what symbol is used in c++ to represent square(e.g the square of 3 is 9) and cube?

Answer 1

There is no square or cube operator in C++. You have to use pow from math.h.

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

int main(void) {
cout << pow(42.0, 2.0) << endl; //square
cout << pow(42.0, 3.0); //cube
return 0;
}

Answer 2

and what is for suare root?

Answer 3

sqrt() function