Hexadecimal Numbers

A number whose base is 16 is called a hexadecimal number. By base 16, it means we have only 16 digits to form all the numbers. They are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F.

If we follow hexadecimal number system in daily life, this is how we count 20 apples:

1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
10
11
12
13
14

Hexadecimal Literal

A hexadecimal literal starts with 0x and 0X.

0x8A
0XABC