽 6자리 랜덤 생성
        String randomNumString = String.format("%06d", new Random().nextInt(999999) + 1);

        // 생성결과물 결합 
        String socialNum = firstPart + "-" + genderDigit + randomNumString;

        scanner.close();
        System.out.println(socialNum);
    }
}