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View Compilation Error

0_0_39115421_17942\Main.java:14: 错误: 找不到符号
    public static BigInteger calculateFactorial(int n) {
                  ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_39115421_17942\Main.java:23: 错误: 找不到符号
    public static int countDigits(BigInteger num) {
                                  ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_39115421_17942\Main.java:3: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_39115421_17942\Main.java:3: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
                              ^
  符号:   类 Scanner
  位置: 类 Main
0_0_39115421_17942\Main.java:7: 错误: 找不到符号
            BigInteger factorial = calculateFactorial(num); // Calculate factorial
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_39115421_17942\Main.java:15: 错误: 找不到符号
        BigInteger result = BigInteger.ONE;
        ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_39115421_17942\Main.java:15: 错误: 找不到符号
        BigInteger result = BigInteger.ONE;
                            ^
  符号:   变量 BigInteger
  位置: 类 Main
0_0_39115421_17942\Main.java:17: 错误: 找不到符号
            result = result.multiply(BigInteger.valueOf(i));
                                     ^
  符号:   变量 BigInteger
  位置: 类 Main
8 个错误


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