java在使用数学时会对代码产生问题。今天

Question

有人能告诉我为什么我的代码不能处理度吗？弧度可以，但在这个任务中，我需要40度。为什么当我使用度时，我只有一个循环步

Working code with Radians。 Not working code with Degrees

Scanner sc=new Scanner(System.in);
double g=8.86,a=40; // a=lenkis
double v0,x,y,t;
boolean bulletInFlight = true;
boolean hitTarget = false;

System.out.println("191RDB107 Vladislavs Fedotovs");
System.out.println("While operators,07,Urans");

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 = 0.1;
while(bulletInFlight) {

    x =v0*t*Math.cos(Math.toDegrees(40));                   ||Main Problem
    y =v0*t*Math.sin(Math.toDegrees(40))-(g*Math.pow(t, 2))/2; ||Main Problem
    System.out.printf("%3.2f\t%7.3f\t%7.3f\n", t, x, y);
    if (x >= 12  && x <= 17 && y <=-2 && y >=-4) // red target 
    {
        bulletInFlight = false;
        hitTarget = true;
        t+=0.05;
    }else if ((x>= 0 && x<=10 && y<0)|| (x>10 && x<12 && y<=-4) ||(x>10 && y<=-4)) // green grass
    {
        bulletInFlight = false;
        t+=0.05;    
    }else
                t+=0.05;
    }if (hitTarget)
     System.out.println("the target was destroyed");

     else
         System.out.println("shot off the target");
    }
}
  [1]: https://i.stack.imgur.com/0nDSl.png
  [2]: https://i.stack.imgur.com/fc2Fq.png

Answer 1

我没有遵循你的代码，但下面的代码看起来很可疑

    x =v0*t*Math.cos(Math.toDegrees(40));                   ||Main Problem
    y =v0*t*Math.sin(Math.toDegrees(40))-(g*Math.pow(t, 2))/2; ||Main Problem

数学。toDegrees将弧度转换为度。但40弧度看起来太大了

也许你的意思是Math.toRadians()