Find nth Root of a number in C++ [duplicate]

Question

I'm trying to make a maths library and one of the functions finds a nth root of a float.

My current expression is -

value = value ^ 1/rootValue

but I'm getting an error because I'm using a float. Is there another method of solving this?

Answer 1

There is no "power" operator in C++; ^ is the bitwise exclusive-or operator, which is only applicable to integers.

Instead, there is a function in the standard library:

#include <cmath>

value = std::pow(value, 1.0/root);

Answer 2

^ is not what you want here. It is a bitwise exclusive-OR operator.

Use

#include <math.h>

and then

value = pow(value, 1/rootvalue)

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Reference for pow: http://www.cplusplus.com/reference/cmath/pow/