//引用的注意事项
//1、引用必须初始化
//2、引用在初始化后，不可以更改

#if(0)

#include <iostream>

int main()
{
	int a = 10;
	int &b = a;  //  必须初始化 int &b; err  

	int c = 20;
	b = c;       //赋值操作，不是更改引用

	std::cout << " a = " << a << std::endl;
	std::cout << " b = " << b << std::endl;
	std::cout << " c = " << c << std::endl;

	system("pause");

	return 0;
}

#endif