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:  * Operator x - y produces the same result as x + (-y)
michael@0:  *
michael@0:  * @path ch11/11.6/11.6.2/S11.6.2_A4_T5.js
michael@0:  * @description Using the rule of sum of two zeroes and the fact that a - b = a + (-b)
michael@0:  */
michael@0: 
michael@0: //CHECK#1
michael@0: if (-0 - -0 !== 0 ) {  
michael@0:   $ERROR('#1.1: -0 - -0 === 0. Actual: ' + (-0 - -0));
michael@0: } else {
michael@0:   if (1 / (-0 - -0) !== Number.POSITIVE_INFINITY) {
michael@0:     $ERROR('#1.2: -0 - -0 === + 0. Actual: -0');
michael@0:   }
michael@0: }
michael@0: 
michael@0: //CHECK#2
michael@0: if (0 - -0 !== 0 ) {  
michael@0:   $ERROR('#2.1: 0 - -0 === 0. Actual: ' + (0 - -0));
michael@0: } else {
michael@0:   if (1 / (0 - -0) !== Number.POSITIVE_INFINITY) {
michael@0:     $ERROR('#2.2: 0 - -0 === + 0. Actual: -0');
michael@0:   }
michael@0: }
michael@0: 
michael@0: //CHECK#3
michael@0: if (-0 - 0 !== -0 ) {  
michael@0:   $ERROR('#3.1: -0 - 0 === 0. Actual: ' + (-0 - 0));
michael@0: } else {
michael@0:   if (1 / (-0 - 0) !== Number.NEGATIVE_INFINITY) {
michael@0:     $ERROR('#3.2: -0 - 0 === - 0. Actual: +0');
michael@0:   }
michael@0: }
michael@0: 
michael@0: //CHECK#4
michael@0: if (0 - 0 !== 0 ) {  
michael@0:   $ERROR('#4.1: 0 - 0 === 0. Actual: ' + (0 - 0));
michael@0: } else {
michael@0:   if (1 / (0 - 0) !== Number.POSITIVE_INFINITY) {
michael@0:     $ERROR('#4.2: 0 - 0 === + 0. Actual: -0');
michael@0:   }
michael@0: }
michael@0: