iostream是什么
iostream是信息流，控制输入输出
iostream怎么用
#include<iostream>using namespace std;int a;int main(){//输入cin>>a;//输出cout<<a<<'\n';return 0;}
iostream缺失
在C:\Program Files (x86)\Dev-Cpp\MinGW64\lib\gcc\x86_64-w64-mingw32\4.9.2\include\c++添加一个叫iostream的文件（不加后缀名），用c++打开后粘贴如下代码后编译即可修复
// Standard iostream objects -*- C++ -*-// Copyright (C) 1997- Free Software Foundation, Inc.//// This file is part of the GNU ISO C++ Library. This library is free// software; you can redistribute it and/or modify it under the// terms of the GNU General Public License as published by the// Free Software Foundation; either version 3, or (at your option)// any later version.// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the// GNU General Public License for more details.// Under Section 7 of GPL version 3, you are granted additional// permissions described in the GCC Runtime Library Exception, version// 3.1, as published by the Free Software Foundation.// You should have received a copy of the GNU General Public License and// a copy of the GCC Runtime Library Exception along with this program;// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see// </licenses/>./** @file include/iostream* This is a Standard C++ Library header.*///// ISO C++ 14882: 27.3 Standard iostream objects//#ifndef _GLIBCXX_IOSTREAM#define _GLIBCXX_IOSTREAM 1#pragma GCC system_header#include <bits/c++config.h>#include <ostream>#include <istream>namespace std _GLIBCXX_VISIBILITY(default){_GLIBCXX_BEGIN_NAMESPACE_VERSION/*** @name Standard Stream Objects** The <iostream> header declares the eight <em>standard stream* objects</em>. For other declarations, see* /onlinedocs/libstdc++/manual/io.html* and the @link iosfwd I/O forward declarations @endlink** They are required by default to cooperate with the global C* library's @c FILE streams, and to be available during program* startup and termination. For more information, see the section of the* manual linked to above.*///@{extern istream cin;/// Linked to standard inputextern ostream cout;/// Linked to standard outputextern ostream cerr;/// Linked to standard error (unbuffered)extern ostream clog;/// Linked to standard error (buffered)#ifdef _GLIBCXX_USE_WCHAR_Textern wistream wcin;/// Linked to standard inputextern wostream wcout;/// Linked to standard outputextern wostream wcerr;/// Linked to standard error (unbuffered)extern wostream wclog;/// Linked to standard error (buffered)#endif//@}// For construction of filebuffers for cout, cin, cerr, clog et. al.static ios_base::Init __ioinit;_GLIBCXX_END_NAMESPACE_VERSION} // namespace#endif /* _GLIBCXX_IOSTREAM */
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