/ This is a test of BigDecimal to calculate pi (eventually).
import java.math.*;
public class Bigtest{
public static void main(String[] args){
int z = 1;
BigDecimal k = new BigDecimal(Integer.toString(z));
// Section 1: (1 / Math.pow(16,k))
double x = 16;
BigDecimal sixteen = new BigDecimal(Double.toString(x));
BigDecimal sixteen2 = new BigDecimal(Double.toString(x));
for(int i=1;i<5;i++){
sixteen = sixteen.multiply(sixteen2);
}
BigDecimal one = new BigDecimal("1");
BigDecimal section1 = new BigDecimal(one.toPlainString());
section1 = section1.divide(sixteen);
System.out.println(section1.toPlainString());
// Section 2
BigDecimal eight = new BigDecimal("8");
BigDecimal four = new BigDecimal("4");
BigDecimal six = new BigDecimal("6");
BigDecimal five = new BigDecimal("5");
// Section 2a (4/(8*k + 1))
BigDecimal sec2abottom = new BigDecimal(eight.toPlainString());
sec2abottom = sec2abottom.multiply(k);
sec2abottom = sec2abottom.add(one);
BigDecimal sec2a = new BigDecimal("4");
sec2a = sec2a.divide(sec2abottom); // This returns an inexact value, i.e. 4/9
System.out.println(sec2abottom.toPlainString()); // How do I round it to n decimal places?
}
}