java - while 循环出现问题

Question

现在对于编程来说还是全新的一周。一直在编写小程序来帮助我记住基础知识。当我运行此代码时，如果我正确输入第一个问题，它会正确运行，但如果我回答错误，然后它会循环回来，我再次回答正确，它会继续循环而不继续执行其余代码。

import java.util.Scanner;

public class Parker {
    public static void main(String []args) {
        Scanner scan = new Scanner(System.in);
        System.out.print("How old are you: ");
        int age = scan.nextInt();
        if (age > 6) {
            System.out.println("You are to old for the program");
        }
        else {
            System.out.println("Welcome to the program, enjoy!");
                    System.out.println("What is 5 + 3? ");
                    int num1 = scan.nextInt();
                    if (num1 == 8) {
                        System.out.println("Correct!");
                    } else {
                        System.out.println("Wrong! I'm telling your DADDY!");
                    }
                    while (num1 != 8) {
                        System.out.println("What is 5 + 3? ");
                        int num9 = scan.nextInt();
                        if (num9 == 8) {
                            System.out.println("Correct!");
                        } else {
                            System.out.println("Wrong! I'm telling your DADDY!");
                    }
                    }
                    System.out.println("What is 3 + 11? ");
                    int num2 = scan.nextInt();
                    if (num2 == 14) {
                        System.out.println("Correct!");
                    } else {
                        System.out.println("Wrong! I'm telling your DADDY!");
                    }
                    System.out.println("What is 7 + 6? ");
                    int num3 = scan.nextInt();
                    if (num3 == 13) {
                        System.out.println("Correct!");
                    }
                    else {
                        System.out.println("Wrong! I'm telling your DADDY!");
                    }
                    System.out.println("What is 11 - 5? ");
                    int num4 = scan.nextInt();
                    if (num4 == 6) {
                        System.out.println("Correct!");
                    }
                    else {
                        System.out.println("Wrong! I'm telling your DADDY!");
                    }
                    System.out.println("What is 4 + 9? ");
                    int num5 = scan.nextInt();
                    if (num5 == 13) {
                        System.out.println("Correct!");
                    }
                    else {
                        System.out.println("Wrong! I'm telling your DADDY!");
                    }
        }
    }
}

Answer 1

while (num1 != 8) {
    System.out.println("What is 5 + 3? ");

    int num9 = scan.nextInt();

    if (num9 == 8) {
        System.out.println("Correct!");
    } else {
        System.out.println("Wrong! I'm telling your DADDY!");
    }
}

代码中的上述条件取决于 num1，但您永远不会在该循环内更改 num1 的值。因此，该循环永远不会终止。