cube root

This is a discussion on cube root within the C++ Programming forums, part of the General Programming Boards category; how do you find this? i tried this: Code: fyards = (area ^ (1/3)); //cube root but i came up ...

  1. #1
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    cube root

    how do you find this? i tried this:

    Code:
            fyards = (area ^ (1/3)); //cube root
    but i came up with this:

    63 C:\Dev-Cpp\program2.cpp invalid operands of types `float' and `int' to binary `operator^'

    help?

  2. #2
    ^ Read Backwards^
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    The power function is in the library <cmath>
    And it goes like this:
    Code:
    variable = pow(x,y);
    //Where x is what you want and y is the power
    double temp = pow(8,(1.0/3.0) ); //Will get you 2

  3. #3
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    Alternative, if area is guaranteed to be greater than zero, would be;
    Code:
       fyards = exp(log(area)/3.0);

  4. #4
    aoeuhtns
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    Quote Originally Posted by grumpy
    Alternative, if area is guaranteed to be greater than zero, would be;
    Code:
       fyards = exp(log(area)/3.0);
    This is actually what the pow function does.

  5. #5
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    Mathematically it is equivalent. As to it being what the pow() function actually does: that's implementation dependent. I suggest pow() will also do a few other things, otherwise it wouldn't work if the first argument is negative.

  6. #6
    ... arjunajay's Avatar
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    ^ is the XOR operator by the way...

  7. #7
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    Quote Originally Posted by arjunajay
    ^ is the XOR operator by the way...
    Yup.

    But the way the question was asked he was using x^y as a notation for "x raised to the power of y".

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