移除 break 语句

Question

我需要删除代码中的 break; 语句，但我运行不知道该怎么做。你能帮帮我吗？

        Scanner sc = new Scanner(System.in);
        double g = 1.62, v0, deg = 45;
        double inRadians = Math.toRadians(deg);
        double t, x, y, x0 = 0, y0 = 0;
        boolean hitTarget = false;
        boolean hitObstacle = false;
        System.out.println("211RDB121 Pauls Daniels Meija 11.grupa");
        System.out.print("v0=");
        if (sc.hasNextDouble())
            v0 = sc.nextDouble();
            else {
                System.out.println("input-output error");
                sc.close();
                return;
            }
        sc.close();
        System.out.println("result:");
        System.out.println("t \t x \t y");
        t = 0.15;
        do {
            x = v0 * t * Math.cos(inRadians) + x0;
            y = v0 * t * Math.sin(inRadians) - (g * t * t) / 2 + y0;
            System.out.printf("%3.2f\t%7.3f\t%7.3f\n", t, x, y);
            if (x >= 17 && x <= 20 && y <= 3 && y >= 0) {
                hitTarget = true;
                break;
            }
            else if (x >= 7 && x <= 10 && y <= 4 && y >= 0) {
                hitObstacle = true;
                break;
            }
            t += 0.1;
            } while (y >= 0);
                if (hitObstacle) {
                    System.out.println("hit the obstacle!");
                }
                else if (hitTarget)
                    System.out.println("the target was destroyed");
                else
                    System.out.println("shot off the target");
            }```

Answer 1

如果在 while 中包含要触发中断的语句，则可以消除中断。由于您使用“if”来设置一个简单的标志，您可能希望通过直接使用值设置标志来简化事情；另外，如果你介意“t”，你应该放置一个“if”，以确保当任何“if”语句为真时，它不会被修改。 do while 应该是这样的：

do  {
       x = v0 * t * Math.cos(inRadians) + x0;
       y = v0 * t * Math.sin(inRadians) - (g * t * t) / 2 + y0;
       System.out.printf("%3.2f\t%7.3f\t%7.3f\n", t, x, y);

       hitTarget = x >= 17 && x <= 20 && y <= 3 && y >= 0;
       hitObstacle = !hitTarget && x >= 7 && x <= 10 && y <= 4 && y >= 0;

       if(!hitTarget && !hitObstacle) {
           t += 0.1;
       }

   } while (y >= 0 || (!hitTarget && !hitObstacle));

Answer 2

boolean run = true;
do {
    x = v0 * t * Math.cos(inRadians) + x0;
    y = v0 * t * Math.sin(inRadians) - (g * t * t) / 2 + y0;
    System.out.printf("%3.2f\t%7.3f\t%7.3f\n", t, x, y);
    
    hitTarget = x >= 17 && x <= 20 && y <= 3 && y >= 0;
    hitObstacle = !hitTarget && x >= 7 && x <= 10 && y <= 4 && y >= 0;

    if (!hitTarget && !hitObstacle) {
        t += 0.1;
    }
    
    run = y >= 0 && !hitTarget && !hitObstacle;
} while (run);

移除 break 语句

Remove break statement

java

do-while