Question

请帮我解决这个问题。我觉得这很简单，当我说完所有的时候，我可能会感到非常愚蠢。谢谢。

我尝试了很多东西，但似乎都没有用。是的，我对Visual Basic比Java更熟悉，这就是我遇到这个问题的原因。

    import java.util.Scanner;

    public class YuGiOhLifePointCounter {

        static Scanner sc = new Scanner(System.in);
        public static void main(String[] args) {

        double choice_1;
        System.out.print("\nEnter the starting life points for player-1: ");
        choice_1 = sc.nextDouble();

        double storage_1;
        storage_1 = choice_1;

        double choice_2;
        System.out.print("\nEnter the starting life points for player-2: ");
        choice_2 = sc.nextDouble();

        double storage_2;
        storage_2 = choice_2;

        double lp;
        System.out.print("\nEnter a 6 to change the life-points of either player: ");
        lp = sc.nextDouble();

        double display_1 = choice_1;
        double display_2 = choice_2;

        while (lp == 6) {


            /* Starting here*/
            if (display_1 <== 0) {
                System.out.println("Player-2 has won the game.");
                System.exit(0);
            }

            if (display_2 <== 0) {
                System.out.println("Player-1 has won the game.");
                System.exit(0);
            }

            if (display_1 <> 0 && display_2 <> 0) {
            /* these 3 if statements above are giving me illegal import errors, I can't figure out why.  Thank You.*/

                double choose_1_2;
                System.out.print("\nEnter a 1 to change player-1's life-points, or enter a 2 to change player-2's life-points: ");
                choose_1_2 = sc.nextDouble();
                if (choose_1_2 == 1) {
                    double ch_1;
                    System.out.print("\nEnter the number subtracted from or added to player-1's life-points: ");
                    ch_1 = sc.nextDouble();
                    double c_1;
                    System.out.print("\nEnter a 1 to subtract this number from player-1's life-points, or enter a 2 to add this number to player-1's life-points: ");
                    c_1 = sc.nextDouble();
                    if (c_1 == 1) {
                        display_1 = storage_1 - ch_1;
                        System.out.println("\nPlayer-1's life-points are currently " + display_1);
                    }
                    if (c_1 == 2) {
                        display_1 = storage_1 + ch_1;
                        System.out.println("\nPlayer-1's life-points are currently " + display_1);
                    }
                }
                if (choose_1_2 == 2) {
                    double ch_2;
                    System.out.print("\nEnter the number subtracted from or added to player-2's life-points: ");
                    ch_2 = sc.nextDouble();
                    double c_2;
                    System.out.print("\nEnter a 1 to subtract this number from player-2's life-points, or enter a 2 to add this number to player-1's life-points: ");
                    c_2 = sc.nextDouble();
                    if (c_2 == 1) {
                        display_2 = storage_1 - ch_2;
                        System.out.println("\nPlayer-2's life-points are currently " + display_2);
                    }
                    if (c_2 == 2) {
                        display_2 = storage_1 + ch_2;
                        System.out.println("\nPlayer-2's life-points are currently " + display_2);
                    }
                }
            }
        }
    }
}

Answer 1

if (display_1 <= = 0)
if (display_1 <> 0)

不确定你要做的是什么，但这些都不对。

如果您想检查display_1小于0，那么您需要：

if (display_1 < 0)

如果您想检查display_1是否小于或等于0，那么您需要：

if (display_1 <= 0)

如果您想检查display_1等于0，那么您需要：

if (display_1 == 0)

如果您想检查display_1不等于0，那么您需要：

if (display_1 != 0)

我有3个非法的表达错误开始？

1 个答案: