Use of C++ float/double in financial applications such as that in stock exchanges and/or brokerage houses

Use of C++ float/double in financial applications such as that in stock exchanges and/or brokerage houses. Is the rounding gap resulting from using float in C++ considered immaterial/acceptable? Is it a normal practice? What about using a customized fixed-point class to do such math? What are your opinions? Thanks a lot in advance. — Be …

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