Octal literals begin with zero and only digits 0 through 7 are allowed. For instance:
011
Hexadecimal literals begin with 0x or oX, the digits allowed are 0 through 9 and a through f (or A through F). For instance:
0x0001;
All integer literals are of type int by default. To define them as long, we can place a suffix of L or l after the number.
For char literals, a single character is enclosed in single quotes. You can also use the prefix \u followed by four hexadecimal digits
