This is the Windows app named ExactCalc whose latest release can be downloaded as XRSSfeedforfil. It can be run online in the free hosting provider OnWorks for workstations.

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ExactCalc

## DESCRIPTION

1/3 is not 0.33. Pi is not 3.14. Actually 1/3 is in interval [0.33, 0.34] and pi is in interval [3.14, 3.15].

During computation truncating error is accumulating. At end of computation it is needed to know real boundaries of result. The solution is given by interval arithmetic. Simply speaking, because 1/3 is in interval [0.33, 0.34] and 1/7 is in interval [0.14, 0.15], value 1/3 - 1/7 must be in [0.18, 0.2]. Computation can be arbitrary long and complex but interval arithmetic gives interval that contains exact result of computation.

Sometimes is more easy to use numerical unstable algorithm to solve problem. Instability is actually speed of accumulating the truncation error, but it can be decreased arbitrary by using more precise computation. Interval arithmetic provides us control of accumulating truncating error.

To save Your time using CPU time this program provides interpreter of simple programming language based on interval algebra with arbitrary precision arithmetic.

#### Audience

Science/Research, Education, Engineering

Qt

C++

#### Categories

Mathematics, Education

This is an application that can also be fetched from https://sourceforge.net/projects/exactcalc/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.

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