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e can be calculated relatively easy.

It is defined like this:

e &= \sum_{k=0}^{\infty} \frac{1}{k!}

Which is the same as this:

e &= \frac{1}{0!} + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} \cdot \cdot \cdot

And even further:

e &= 1 + \frac{1}{1} + \frac{1}{1 \cdot 2} + \frac{1}{1 \cdot 2 \cdot 3} + \frac{1}{1 \cdot 2 \cdot 3 \cdot 4} \cdot \cdot \cdot

That formula can be implemented in a pretty straight forward algorithm.


The goal here is not to create code that produces correct results!

If you want to know some exact value, you can look it up [1]:

e &= 2.718281828459045235360287471352662497757247093699959574966967


The goal is to cross-compare the languages in terms of efficiency and speed.

This algorithm does enough work to produce comparable results and is simple enough to avoid bugs from sneaking in.

More languages may be following soon..

In any version, per default k &= 100 is chosen, the first parameter on the command line replaces k with given number.


A simple make or make all will build all files.

To run (and build it before if necessary) the project in one specific language try make c, make java or make py.

Or make run to run (and build before if necessary) all languages.

Use make clean to delete all compiled files.

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