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我觉得这有点奇怪。我的循环不循环，我不知道为什么。没有错误信息。该程序只运行一次。这是我正在创建的游戏，它让你掷 1-9 骰子，你可以选择从数字 1-9 列表中删除该数字，或删除该数字本身。这应该会发生，直到棋盘中没有数字为止。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;

             }     
         }
    }
}
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1 回答 1

1

这很简单：在嵌套循环中，您没有重新声明i变量，因此使用了与外部循环相同的变量。这样，一旦一个嵌套循环结束，i将等于N，创建正确的条件以使第一个循环在第一个循环之后立即完成。

因此，要么通过在嵌套循环中重新声明i变量来掩盖外部i

for (int i = 1; ...

将int放在i前面会掩盖当前词法范围内的那个。或者，为了提高可读性，为每个循环使用不同的变量名。

于 2013-11-10T16:45:36.923 回答