Comments

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  -2

  

  scu10156181  commented on June 21, 2024, 1:41 p.m.

  第五筆測資有誤 曾經通過的程式碼現在無法通過

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  0

  

  scu10156153  commented on Jan. 11, 2024, 11:26 a.m. ← edit 3 →

  給不會的人做參考，我花了超多時間在改 import java.util.Scanner;

  public class test_3 {

  public static void main(String[] args) {
      Scanner scanner = new Scanner(System.in);
  
      String idNumber = scanner.nextLine();
  
      // 檢查身分證格式
      if (!isValidFormat(idNumber)) {
          System.exit(0);
          return;
      }
  
      // 檢查身分證號是否有效
      if (validateIdNumber(idNumber)) {
          System.out.println("為有效的身分證字號");
      } else {
          System.out.println("為無效的身分證字號");
      }
  }
  
  // 檢查身分證格式是否正確
  public static boolean isValidFormat(String idNumber) {
      if (idNumber.length() != 10) {
          System.out.println("身分證號非10碼");
          return false;
      }
  
      char firstChar = idNumber.charAt(0);
      if (!Character.isUpperCase(firstChar) || !Character.isLetter(firstChar)) {
          System.out.println("身分證號首碼有誤");
          return false;
      }
  
      for (int i = 1; i < idNumber.length(); i++) {
          if (!Character.isDigit(idNumber.charAt(i))) {
              System.out.println("身分證號數字部分有誤");
              return false;
          }
      }
  
      return true;
  }
  
  // 驗證身分證號是否有效
  public static boolean validateIdNumber(String idNumber) {
      char firstChar = idNumber.charAt(0);
      int firstDigit = charToNumber(firstChar);
  
      // 檢查邏輯
      int[] weights = { 8, 7, 6, 5, 4, 3, 2, 1 };
  
      int sum = firstDigit / 10 * 1 + firstDigit % 10 * 9; // 將轉換後的數字加入總和
  
      for (int i = 1; i < idNumber.length() - 1; i++) {
          int digit = Character.getNumericValue(idNumber.charAt(i));
          sum += digit * weights[i-1];
      }
  
      int remainder = sum % 10;
      int checkCode = (remainder == 0) ? 0 : 10 - remainder;
  
      // 檢查驗證碼是否與身份證相符
      return checkCode == Character.getNumericValue(idNumber.charAt(9));
  }
  
  private static int charToNumber(char c) {
      c = Character.toUpperCase(c);
      if (c >= 'A' && c <= 'H') {
          return c - 'A' + 10;
      } else if (c >= 'J' && c <= 'N') {
          return c - 'J' + 18; // P is mapped to 23, Q to 24, and so on
      } else if (c >= 'P' && c <= 'Z') {
          return c - 'P' + 23; // P is mapped to 23, Q to 24, and so on
      } else if (c == 'I') {
          return 34;
      } else if (c == 'O') {
          return 35;
      } else {
          return -1; // Invalid character
      }
  }

  }