【问题标题】:How do I declare a variable based on user input?如何根据用户输入声明变量?
【发布时间】:2019-10-04 10:23:34
【问题描述】:

我正在尝试创建一个程序来对用户输入的内容进行拼写检查。他们必须正确输入 10 次“type”这个词,它会显示一条消息,说明花了多长时间。
我的问题是结局永远不会到来,它不断要求您输入“类型”。我相信这是因为'while (attempts < required)'。我想我需要做 required = 正确的尝试。 if attempt = type,那么它将产生 1 个正确的值。任何帮助表示赞赏。也很抱歉,我不知道如何构造问题

    public static void printHeading(String heading) {

        System.out.println(heading.toUpperCase());

        for (int i = 0; i < heading.length(); i++)
            System.out.print("=");
        System.out.println();
        System.out.println();
    }


    public static int runTutorial(Scanner in, String word, int required) {
        Scanner sc = new Scanner(System.in);
        String attempt = word;
        int correct = 0;
        int attempts = 0;

        while (attempts<required) 
        {
            System.out.print("Enter '" + word + "': ");
            attempt = sc.nextLine();

            if(attempt.equals("type")) {

                System.out.println("Correct");
            }   
            else {
                System.out.println("Try again");
            }
        }
        return attempts;

    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final int TIMES = 10; //required number of correct repetitions
        final String WORD = "type"; //the word to type
        long startTime, endTime; //start and end time of typing test
        double seconds; //elapsed time in seconds
        int attempts;

        printHeading("Typing Tutor");
        System.out.println("You need to type a word " + TIMES +
                           " times correctly, as quickly as you can");
        System.out.println("Your word today will be '" + WORD + "' (do not enter the quotes)");
        System.out.println();
        System.out.println("Type anything and press enter to begin");

        //The test
        System.out.println("Press enter to start the test");
        sc.nextLine();
        startTime = System.currentTimeMillis();
        attempts = runTutorial(sc, WORD, TIMES);
        endTime = System.currentTimeMillis();

        //Test report
        seconds = (double)(endTime - startTime) / 1000;
        System.out.println("You took " + seconds + " seconds and " + attempts +
                           " attempts to correctly type '" + WORD + "' " + TIMES + " times");
        System.out.println();
        printHeading("Come back for more pracice soon");
    }

}

【问题讨论】:

  • 你忘了在你的while循环中增加attempts,它的值总是0
  • 这与声明变量有什么关系?
  • @JohnSmith 你的问题不清楚。如果您希望我们帮助您,我建议您先学习基本术语。有声明一个变量,实例化一个变量,设置一个变量的值。不,它们不一样。必须先声明一个变量,然后才能梦想使用它,这是真的。但是你在标题中的问题是关于声明一个变量,你的解释是关于一些不同的东西

标签: java user-input variable-declaration


【解决方案1】:

System.out.println("Correct");下,attempts变量需要自增,否则会保持为0。

if(attempt.equals("type")) {

    System.out.println("Correct");
    attempts++; // <-- here
} 

【讨论】:

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