#include <iostream>
void say_hello()
{
std::cout << "hello world !" << std::endl;
}
class Hello
{
public:
void operator () ()
{
std::cout << "hello cpp !" << std::endl;
}//重载运算符();
};
int main()
{
say_hello();
Hello p;
p();
std::cin.get();
return 0;
}