Understanding Numeric Literals in JavaScript

JavaScript treats all numbers the same, so you don't have to do anything when working with the two basic numbers.

Integers-

These are the numbers that do not have a fraction or decimal part. So you represent an integer using a sequence of one or more digits.
Example- 0

168

2005

These are the numbers that do have a fractional or decimal part. So we represent the floating-point numbers by first writing the integer part and then writing the decimal part and at last writing the fractional part.

Example- 0.012

5.1234

-185.325974

7.1245e+32

45.321423E-654

In the above examples, the last two examples are a bit different from the others. They need some more explanation.
Exponential notation uses an (e or E) followed by a plus sign (+) or a minus sign (-) which is called an exponent.
If the notation contains a plus sign, then you have to multiply the first part of the number (the part before e or E) by 10 to the power of the exponent.
Example- 9.87654e+5

Here the exponent is 5, and 10 to the power 5 is 100,000

So multiplying 9.87654 by 100,000 we get 987,654
Example- 3.4567e-4

Here the exponent is 4, and 10 to the power 4 is 10,000
So dividing 3.4567 by 10,000 we get 0.00034567

The hexadecimal number system uses the digits from (0-9) and the letter from (A to F)
These letters represent the numbers from (10 to 15) So what is in the decimal number would be 16 is actually 10 in the hexadecimal number.
To describe the hexadecimal number in JavaScript, the number begins with (0x or x0)
Example- 0x56

x045

0xff

Understanding numeric literals (integers, floating-point numbers, exponential notations, hexadecimal integer values)