Can someone explain this part of code to me?

March 18, 2022

What does exp=floor(log10(static_cast<double>(n))); mean?

I got the algorithm on internet but I dont get what this part means.

int spatiu (int n)
{
    int exp = floor(log10(static_cast<double>(n)));
    int div;
    while (n != 0)
    {
        div = pow(10.0, exp);
        cout << n / div << " ";
        n %= div;
        exp--;
    }
    cout << endl;
}

>Solution :

here

floor(log10(static_cast<double>(n)));

floor() function is used to take value in round off example 12.6 means floor value is 11.

static_cast<double>(n) is used here to "n" typecast in double. and log10() is used to take log10(n) of a number.

summary is floor(log10(static_cast<double>(n))); is used to calculate the length of number-1; for example n= 153, then function return 2 as a output.