C++中cout/cin对于空指针、字符指针的处理，及输入>>、 输出<<操作符的重载

本文链接：http://blog.youkuaiyun.com/ncepuwanghui/article/details/23712735

#include <iostream>
using namespace std;


void func(char* p)
{
	p = new char[128];
	//*p = "Hello World";//错误写法：invalid conversion from ‘const char*’ to ‘char’
	p = "Hello World";//有警告：将一个字符串常量转换为char*时存在风险,应使用常量指针
	cout << "&p = " << &p << endl;
	cout << "p = " << (void*)p << endl;
	cout << "*p = " << *p << endl;
	cout << "p = " << p  << endl;
}


int main(int argc, char const *argv[])
{
	char *ptr = NULL;
	//char *ptr = 0;
	cout << "-------------------------------------------------" << endl;
	cout << "&ptr = " <