Find Number of Digits in Number

Count the number of digits in a long integer entered by a user.

Right off the bat, we know we’re going to have to iterate over the number to count the number of digits. So let’s start by setting a variable, and then initializing a while loop. We can only count the digits when the test expression is not equal to zero.

function countDigit(n) {
    let count = 0;
    while (n != 0)
}

Within the while loop, we’ll use a handy JavaScript function that will make things easier for us. Math.floor returns the largest integer less than or equal to a given number.

function countDigit(n) {
    let count = 0;
    while (n != 0)
       {
       n = Math.floor(n / 10);
       }
}

We will increase our count variable through each iteration, until n equals 0, which is how we break out the loop.

function countDigit(n) {
    let count = 0;
    while (n != 0)
     {
        n = Math.floor(n / 10);
        ++count;
     }
 return count;
}

Lastly, return the count. Happy coding!