'cout'不是'std'& 'cout'未在此范围中声明 [英] ‘cout’ is not a member of ‘std’ & ‘cout’ was not declared in this scope

问题描述

我意识到有几个这样的重复，但没有一个为我工作到目前为止。
我试图在Ubuntu上使用g ++编译一个C ++非常简单的程序，但它给我的范围错误。

  #include< iostream> 
 using namespace std; 
 
 int main（）
 {
 cout< 你好，世界; 
} 
  

这会给我这个错误： >

  sudo g ++ -v test.c 
 test.c：在函数'int main（）'：
 test .c：7：3：错误：'cout'未在此范围内声明
  

定义范围许多其他帖子说，但是也没有工作，但给了我一个不同的错误：

  #include < iostream> 
 
 int main（）
 {
 std :: cout< 你好，世界; 
} 
  

产生错误：
$ b

  test.c：在函数'int main（）'：
 test.c：6：3：error：'cout'is not std的成员
  

大多数在线建议建议using namespace std; include和std :: cout。
所以我试过所有3在一起，仍然没有运气：（

  #include< iostream> 
 using namespace std; 
 
 int main（）
 {
 std :: cout<<Hello world; 
} 
  

会出现错误：

  test.c：在函数'int main（）'：
 test.c：7：3：error：'cout'不是'std'的成员
  





---

我已经经历了几个论坛在线，但没有一个似乎为我工作（

这是更大问题的一部分，因为我的一个linux make不起作用。

Btw，我使用g ++而不是gcc作为一些帖子。

---

编辑1： p>

我将名称更改为.cpp，并且不使用sudo执行此处是详细输出：

  pranoy @ pranoyubuntu1210：〜/ Desktop / SIP / SIPp / sipp-3.3 $ g ++ -v test.cpp -o test 
使用内建规格
 COLLECT_GCC = g ++ 
 COLLECT_LTO_WRAPPER = / usr / lib / gcc / x86_64-linux-gnu / 4.7 / lto-wrapper 
目标：x86_64-linux-gnu 
配置为：../src/configure -v  - with-pkgversion ='Ubuntu / Linaro 4.7.2-2ubuntu1'--with-bugurl = file：///usr/share/doc/gcc-4.7/README.Bugs --enable-languages = c，c ++，go， fortran，objc，obj-c ++ --prefix = / usr --program-suffix = -4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir = / usr / lib --without-included-gettext --enable-threads = posix --with-gxx-include-dir = / usr / include / c ++ / 4.7 --libdir = / usr / lib --enable-nls --with-sysroot = / --enable-clocale = gnu --enable-libstdcxx-debug --enable-libstdcxx-time = yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable- werror --with-arch-32 = i686 --with-tune = generic --enable-checking = release --build = x86_64-linux-gnu --host = x86_64-linux-gnu --target = x86_64-linux- gnu 
线程模型：posix 
 gcc版本4.7.2（Ubuntu / Linaro 4.7.2-2ubuntu1）
 COLLECT_GCC_OPTIONS =' -  v''-o''test''-shared-libgcc ''-mtune = generic''-march = x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1plus -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE测试。 cpp -quiet -dumpbase test.cpp -mtune = generic -march = x86-64 -auxbase test -version -fstack-protector -o /tmp/cczzibvL.s 
 GNU C ++（Ubuntu / Linaro 4.7.2-2ubuntu1 ）由GNU C版本4.7.2，GMP版本5.0.2，MPFR版本3.1.0-p3，MPC版本0.9编译的版本4.7.2（x86_64-linux-gnu）
 
