Cpp-learning/引用1/3、引用做函数参数.cpp

//引用做函数参数
//作用 ： 函数传参时，可以利用引用的技术让形参修饰实参
//有点 ； 可以简化指针修改实参

#if(0)

#include <iostream>

//交换函数

//1、值传递
void mySwap01(int a, int b)
{
	int temp = a;

	a = b;

	b = temp;

	std::cout << " swap01 a = " << a << std::endl;
	std::cout << " swap01 b = " << b << std::endl;

}

//2、地址传递
void mySwap02(int* a, int* b)
{
	int temp = *a;
	*a = *b;
	*b = temp;
}

//3、引用传递
void mySwap03(int& a, int& b)
{
	int temp = a;
	a = b;
	b = temp;

}


int main()
{
	int a = 10;
	int b = 20;

	//mySwap01(a, b)    值传递，形参不会修饰实参
	//mySwap01(a, b);
	
	//mySwap02(&a, &b);  //地址传递 ， 形参会修饰实参

	mySwap03(a, b);  //引用传递 ， 形参会修饰实参

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

	


	system ("pause");

	return 0;

}


//通过引用产生的效果同按地址传递是一样的。引用的语法更简单


#endif