/// Options:
// -> call the `sqrt()` function
// -> call the `powf()` function with 1/2 or 0.5
//
/// Example:
fn main() {
let x = 2f32; // or f64
let sqrt = &x.sqrt(); // call sqrt()
let sqrt2 = &x.powf(0.5); // call powf()
}
/// Note:
// The second option can also be applied to other
// roots. For the nth root it is then powf(1/n).