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decimal64 fits well to replace binary64 format in applications where 'small deviations' are unwanted and speed isn't extremely crucial. In contrast to the binaryxxx data formats the decimalxxx formats provide exact representation of decimal fractions, exact calculations with them and enable human common 'ties away from zero' rounding (in some range, to some precision, to some degree).
C++ also supports malloc and free, from C, but these are not compatible with new and delete. Use of new returns an address to the allocated memory. The C++ Core Guidelines advise against using new directly for creating dynamic objects in favor of smart pointers through make_unique < T > for single ownership and make_shared < T > for reference ...
[24] [25] In the British pre-decimal currency system, the term £sd (or Lsd) for pounds, shillings and pence referred to the Roman libra, solidus, and denarius. [ 15 ] Notable style guides recommend that the pound sign be used without any abbreviation or qualification to indicate sterling (e.g., £12,000).