JavaScript: Count the digits of an integer

JavaScript Math: Exercise-41 with Solution

Count Integer Digits

Write a JavaScript function to count integer digits.

Sample Solution:

JavaScript Code:

// Define a function named digits_count that counts the number of digits in a given number.
function digits_count(n) {
  // Initialize a variable to store the count of digits.
  var count = 0;
  // Check if the number is greater than or equal to 1, and if so, increment the count.
  if (n >= 1) ++count;

  // Repeat the following steps while the number divided by 10 is greater than or equal to 1.
  while (n / 10 >= 1) {
    // Divide the number by 10 to remove one digit.
    n /= 10;
    // Increment the count to keep track of the number of digits removed.
    ++count;
  }

  // Return the final count of digits.
  return count;
}

// Output the result of counting the digits in the number 12112 to the console.
console.log(digits_count(12112));

// Output the result of counting the digits in the number 457 to the console.
console.log(digits_count(457));

Output:

5
3

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-41 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that counts the number of digits in an integer by converting it to a string.
• Write a JavaScript function that uses iterative division to count the digits in an integer without string conversion.
• Write a JavaScript function that handles negative numbers by taking the absolute value before counting digits.
• Write a JavaScript function that calculates the number of digits using a while loop and division by 10.

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