w3resource

JavaScript: Find out if a number is a natural number or not

JavaScript Math: Exercise-12 with Solution

Write a JavaScript function to find out if a number is a natural number or not.

Note:
Natural numbers are whole numbers from 1 upwards : 1, 2, 3, and so on ... or from 0 upwards in some area of mathematics: 0, 1, 2, 3 and so on ...
No negative numbers and no fractions.
Test Data:
console.log(is_Natural(-15));
console.log(is_Natural(1));
console.log(is_Natural(10.22));
console.log(is_Natural(10/0));
Output:
false
true
false
false

Pictorial Presentation:

JavaScript: Math - Find out if a number is a natural number or not

Sample Solution:-

HTML Code:

<!DOCTYPE html>
  <html>
  <head>
  <meta charset="utf-8">
  <title>Checking for Natural Number</title>
  </head>
  <body>
</body>
  </html>
  

JavaScript Code:

function is_Natural(n) 
      {
	   if (typeof n !== 'number') 
	        return 'Not a number'; 
			
	 return (n >= 0.0) && (Math.floor(n) === n) && n !== Infinity;
	    }
console.log(is_Natural(-15));
console.log(is_Natural(1));
console.log(is_Natural(10.22)); console.log(is_Natural(10/0));

Sample Output:

false
true
false
false

Flowchart:

Flowchart: JavaScript Math- Find out if a number is a natural  or not

Live Demo:

See the Pen javascript-math-exercise-12 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to get the least common multiple (LCM) of more than 2 integers.
Next: Write a JavaScript function to test if a number is a power of 2.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.