Question

我正在编写一个游戏，让用户猜测随机生成的数字。最后，它将显示正确的总数和正确数字的总和。但是，我无法显示用户具有的正确数字的正确总和。有人可以帮我弄这个吗？谢谢！

public static void main(String[] args) {
    Random rng = new Random();
    Scanner consoleScanner = new Scanner(System.in);
    String inputString;
    int answer = rng.nextInt(90000) + 10000, sum, numberCorrect;
    System.out.print("I have randomly chosen a 5-digit code for you to guess.\n"
            + "Each time you guess, I will tell you how many digits are correct and the sum of the digits that are correct.\n"
            + "For example, if the number is \"68420\" and you guess 12468, I will respond:\n"
            + "Number of Digits Correct: 1\n" + "Sum of Digits Correct   : 4\n"
            + "From deduction, you will know the 4 was correct in the guess.\n\n"
            + "Now its your turn..................................................................\n" + "answer = "
            + answer);
    do {
        System.out.print("\nPlease enter a 5-digit code (your guess): ");
        inputString = consoleScanner.nextLine();
        numberCorrect = 0;
        sum = 0;
        if (inputString.length() != 5) {
            System.out.println("Please enter 5-digit code only.");
            System.exit(0);
        }
        for (int i = 0; i < 5; i++) {
            String answerString = String.valueOf(answer);
            if (inputString.charAt(i) == answerString.charAt(i)) {
                numberCorrect++;
                char digit = answerString.charAt(i);
                sum += digit;
            }
        }
        System.out.println("Number of Digits Correct: " + numberCorrect + "\nSum of Digits Correct:    " + sum);
    }
    while (numberCorrect < 5);
    System.out.println("****HOORAY!  You solved it.  You are so smart****");
}

Answer 1

你的sum变量是整数，你试图将它添加到char（数字）。你需要将字符转换为有效的int，然后将其添加到sum。

以下参考资料可能有所帮助！

Java: parse int value from a char

或

Converting characters to integers in Java

Answer 2

您必须将char转换为数值：

sum += Character.getNumericValue(digit);

猜猜游戏Java

2 个答案: