c语言常用的位操作

Code Snippet

1. //a=targe variable, b=bit number to act upon 0-n
2. #define BIT_SET(a,b) ((a) |= (1<<(b)))
3. #define BIT_CLEAR(a,b) ((a) &= ~(1<<(b)))
4. #define BIT_TOGGLE(a,b) ((a) ^= (1<<(b)))
5. #define BIT_CHECK(a,b) ((a) & (1<<(b)))
6.  
7. //x=targe varible, y=mask
8. #define BITMASK_SET(x,y) ((x) |= (y))
9. #define BITMASK_CLEAR(x,y) ((x) &= (~(y)))
10. #define BITMASK_TOGGLE(x,y) ((x) ^= (y))
11. #define BITMASK_CHECK(x,y) ((x) & (y))