michael@0: // Copyright 2009 the Sputnik authors.  All rights reserved.
michael@0: // This code is governed by the BSD license found in the LICENSE file.
michael@0: 
michael@0: /**
michael@0:  * The production ReturnStatement : return Expression; is evaluated as:
michael@0:  * i)   Evaluate Expression.
michael@0:  * ii)  Call GetValue(Result(2)).
michael@0:  * iii) Return (return, Result(3), empty)
michael@0:  *
michael@0:  * @path ch12/12.9/S12.9_A4.js
michael@0:  * @description Return very sophisticated expression and function
michael@0:  */
michael@0: 
michael@0: // second derivative 
michael@0: function DD_operator(f, delta){return function(x){return (f(x+delta)-2*f(x)+f(x-delta))/(delta*delta)};}
michael@0: 
michael@0: DDsin = DD_operator(Math.sin, 0.00001);
michael@0: 
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: //CHECK#1
michael@0: // ((sin(x))')' = -sin(x)
michael@0: if (DDsin( Math.PI/2 ) + Math.sin( Math.PI/2 ) > 0.00001) {
michael@0: 	$ERROR('#1: return Expression yields to Return (return, GetValue(Evaluate Expression), empty)');
michael@0: }
michael@0: //
michael@0: //////////////////////////////////////////////////////////////////////////////
michael@0: