SCIENTIA SINICA Informationis, Volume 46, Issue 6: 698-713(2016) https://doi.org/10.1360/N112015-00061

A reliable computing algorithm and its software application ISReal for arithmetic expressions

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  • ReceivedJul 22, 2015
  • AcceptedOct 15, 2015
  • PublishedMay 27, 2016


Precise evaluation of arithmetic expressions is fundamental for ensuring the accuracy of various complicated calculations. However, in most mainstream software, incorrect rounding computation error and machine error lead to results instability. To address the problem of unstable computation, this paper proposes an automated adaptive technique for determining the correct degree of precision in the intermediate steps of a calculation, thereby an algorithm is presented for performing the reliable calculation of arithmetic expressions. In addition, we implement a software application, ISReal, using C++. Using this method, an arithmetic expression can be evaluated with any required degree of precision, regardless of whether the expression is well-conditioned or ill-conditioned, and the calculated value will always be consistent with the theoretical result.

Funded by



国家自然科学基金(614025 37)




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