例如文中的代码
#define BITWORD 8
#define SHIFT 3
#define N 32
#define Mask 0x7
void set_bit(uint8_t* array, uint8_t num);
void clear_bit(uint8_t* array, uint8_t num);
bool test_bit(uint8_t* array, uint8_t num);
uint8_t test_array[N / BITWORD + 1] = { 0 };
int main()
{
set_bit(test_array, 22);
printf("%d\n", test_bit(test_array, 22));
}
void set_bit(uint8_t* array, uint8_t num)
{
array[num >> SHIFT] |= (1 << (num & Mask));
}
void clear_bit(uint8_t* array, uint8_t num)
{
array[num >> SHIFT] &= ~(1 << (num & Mask));
}
bool test_bit(uint8_t* array, uint8_t num)
{
return array[num >> SHIFT] & (1 << (num & Mask));
}
