Java do-while循环不起作用 [英] Java do-while loop isn't working

问题描述

我希望我的程序继续问这个问题，直到得到它可以使用的响应，特别是从0到20的数字。我在这个类上有很多其他东西，所以这里有一个小的摘录while（我已经为所有内容命名了变量）。

I want my program to keep asking the question until it gets a response it can use, specifically a number from 0 to 20. I have a lot of other stuff on this class, so here is a small excerpt where the do-while is (I have named the variables and all that for everything).

public static void main(String[] args) {
    do {
        halp = 1;
        System.out.println("What level is your fort?");
        Scanner sc = new Scanner(System.in);

        try { 
            fortLevel = Integer.parseInt(sc.nextLine()); 
        }
        catch(NumberFormatException e){System.out.println("Numbers only, 0-20"); halp = 0;
    }

    if(halp < 1) {
        work = false;
    }

    if(halp > 1) {
        work = true;
    }

    while(work = false);
}

推荐答案

您正在使用的作业你的而表达式：

You are using an assignment in your while expression:

while(work = false);

您可以替换为

while(work == false);

或更好

while(!work);

---

如果变量 halp 和工作在其他任何地方都没有使用，它们可以被淘汰给你：

---

If variables halp and work are not used anywhere else, they could be eliminated giving you:

do {
   System.out.println("What level is your fort?");
   Scanner sc = new Scanner(System.in);
   try {
    fortLevel = Integer.parseInt(sc.nextLine());
   } catch (NumberFormatException e) {
     System.out.println("Numbers only, 0-20");
   }

} while (fortLevel < 0 || fortLevel > 20);

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