Getting the value for e or for pi

Both E (the base of the natural logarithms) and PI
(the ratio of the circumference of a circle to its diameter)
are defined in the Math class as static member variables of type double.
e = 2.7182818284590452354
pi = 3.14159265358979323846

System.out.println(Math.E);    // 2.718281828459045
System.out.println(Math.PI);   // 3.141592653589793