为啥string不支持cout的<<操作?忧闷,还请高手指教!

[softworms]

string str="bobo";
cout<<str;
系统提示:
D:\myproject\enum\enum.cpp(54) : error C2678: binary '<<' : no operator defined which takes a left-hand operand of type 'class ostream_withassign' (or there is no acceptable conversion)
Error executing cl.exe.
么回事呢?

[Kudeet]

应该是cout的《不支持string类型吧

string str="bobo";
char *p = (char*)str.c_str();//转换一下类型

[dada9527]

basic_ostream& operator<<(basic_ostream& (*pf)(basic_ostream&));
basic_ostream& operator<<(basic_ios<E, T>& (*pf)(basic_ios<E, T>&));
basic_ostream& operator<<(ios_base<E, T>& (*pf)(ios_base<E, T>&));
basic_ostream& operator<<(basic_streambuf<E, T> *sb);
basic_ostream& operator<<(const char *s);
basic_ostream& operator<<(char c);
basic_ostream& operator<<(bool n);
basic_ostream& operator<<(short n);
basic_ostream& operator<<(unsigned short n);
basic_ostream& operator<<(int n);
basic_ostream& operator<<(unsigned int n);
basic_ostream& operator<<(long n);
basic_ostream& operator<<(unsigned long n);
basic_ostream& operator<<(float n);
basic_ostream& operator<<(double n);
basic_ostream& operator<<(long double n);
basic_ostream& operator<<(void * n);
//--------------------------------------------------------
怎么会不支持？？
#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
string s("hehe");
cout << s << endl;
return 0;
}

[o1n]

支持呀

#include <iostream>
#include <string>
using namespace std;
void main()
{
string s="Do you understand??";
cout << s ;

}

[alan001]

up

[Creamdog]

以下代码将可以将控制台中的一句话输入到string中

string x;
getline( cin, x );

[softworms]

怪事,我家的机器不行啊?
难道是我装的VC有问题??
但确实是有错语提示的啊.忧闷.

[Creamdog]

getline出错？

Standard C++ Library Reference

getlineSee Also
<string> Members | string::getline Sample
Extract strings from the input stream line-by-line.

template<class CharType, class Traits, class Allocator>
basic_istream<CharType, Traits>& getline(
basic_istream<CharType, Traits>& _Istr,
basic_string<CharType, Traits, Allocator>& _Str
);

template<class CharType, class Traits, class Allocator>
basic_istream<CharType, Traits>& getline(
basic_istream<CharType, Traits>& _Istr,
basic_string<CharType, Traits, Allocator>& _Str,
CharType _Delim
);
Parameter
_Istr
The input stream from which a string is to be extracted.
_Str
The string into which are read the characters from the input stream.
_Delim
The line delimiter.
Return Value
The first function returns getline( _Istr, _Str, _Istr.widen( '\n' ) ).

The second function replaces the sequence controlled by _Str with a sequence of elements extracted from the stream _Istr.

Remarks
In order of testing, extraction stops:

At end of file.
After the function extracts an element that compares equal to delim, in which case the element is neither put back nor appended to the controlled sequence.
After the function extracts str.max_size elements, in which case the function calls setstate(ios_base::failbit).
If the function extracts no elements, it calls setstate(failbit). In any case, it returns _Istr.

See Also
<string> Members | string::getline Sample



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[sohou]

你要加STL的头文件的啦
#include <iostream>
#include <string>