Cubed Root

This is a discussion on Cubed Root within the C++ Programming forums, part of the General Programming Boards category; How would you find the cubed root of a number using C++. I know how to find the square root ...

  1. #1
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    Cubed Root

    How would you find the cubed root of a number using C++. I know how to find the square root I just can't figure out how to find the cubed root.

  2. #2
    geek SilentStrike's Avatar
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    #include <cmath>

    const double ONE_THIRD = 1.0 / 3.0;

    double cuberoot(double num) {
    return pow(num, ONE_THIRD);
    }
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  3. #3
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    I made a little calculator where I used the following code to find any root... I also wrote a power function to go along with it, but that's already included in math.h I think.


    double Root(double number, double base)
    {
    double guess = 0;
    double low = 0;
    double high = number;
    double counter = 0;
    double change = 0;

    while( counter < base )
    counter++;

    if( counter != base)
    number = 0; // The point of this was to be sure it was an integer, I believe

    if (number > 0)
    {
    for( guess = (low + high)/2; Power(guess, base) != number; )
    {
    if( Power(guess, base) > number )
    high = guess;
    else
    low = guess;
    guess = (low + high)/2;
    if( high - low == change )
    break;
    change = high - low;
    }
    }
    return guess;
    }

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