java double 计算不正确

Question

我正在为一个类(class)制作这个程序，我需要猜测一个数字的立方根。这是我的代码:

int N = Integer.parseInt(args[0]);

//sets the guess at 1.0
guess = 1.0;

//whether or not the guess is close to N
while (guess * guess * guess <= N ){

     double show = (guess + ((1/3) * ((N / (guess * guess)) - guess)));
     System.out.println(show);
     guess = show;
     continue;

}

但是，每次我运行这个程序时，双重显示总是设置为值 1。谁能告诉我为什么会发生这种情况以及如何解决它？

Answer 1

1/3 = 0

因为 1/3 是整数除法，并且始终为 0。它应该是

1.0/3.0