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我基本上是在玩 eclipse 来保留我在 Java 课程介绍中学到的东西。我即将参加高级编程，我有一个初学者的问题......

我在下面创建了这个小程序，因为我很难理解方法。现在我已经了解了一般概念，我有一个新问题。我在下面有一个 do while 语句，如果您输入简单加法问题的正确答案，它就会起作用。如果您输入错误的答案，它会要求您再次尝试该问题（如我所愿）。如果您再次输入错误的答案，程序将停止。我希望它提示用户输入答案，直到他们正确为止。我该怎么做呢？ 

import java.util.Scanner; //needed for input

public class PracticeMethod {
    public static void main(String[] args) {
        // Create a Scanner

        System.out.println(");
        System.out.println();
        makesPerfect();
        String anotherRun = "yes";

        Scanner input = new Scanner(System.in);

    }

    static void makesPerfect() {
        Scanner input = new Scanner(System.in);
        String anotherRun;
        do {

            System.out.print(" Math");
            int x = (int) (Math.random() * 10) + 1;
            int y = (int) (Math.random() * 10) + 1;

            System.out.print(" What is " + x + "+" + y + "? ");
            double answer = 0.0;
            answer = input.nextDouble();
            if (answer == x + y) {
                System.out.println(" Yes, you are correct.");

            }
            if (answer != x + y) {
                System.out.print(" No, that is not correct. ");
                System.out.println();
                System.out.print(" Why dont you try again? ");
                System.out.println();
                System.out.println();
                System.out.print(" What is " + x + "+" + y + "? ");
                answer = input.nextDouble();
            }
            System.out.println();

            System.out.print("Enter yes if you want to run again: ");
            anotherRun = input.next();
            input.nextLine(); // causes skipping issue to fix
            System.out.print("\n\n\n");
        } while (anotherRun.equalsIgnoreCase("yes"));
    }
}
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1 回答 1

3

使您的if陈述检查答案是否正确while循环。这样你就可以一直要求正确的答案，直到你得到它。

while(answer != x + y) {
    System.out.print(" No, that is not correct. ");
    System.out.println();
    System.out.print(" Why dont you try again? ");
    System.out.println();
    System.out.println();
    System.out.print(" What is " + x + "+" + y + "? ");
    answer = input.nextDouble();
}

还要感谢正确使用 StackOverflow，并努力学习！也许有一天你会为我回答问题。

于 2013-08-17T19:25:52.103 回答