求大家指教啊error C2679: binary '<<' : no operator defined which 。。。

[a2175919]

#include <iostream>
using namespace std;
struct Person{
string name;
bool gender;
int age;
Person* lover;
Person(string n,bool g){
lover=NULL;
age=0;
}
void show()
{
cout<<"大家好，我是超级"<<(gender?"帅哥":"美女")<<name<<"今年"<<age<<",";

if(lover==NULL)
cout<<"未婚";
else
cout<<"我的爱人是"<<lover->name;
cout<<"，很高兴认识大家!"<<endl;
}
};
int main()
{
Person a("大大",false),b("开开",true);

a.show();
b.show();
system("pause");
return 0;
}

程序如上
错误信息为
--------------------Configuration: 0412amb - Win32 Debug--------------------
Compiling...
0412amb.cpp
D:\test\0412amb.cpp(14) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversion)
D:\test\0412amb.cpp(19) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversion)
Error executing cl.exe.

0412amb.exe - 2 error(s), 0 warning(s)

[taodm]

#include <string>

[a2175919]

[Quote=引用 1 楼 的回复:]
#include <string>
[/Quote]
嗯 谢谢啊 可以了

[南京搬运工]

我也碰到了ASSERT_VALID(this);

CDrawObj::Serialize(ar);

if (ar.IsStoring())
{
ar << m_extent;
ar << m_pClientItem;
}
else