Integer literal syntax 1 decimal_constant 1 octal_constant 1 hexadecimal_constant 2? 2.0 l 2.0 L 2.0 ll 2.0 LL 2.1? 2.1 u 2.1 U 2.0 u 2.0 U 2.1? 2.1 l 2.1 L 2.1 ll 2.1 LL