//cd c:\JavaTry\Application1
//javac Pai.java
//set CLASSPATH=.
//java Pai

class Pai {
  public static void main(String[] args) { 
    System.out.println("PAI = " + Math.PI);
  //”ΌŒar‚Μ‰~‚̖ʐΟ
  double r = 100.0;
  double area= Math.PI * r * r;
  double enshu= 2.0 * Math.PI * r;
  System.out.println("”ΌŒa100‚Μ‰~‚Μ–ΚΟ = " + area);
  System.out.println("”ΌŒa100‚Μ‰~Žό = " + enshu);
  }
}
/*
C:\JavaTry\Application1>java Pai
PAI = 3.141592653589793
”ΌŒa100‚Μ‰~‚Μ–ΚΟ = 31415.926535897932
”ΌŒa100‚Μ‰~Žό = 628.3185307179587
*/