Code page seems to be broken

I wrote a simple cpp code ‘program.cpp’, encoding in utf8, for only printing a chinese string:

#include<iostream>
int main()
{
    std::cout << "哈哈哈哈哈哈" << std::endl;
    return 0;
}

But it actually printed a wrong string:

> g++ .\program.cpp
>  .\a.exe
鍝堝搱鍝堝搱鍝堝搱

cmd & powershell

The current code page of cmd or powerhsell is 936-gbk. But I can use chcp 65001 to solve this problem:

>a.exe
鍝堝搱鍝堝搱鍝堝搱

>type program.cpp
#include<iostream>
int main()
{
    std::cout << "鍝堝搱鍝堝搱鍝堝搱" << std::endl;
    return 0;
}

Active code page: 65001

>a.exe
哈哈哈哈哈哈

>type program.cpp
#include<iostream>
int main()
{
    std::cout << "哈哈哈哈哈哈" << std::endl;
    return 0;
}

pwsh

The current code page is 65001-utf8. I cannot get correct chinese strings printed, and chcp 65001 doesn’t work.

> .\a.exe
鍝堝搱鍝堝搱鍝堝搱
> cat .\program.cpp
#include<iostream>
int main()
{
    std::cout << "哈哈哈哈哈哈" << std::endl;
    return 0;
}

Active code page: 65001
> .\a.exe
鍝堝搱鍝堝搱鍝堝搱
> cat .\program.cpp
#include<iostream>
int main()
{
    std::cout << "哈哈哈哈哈哈" << std::endl;
    return 0;
}

Environment data

zh-cn win10.

> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.0.3
PSEdition                      Core
GitCommitId                    7.0.3
OS                             Microsoft Windows 10.0.18363
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[DHowett]

(If your application requires a specific codepage to be active, it should set it itself. It is almost always incorrect to rely on the global state of the console, because it will rarely be what you want.)

[iSazonov]

If this c# program will automatically set the codepage itself, why it fails if global codepage is ascii?

Your program does not set a code page. https://stackoverflow.com/questions/45575863/how-to-print-utf-8-strings-to-stdcout-on-windows

<div>Stack Overflow</div><div>How to print UTF-8 strings to std::cout on Windows?</div><div>I'm writing a cross-platform application in C++. All strings are UTF-8-encoded internally. Consider the following simplified code:

#include <string> #include <iostream>

int main() { …</div>