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 // Copyright 2009 the Sputnik authors.  All rights reserved.

 // This code is governed by the BSD license found in the LICENSE file.

 /**

  * The production ReturnStatement : return Expression; is evaluated as:

  * i)   Evaluate Expression.

  * ii)  Call GetValue(Result(2)).

  * iii) Return (return, Result(3), empty)

  *

  * @path ch12/12.9/S12.9_A4.js

  * @description Return very sophisticated expression and function

  */

 // second derivative 

 function DD_operator(f, delta){return function(x){return (f(x+delta)-2*f(x)+f(x-delta))/(delta*delta)};}

 DDsin = DD_operator(Math.sin, 0.00001);

 //////////////////////////////////////////////////////////////////////////////

 //CHECK#1

 // ((sin(x))')' = -sin(x)

 if (DDsin( Math.PI/2 ) + Math.sin( Math.PI/2 ) > 0.00001) {

 	$ERROR('#1: return Expression yields to Return (return, GetValue(Evaluate Expression), empty)');

 }

 //

 //////////////////////////////////////////////////////////////////////////////