How to raise decimal to floating point power?

Question

JavaScript

Given the number 1.000001, when raised to a power of 2**19, we get result: 1.6892552271606103 There is a custom function that does the same thing, but a different result comes out.
1.000001**2**19

function costumePow(num, pow) {
    for(let i = 0; i < pow; i++)
    {
        num *= num;
    }
    return num;
}

result: 1.689255227180379 The

question is how to rewrite the function so that the answers match.

Answer 1

You messed something up.
1.000001**2**19 also returns 1.689255227180379. Just checked in console.

> costumePow(1.000001, 19)
1.689255227180379
> 1.000001**2**19
1.689255227180379

Answer 2

Find one difference is called