Practical Coding in Java

//
// HelloMath.java
//



public class HelloMath
{
    public static void main(String[] args)
    {
        // The Math library defines common mathematical constants
        // and functions.  They are all defined as static members
        // and methods of the Math class.

        System.out.println("pi: " + Math.PI);
        System.out.println("e: " + Math.E);

        System.out.println("cos(0): " + Math.cos(0));
        System.out.println("sin(0): " + Math.sin(0));
        System.out.println("cos(pi): " + Math.cos(Math.PI));
        System.out.println("sin(pi): " + Math.sin(Math.PI));

        // Math.abs() is useful for fuzzy unit tests, which allow
        // for roundoff error in floating point calculations.
        
        double result = Math.sin(Math.PI); 
        
        if (Math.abs(result) < 1e-6)
            System.out.println("Yippee!");
        else
            System.out.println("Bummer.");
    }
}