Integer inversion

1. The representation of signed numbers ：-2^(n-1)——2 ^(n-1)-1
2.0x and h Are used to express 16 Base number ,0x Indicates prefix , stay c/c++ Must use 0x.
3.INT_MAX and INT_MIN On behalf of int Maximum and minimum values of type
The header file is included in <limits.h> In the definition of
INT_MAX=2147483647
#define INT_MIN (-INT_MAX - 1）
The minimum value cannot be defined directly , Because it's not a number , It's an expression , Negative for maximum , Because he has overflowed , So subtract 1.
4. Ternary expression ： expression 1|| expression 2？ result 1： result 2