Question

我觉得这有点奇怪。我的循环不循环，我不知道为什么。没有错误消息。该程序只运行一次。这是我正在制作的游戏，它会让你掷出1-9个骰子，你可以选择从数字1-9列表中删除该数字，或者删除数字本身。这是支持发生，直到董事会中没有剩余数字。但是......循环不循环!!!

public class gudmundur_skilaverkefni9 {
    public static void main (String[] args) {
        System.out.println("Godan dag. Thu ert ad spila Larus.");
        System.out.println("1 2 3 4 5 6 7 8 9");
        int N = 9;
        boolean[] Spilafylki = new boolean[10];

        for (int i = 1; i <= N; i++) {
            System.out.println("Sladu inn slembitolu til ad kasta teningunum.");

            int teningakast = StdIn.readInt();
            int teningatala = (int) (Math.random() * 10);

            System.out.println("Thu fekkst " + teningatala + ".");

            if (teningatala != 2) {
                System.out.println("Viltu taka ut " + teningatala 
                        + " eda velja tvaer tolur sem mynda summu af " 
                        + teningatala + "? (1/2)");

            int tala2 = StdIn.readInt();

            if (tala2 == 2) {
                System.out.println("Slaid inn fyrri tolu:");
                int fyrritala = StdIn.readInt();

                System.out.println("Slaid inn seinni tolu:");
                int seinnitala = StdIn.readInt();

                while (fyrritala+seinnitala != teningatala 
                                            || fyrritala == seinnitala){
                    System.out.println("Thetta gengur ekki! Valdirdu nokkud somu toluna tvisvar? Reyndu aftur:");

                    System.out.println("Slaid inn fyrri tolu:");
                    fyrritala = StdIn.readInt();

                    System.out.println("Slaid inn seinni tolu:");
                    seinnitala = StdIn.readInt();
                }

                System.out.println("Nu litur spilid svona ut:");

                Spilafylki[fyrritala] = true;
                Spilafylki[seinnitala] = true;

                for (i = 1; i <= N; i++) {
                    if (Spilafylki[i] == false)
                        System.out.print(i + " ");
                    else
                        System.out.print(" ");
                }

                System.out.println();
            }

            if (tala2 == 1) {
                Spilafylki[teningatala] = true;

                System.out.println("Nu litur spilid svona ut:");

                for (i = 1; i <= N; i++) {

                    if (Spilafylki[i] == false)
                        System.out.print(i + " ");
                    else
                        System.out.print(" ");
                }

                System.out.println();
            }
        }
        else {
            System.out.println("Thu fekkst tvo. Ekki er hægt ad velja tvaer olikar natturulegar tolur sem mynda 2.");

            System.out.println("Nu litur spilid svona ut:");

            Spilafylki[teningatala] = true;

            for (i = 1; i <= N; i++) {
                if (Spilafylki[i] == false)
                    System.out.print(i + " ");
                else
                    System.out.print(" ");
            }
            System.out.println();

            int count = 0;

            for (i = 1; i <= N; i++)
                if (Spilafylki[i] == true)
                    count++;

             if (count == 9) {
                System.out.println("Allar tolurnar eru farnar. Takk fyrir ad spila Larus.");
                    break;

             }     
         }
    }
}

Answer 1

这很简单：在嵌套循环中，您不会重新声明 i 变量，因此使用外部循环相同的变量。这样，只要其中一个嵌套循环结束， i 将等于 N ，创建正确的条件，使第一个循环在第一个循环后立即完成周期。

所以，要么通过在嵌套循环中重新声明 i 变量来掩盖外部的 i

for (int i = 1; ...

在 i 前放置 int 会遮盖当前词法范围中的那个。或者，为了更具可读性，请为每个循环使用不同的变量名称。

我的循环不循环

1 个答案: