Re: c++/10902: comparing doubles is not consistent in gcc 3.3 (SuSE version)

The following reply was made to PR c++/10902; it has been noted by GNATS.

From: Jos van den Oever <[email protected]>
To: [email protected], [email protected]
Cc:  
Subject: Re: c++/10902: comparing doubles is not consistent in gcc 3.3 (SuSE version)
Date: Wed, 21 May 2003 13:34:16 +0200

 Another addition to the report.
 Comparing doubles in c does work properly:
 
 #include <stdio.h>
 #include <float.h>
 
 int
 main() {
         double one = 1.0;
         double belowone = 1.0-DBL_EPSILON;
 
         if (one == belowone) {
                 printf("one == belowone\n");
         } else {
                 printf("one != belowone\n");
         }
 
         if (1.0 == 1.0 - DBL_EPSILON) {
                 printf("1.0 == 1.0 - DBL_EPSILON\n");
         } else {
                 printf("1.0 != 1.0 - DBL_EPSILON\n");
         }
         return 0;
 }
 
 gives output:
 
 one != belowone
 1.0 != 1.0 - DBL_EPSILON