//指定位设置为1
void set_bit(char bit_array[], unsigned bit_number);

//指定位清零

void clear_bit(char bit_array[], unsigned bit_number);


//指定位清零，否则设置为1
void assign_bit(char bit_array[], unsigned bit_number， int value);

//参数指定位置为1返回真，为0返回1

int test_bit(char bit_array[], unsigned bit_number);

//字符偏移

unsigned int char_offset(unsigned bit_number)

{

	return bit_number / CHAR_BIT;

}

//bit位偏移

unsigned int bit_offset(unsigned bit_number)

{

	return bit_number % CHAR_BIT;

}

void set_bit(char bit_array[], unsigned bit_number)

{

	bit_array[char_offset(bit_number)] |= 1 << bit_offset(bit_number);

}

void clear_bit(char bit_array[], unsigned bit_number)

{

	bit_array[char_offset(bit_number)] &= ~(1 << bit_offset(bit_number));

}

void assign_bit(char bit_array[], unsigned bit_number, int value)

{

	if (value != 0) {

		set_bit(bit_array, bit_number);

	}

	else {

		clear_bit(bit_array, bit_number);

	}

}

int test_bit(char bit_array[], unsigned bit_number)

{

	//对该bit位进行与操作，如果是1则结果还是 1<< (bit_number % CHAR_BIT)

	unsigned isZero = bit_array[bit_number / CHAR_BIT] & (1 << (bit_number % CHAR_BIT));

	if (isZero == (1 << (bit_number % CHAR_BIT))) {

		return TRUE;

	}

	return FALSE;

}