Question

how to write x = 1/2(xn +5/xn) in java

Answer 1

I'm not really sure about that expression, do you mind clarifying it a bit?

However, here's my interpretation:

class TestClass
{
public static void main (String[] args)
{
/* Interpretation of: x = (x1*n1 + 5/(x1*n1))/2; */

int x1 = 2, // Some test-values
n1 = 2;

x1 = (x1*n1 + 5/(x1*n1))/2;

System.out.println("X as an integear: "+ x1);

double x2 = 2, // Some test-values
n2 = 2;

x2 = (x2*n2 + 5.0/(x2*n2))/2.0;

System.out.println("X as a double: "+ x2);
}
}

Runnable example:
https://ideone.com/Sb2Lkl

Answer 2

I would just suggest using more parenthesis.