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;
}