finding cube root in C++?

Question

Strange things happen when i try to find the cube root of a number.

The following code returns me undefined. In cmd : -1.#IND

cout<

        

Answer 1

I was looking for cubit root and found this thread and it occurs to me that the following code might work:

#include 
using namespace std;

function double nth-root(double x, double n){
    if (!(n%2) || x<0){
        throw FAILEXCEPTION(); // even root from negative is fail
    }

    bool sign = (x >= 0);

    x = exp(log(abs(x))/n);

    return sign ? x : -x;
}