 GGC启发式： -param ggc-min-expand = 100 --param ggc-min-heapsize = 131072 
忽略不存在的目录/ usr / local / include / x86_64-linux-gnu
忽略不存在的目录/ usr /lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include
 #include...搜索从这里开始：
 #include< ...>搜索从这里开始：
 /usr/include/c++/4.7 
 /usr/include/c++/4.7/x86_64-linux-gnu 
 /usr/include/c++/4.7/backward 
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include 
 / usr / local / include 
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed 
 / usr / include / x86_64-linux-gnu 
 / usr / include 
搜索列表的结尾。 
 GNU C版本4.7.2，GMP版本5.0.2，MPFR版本3.1编译的GNU C ++（Ubuntu / Linaro 4.7.2-2ubuntu1）版本4.7.2（x86_64-linux-gnu）
。 0-p3，MPC version 0.9 
 GGC启发式：--param ggc-min-expand = 100 --param ggc-min-heapsize = 131072 
编译器可执行的校验和：521527ea42f0901bf839bcaad0cb13e6 
 test.cpp ：在函数'int main（）'：
 test.cpp：5：3：error：'cout'不是'std'的成员
   $ b> $ p> 
 
解决方案
 
 $ b 
听起来你没有为C ++环境安装所有必要的文件，或者有些东西不太对。尝试此操作：
  $ sudo apt-get remove g ++ libstdc ++  -  6.4.7-dev 
 $ sudo apt-get安装build-essential g ++  -  multilib 
  
（运行 dpkg -l | grep libstdc ++ 来得到的libstdc的确切版本++如果上面的失败）
 
I realize that there are several duplicates like this but none of them have worked for me so far. 
I am trying to compile a C++ very simple program on Ubuntu using g++ but it is giving me scope errors.
#include <iostream>
using namespace std;

int main()
{
  cout << "Hello world";
}
This gives me this error:
sudo g++ -v test.c
test.c: In function ‘int main()’:
test.c:7:3: error: ‘cout’ was not declared in this scope
I also tried defining the scope as many other posts say, but that also didn't work, but gave me a different error:
#include <iostream>

int main()
{
  std::cout << "Hello world";
}
Gives error:
test.c: In function ‘int main()’:
test.c:6:3: error: ‘cout’ is not a member of ‘std’
Most of the suggestions online suggest "using namespace std;", "#include " and "std::cout". 
So I tried all 3 together, still no luck :(
#include <iostream>
using namespace std;

int main()
{
  std::cout << "Hello world";
}
gives error:
test.c: In function ‘int main()’:
test.c:7:3: error: ‘cout’ is not a member of ‘std’




I have gone through several forums online but none of them seem to work for me :( 

This is a part of a bigger issue because of which one of my linux make doesn't work.

Btw, I am using g++ and not gcc as a few posts messed up.



EDIT 1:

I changed the name to .cpp, and execute without sudo. Here is the verbose output:
pranoy@pranoyubuntu1210:~/Desktop/SIP/SIPp/sipp-3.3$ g++ -v test.cpp -o test
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.2-2ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) 
COLLECT_GCC_OPTIONS='-v' '-o' 'test' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1plus -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE test.cpp -quiet -dumpbase test.cpp -mtune=generic -march=x86-64 -auxbase test -version -fstack-protector -o /tmp/cczzibvL.s
GNU C++ (Ubuntu/Linaro 4.7.2-2ubuntu1) version 4.7.2 (x86_64-linux-gnu)
    compiled by GNU C version 4.7.2, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.7
 /usr/include/c++/4.7/x86_64-linux-gnu
 /usr/include/c++/4.7/backward
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
GNU C++ (Ubuntu/Linaro 4.7.2-2ubuntu1) version 4.7.2 (x86_64-linux-gnu)
    compiled by GNU C version 4.7.2, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 521527ea42f0901bf839bcaad0cb13e6
test.cpp: In function ‘int main()’:
test.cpp:5:3: error: ‘cout’ is not a member of ‘std’

解决方案
What you've written works absolutely fine on my Ubuntu system, with the same version of g++.

It sounds like you haven't installed all of the necessary files for the C++ environment, or something isn't quite right with it. Try this:
$ sudo apt-get remove g++ libstdc++-6.4.7-dev
$ sudo apt-get install build-essential g++-multilib
(Run dpkg -l | grep libstdc++ to get the exact version of libstdc++ if the above fails)

                        
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