C++ 字符串的简单使用，从C++；

嗯

自从我写过C++以来，已经有一段时间了。 我生锈了

那么我做错了什么，为什么

#include <iostream>

std::string hello() {
  return "another green world";
}

int main(int argc, char **argv) {
  std::cout << hello() << std::endl;    
  return 0;
}

给我

/tmp/ccxCCo47.o: In function `hello[abi:cxx11]()':
test.cpp:(.text+0x34): undefined reference to `std::allocator<char>::allocator()'
test.cpp:(.text+0x4b): undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'
test.cpp:(.text+0x57): undefined reference to `std::allocator<char>::~allocator()'
test.cpp:(.text+0x7b): undefined reference to `std::allocator<char>::~allocator()'
/tmp/ccxCCo47.o: In function `main':
test.cpp:(.text+0xcb): undefined reference to `std::cout'
test.cpp:(.text+0xd0): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
test.cpp:(.text+0xda): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
test.cpp:(.text+0xe5): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))'
test.cpp:(.text+0xf1): undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
test.cpp:(.text+0x116): undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/tmp/ccxCCo47.o: In function `__static_initialization_and_destruction_0(int, int)':
test.cpp:(.text+0x156): undefined reference to `std::ios_base::Init::Init()'
test.cpp:(.text+0x16b): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccxCCo47.o:(.data.rel.local.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0): undefined reference to `__gxx_personality_v0'
collect2: error: ld returned 1 exit status

/tmp/ccxCCo47.o:在函数“hello[abi:cxx11]（）”中：
test.cpp:（.text+0x34）：对“std:：allocator:：allocator（）”的未定义引用
test.cpp:（.text+0x4b）：对“std:：\uuucx11:：basic\u string:：basic\u string（char const*，std:：allocator const&）”的未定义引用
test.cpp:（.text+0x57）：对“std:：allocator:：~allocator（）”的未定义引用
test.cpp:（.text+0x7b）：对“std:：allocator:：~allocator（）”的未定义引用
/tmp/ccxCCo47.o:在函数“main”中：
test.cpp:（.text+0xcb）：对“std:：cout”的未定义引用
test.cpp:（.text+0xd0）：对“std:：basic\u ostream&std:：operator”的未定义引用您需要包含头文件

#include <iostream>

如何编译你的代码？用ITS<代码> G+++ <代码>更新问题，而不是<代码> GCC  >编译C++代码>code>g++test.cpp-o test

。您使用哪种编译器？因为它似乎是用ideone工作的。我真的在这样做。我只是忘了把它包括在上面。试着用g++编译吗？g++test.cpp有什么区别？如果使用g++，默认情况下将链接libstdc++。通过@星际GCC是C编译器，用G++编译C++。他们不是同一种语言。

#include <iostream>

g++ test.cpp