pi.java

public class pi {
    public static void main(String[] args) {
        int n = 30000000;
        int mc = 0;
        for (int i = 0; i < n; i++) {
            double x = Math.random();
            double y = Math.random();
            mc += (x*x + y*y < 1 )? 1 : 0;
        }
        double pi = (double)4*mc/n;
        System.out.println("pi="+pi);
    }
}