w3resource

JavaScript: Find the number of even digits in a given integer

JavaScript Basic: Exercise-130 with Solution

Write a JavaScript program to find the number of even digits in a given integer.

Visual Presentation:

JavaScript: Find the number of even digits in a given integer.

Sample Solution:

JavaScript Code:

// Function to count the number of even digits in a given number
function even_digits(num) {
  var ctr = 0;
  // Loop until 'num' becomes 0
  while (num) {
    // Increment 'ctr' if the last digit of 'num' is even
    ctr += num % 2 === 0;
    // Remove the last digit by integer division
    num = Math.floor(num / 10);
  }
  return ctr; // Return the count of even digits
}

// Test cases
console.log(even_digits(123)); // Output: 1
console.log(even_digits(1020)); // Output: 3
console.log(even_digits(102)); // Output: 2 

Output:

1
3
2

Live Demo:

See the Pen javascript-basic-exercise-130 by w3resource (@w3resource) on CodePen.


Flowchart:

Flowchart: JavaScript - Find the number of even digits in a given integer

ES6 Version:

// Function to count the number of even digits in a given number
const even_digits = (num) => {
  let ctr = 0;

  // Loop until 'num' becomes 0
  while (num) {
    // Increment 'ctr' if the last digit of 'num' is even
    ctr += num % 2 === 0;

    // Remove the last digit by integer division
    num = Math.floor(num / 10);
  }

  return ctr; // Return the count of even digits
};

// Test cases
console.log(even_digits(123)); // Output: 1
console.log(even_digits(1020)); // Output: 3
console.log(even_digits(102)); // Output: 2

Improve this sample solution and post your code through Disqus.

Previous: JavaScript program to find the smallest prime number strictly greater than a given number.
Next: JavaScript program to create an array of prefix sums of the given array.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://www.w3resource.com/javascript-exercises/javascript-basic-exercise-130.php