c++ 函数返回指针 及用法

#include<string>
#include<iostream>

using namespace std;

string fun1(int a)
{

string str = "a";
return str;
}

char* fun2(int a)
{
char *p = new char[];
p[] = 'a';
p[] = '\0';
return p;
}

void main()
{

cout<<fun1()<<endl;

char *p = fun2();
cout<<p<<endl;
delete [] p;
}