별칭선언(using)

1. typedef [기존자료형] [별칭]

예) typedef double salary;

2. using [별칭] = [기존자료형]  (c++11 표준)

예) using salary = double;

int main()
{
	using salary = double;
	using point = int;

	salary bbangwon = 125.20;
	point peter = 100.12;

	return 0;
}