(
(n>>21)&0x80 \
(n>>18)&0x40 \
(n>>15)&0x20 \
(n>>12)&0x10 \
(n>>9)&0x08 \
(n>>6)&0x04 \
(n>>3)&0x02 \
(n>>0)&0x01 \
)
#define Bin(n) (0x##n##L)
1. The function of \ is to make the content of the next line continue the unfinished content of the previous line
2. ## is used as a connection character. For example: 0x##11110000##L is replaced by 0x11110000. Convert 8 decimal numbers to hexadecimal. L represents a long integer of 32 bits.
3. flying a;
a=Bin(10101010);// a=0xaa
That is, bit operations can be implemented. Some compilers do not support direct binary operations, such as 0B10101010
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