Doing operations with very large numbers?

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    Doing operations with very large numbers?

    Is there any particular solution for handling operations with, let's say, 50 digit numbers or more, without the help of third-party libraries?

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    Guest Sebastiani's Avatar
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    Quote Originally Posted by thefeedinghand View Post
    Is there any particular solution for handling operations with, let's say, 50 digit numbers or more, without the help of third-party libraries?
    The only other option, obviously, is to write your own library.
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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    Any tips on doing that? I came up with a solution that may not work or may not be efficient, basically store the number in a char array and then convert each element of the array to a integer and pass them to a integer array and start doing the operations and work from there....

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    and the hat of wrongness Salem's Avatar
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    Do you know how to do + - * / on paper?

    Code:
     12
    +34
    =46
    If you know that, then sure it's very easy.

    It might not be particularly quick, but it will work.

    If you want efficiency, without using an existing library, then expect lots of hard work and research.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Algorithm Dissector iMalc's Avatar
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    I didn't want to use any third-party library for such a thing myself either, so I wrote my own, well two of them actually.
    They store the data as binary, one dynamically allocated, the other not.
    I'm considering writing another one that stores it as a string, also.

    Do you really want to know how to make your own? If so, you make a start, and we'll point you at a few resources on how to do the bits you aren't sure of.
    My homepage
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