Approaching PI by Monte-Carlo simulation - Java Language Basics

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Description

Approaching PI by Monte-Carlo simulation

Demo Code

public class Main {
  public static void main(String[] args) {
    int iter = 10000000; // # iterations
    int hits = 0;
    for (int i = 0; i < iter; i++) {
      double rX = 2 * Math.random() - 1.0;
      double rY = 2 * Math.random() - 1.0;
      double dist = rX * rX + rY * rY;
      if (dist <= 1.0) // falls inside the disk
        hits++;/*from   ww  w. j a  v a 2 s. c  o m*/
    }
    double ratio = (double) hits / iter; // Ratio of areas
    double area = ratio * 4.0;
    System.out.println("Estimation of PI: " + area + " versuslibrary PI "
        + Math.PI);
  }
}

Result


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