Cpp-learning/指针2/7、指针和函数.cpp

#include <iostream>

//利用指针作函数参数，可以修改实参的值

//实现两个数字进行交换的代码
#if(0)
void swap01(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;
}

void swap02(int* p1, int* p2)
{
	int temp = *p1;
	*p1 = *p2;
	*p2 = temp;

}

int main()
{
	//1、值传递

	int a = 10;
	int b = 20;
	swap01(a, b);


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

	//2、地址传递
	//如果地址传递可以修饰实参
	swap02(&a, &b);


	system("pause");

	return 0;
}
#endif

//总结：如果不想修改实参，就用值传递，如果想修改实参，就用地址传递。