#define FLAG_A		(1 << 0)
#define FLAG_B		(1 << 1)
#define FLAG_C		(1 << 2)

int funcA(void)
{
	return 0;
}

int funcB(void)
{
	return 0;
}

int funcC(void)
{
	return 0;
}

int execute(unsigned char flg)
{
	if (flg & FLAG_A)
	{
		funcA();
	}
	if (flg & FLAG_B)
	{
		funcB();
	}
	if (flg & FLAG_C)
	{
		funcC();
	}

	return 0;
}

int main(void)
{
	unsigned char flg = 0;

	flg |= FLAG_A;
	//flg |= FLAG_B;
	flg |= FLAG_C;
	execute(flg);

	return 0;
}