How can I obtain the cube root in C++? -

i know how obtain square root of number using sqrt function.

how can obtain cube root of number?

sqrt stands "square root", , "square root" means raising power of 1/2. there no such thing "square root root 2", or "square root root 3". other roots, change first word; in case, seeking how perform cube rooting.

before c++11, there no specific function this, can go first principles:

• square root: std::pow(n, 1/2.) (or std::sqrt(n))
• cube root: std::pow(n, 1/3.) (or std::cbrt(n) since c++11)
• fourth root: std::pow(n, 1/4.)
• etc.

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if you're expecting pass negative values n, avoid std::pow solution — it doesn't support negative inputs fractional exponents, , why std::cbrt added:

std::cout << std::pow(-8, 1/3.) << '\n';  // output: -nan std::cout << std::cbrt(-8)      << '\n';  // output: -2 

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^{n.b. . important, because otherwise 1/3 uses integer division , results in 0.}