How do I use sqrt() and pow() math functions?

Question

I tried starting with import java.lang.Math.*; and using sqrt() and pow(), but I get an error response in compilation.
//** 1/pi calculation program using Ramanujan's forumula **//
//** by n=2 iteration, double precision value for 1/pi repeats **//
import java.lang.Math.*;
import java.io.*;
public class CalcInversePiRamanujan {
  public static void main(String args[]) {
    double n=0, term, four_n_factorial=1, n_factorial=1, inverse_pi=0;
    inverse_pi = four_n_factorial * 1103 * 2 * sqrt(2) / 9801; //** initial value for n=0 **//
    System.out.println(inverse_pi);
    for (n=1, four_n_factorial=1, n_factorial=1; n<=3; n++) {
        four_n_factorial *= (4 * n);
        four_n_factorial *= (4*n-1);
        four_n_factorial *= (4*n-2);
        four_n_factorial *= (4*n-3);
        term = four_n_factorial;
        n_factorial *= n;
        term /= pow(n_factorial, 4);
        term *= 1103 + 26390 * n;
        term /= pow(396, 4 * n);
        term *= 2 * sqrt(2);
        term /= 9801;
        inverse_pi += term;
        System.out.println(n, term, inverse_pi);
    System.exit(0);
}

Answer 1

all methods in math class are static so you have to call them as
Math.pow() and Math.sqrt() you dont have to import any additional packages as Math is a class available in java.lang package
you have to change your
System.out.println(n, term, inverse_pi); to
System.out.println(n+ term+ inverse_pi);
math class also provides the value of Pi you can access it using Math.PI