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

Question

I know how to obtain the square root of a number using the sqrt function.

How can I obtain the cube root of a number?

Answer 1

Actually the round must go for the above solutions to work.

The Correct solution would be

ans = round(pow(n, 1./3.));

Answer 2

The solution for this problem is

cube_root = pow(n,(float)1/3);

and you should #include <math.h> library file

Older standards of C/C++ don't support cbrt() function.

When we write code like cube_root = pow(n,1/3); the compiler thinks 1/3 = 0 (division problem in C/C++), so you need to do typecasting using (float)1/3 in order to get the correct answer

#include<iostream.h>
#include<conio.h>
#include<math.h>
using namespace std;

int main(){
float n = 64 , cube_root ;
clrscr();
cube_root = pow(n , (float)1/3);
cout<<"cube root = "<<cube_root<<endl;
getch();
return 0;
}

cube root = 4