# Finding special type of numbers - JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

In the decimal number system, all the real numbers can be divided into two groups −

• Rational Numbers
• Irrational Numbers

For the scope of this problem we will only discuss the rational numbers,

All those numbers which can be written in the p/q (where q !== 0) form are called rational numbers.

Like 14, 4.6, 3.33333... and many more

The rational numbers, further can be divided into two groups −

• Terminating decimal numbers
• Repeating decimal numbers

This categorization is made on the basis of result obtained upon dividing p by q.

The thumb for this categorization is that −

• We will obtain a terminating decimal number if and only if the prime factors of q are only 2 and 5
• We will obtain a repeating decimal number of the prime factors of q includes any other number than 2 or 5.

So, we are required to write a JavaScript function that takes in a number that represents the value q. Our function should return true if for that value of we can obtain a terminating decimal number, false otherwise.

## Example

Following is the code −

const num = 1250;
const isTerminating = num => {
while(num !== 1){
if(num % 2 === 0){
num /= 2;
}else if(num % 5 === 0){
num /= 5;
}else{
return false;
};
};
return true;
};
console.log(isTerminating(num));

## Output

This will produce the following output in console −

true
Published on 30-Sep-2020 13:49:05