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  1. C Driver
  2. CDRIVER-3938

Rounding errors in double type in bson_as_relaxed_extended_json() function

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    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 1.17.4
    • Component/s: libbson
    • None

      The bson_as_relaxed_extended_json() is not showing correctly doubles. In particular, if I had:

       

      doc = bson_new ();
bson_oid_init (&oid, NULL);
BSON_APPEND_OID (doc, "_id", &oid);
BSON_APPEND_DOUBLE (doc, "d1", -3.691944);
BSON_APPEND_DOUBLE (doc, "d2", 40.418889);
char* bsonStr = bson_as_relaxed_extended_json(doc, NULL);
fprintf(stdout, "%s\n", bsonStr);
bson_t *opt = BCON_NEW("validate", BCON_BOOL(false));
if (!mongoc_collection_insert_one (
  collection, doc, opt, NULL, &error)) {
  fprintf (stderr, "ERROR: %s\n", error.message);
}

       

      (I have included only the relevant part of my program for the sake of briefness, but of course, the full code is available if you need it) 

      What I see in my output is:

       

      { "_id" : { "$oid" : "605deb4b0547463a2521fcd2" }, "d1" : -3.6919439999999998925, "d2" : 40.418889000000000067 }

      instead of (i.e. my expectation):

      { "_id" : { "$oid" : "605deb4b0547463a2521fcd2" }, "d1" : -3.691944, "d2" : 40.418889 }

      However, in the DB the data is inserted correctly:

       

      > db.mycoll.find()
{ "_id" : ObjectId("605dea3e23a3171905115392"), "d1" : -3.691944, "d2" : 40.418889 }

      Not sure if other functions that also render JSON strings have the same problem. I have checked only bson_as_relaxed_extended_json().

      Maybe I'm doing something wrong?

      Thanks!

            Assignee:
            roberto.sanchez@mongodb.com Roberto Sanchez
            Reporter:
            fermin.galanmarquez@telefonica.com Fermín Galán
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              Created:
              Updated:
              Resolved: