#include <bson/bson.h>

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                              BSON_DECIMAL128_T(3)

       The  bson_decimal128_t structure represents the IEEE-754 Decimal128 data type. The type bson_decimal128_t
       is an aggregate that contains two uint64_ts, named high and low. The declaration and layout order between
       them depends on the endian order of the target platform: low will always correspond to the low-order bits
       of the Decimal128 object, while high corresponds to the high-order bits. The bson_decimal128_t always has
       a size of sixteen (16), and can be bit-cast to/from a _Decimal128.

          #include <bson/bson.h>
          #include <stdio.h>

          int
          main (int argc, char *argv[])
          {
             char string[BSON_DECIMAL128_STRING];
             bson_decimal128_t decimal128;

             bson_decimal128_from_string ("100.00", &decimal128);
             bson_decimal128_to_string (&decimal128, string);
             printf ("Decimal128 value: %s\n", string);

             return 0;
          }

          #include <bson/bson.h>

          #define BSON_DECIMAL128_STRING 43
          #define BSON_DECIMAL128_INF "Infinity"
          #define BSON_DECIMAL128_NAN "NaN"

          typedef struct {
          #if BSON_BYTE_ORDER == BSON_LITTLE_ENDIAN
             uint64_t low;
             uint64_t high;
          #elif BSON_BYTE_ORDER == BSON_BIG_ENDIAN
             uint64_t high;
             uint64_t low;
          #endif
          } bson_decimal128_t;