TYPESCRIPT

find number of digits in a number

floor(log10(n) + 1);

find how many digits a number has

static int digitCountOf(int number){
            return number.ToString().Length;
        }

get number of digits in a number

function getlength(number) {
    return number.toString().length;
}

how calculate number of digits of number

let number = 152121
return number.toString().split('').length     // -> 6

// Hey, it's 6 digits!

find the number of digits of a given integer n .

#include <bits/stdc++.h>
using namespace std;
//use c++ 11
int main(){
    string n;
    cin>>n;
    int s = stoi(n);
    if(s<0) cout<<n.size()-1;
    else 
    cout<<n.size();
	return 0;
}