I got red underline on "#include " using C++

Question

I don't know why I got red underline on #include <iostream>. I use VSCode for IDE and C/C++ has installed. My code is very basic but I don't know why it still have red underline.

My code :

#include <iostream>    //This line got red underline.
using namespace std;

int main() {
    cout << "Hello";
    retern 0;
}

While it run.

[Running] cd "c:\Users\hola\Desktop" && g++ testplusplus.cpp -o testplusplus && "c:\Users\hola\Desktop"testplusplus 'g++' is not recognized as an internal or external command, operable program or batch file.

[Done] exited with code=1 in 0.05 seconds

You have two unrelated errors. The second error is caused by `g++` not being in the PATH. The first one is a false positive, it's solely a VSC problem and wouldn't stop you from running the program. I think if you hover the error, it explains how it can be fixed. — HolyBlackCat, Sep 05 '21 at 17:19
@Mayur I did't even know what is g++. I think I didn't installed g++. — Schwann, Sep 05 '21 at 17:23
`g++` is c++ compiler. You need to install one of compiler to compile your c++ programs — Mayur, Sep 05 '21 at 17:24
you can do a bit google to know how to install C++ compiler in windows/linux and how to configure C++ settings in vscode — Mayur, Sep 05 '21 at 17:25
The compiler that provides the `g++` command is called MinGW, or GCC. There are many distributions of varying quality, [here's a decent installation guide](https://stackoverflow.com/questions/30069830/how-to-install-mingw-w64-and-msys2). — HolyBlackCat, Sep 05 '21 at 17:34
Have you followed the [installation instructions?](https://code.visualstudio.com/docs/languages/cpp) — Alan Birtles, Sep 05 '21 at 18:45

score 2 · Accepted Answer · answered Sep 05 '21 at 18:42

'g++' is not recognized as an internal or external command, operable program or batch file.

This is because the g++ compiler is not installed (and/or not added to the PATH environment variable, this will probably help you). MinGW is the GCC (GNU Compiler Collection) adaptation for Windows, and thus should be used.

Concerning the preprocessor directive #include <iostream> there are some rare occasions where IDEs and underlying compile-time processes return a false-positive (It could happen on any line in the file).

I got red underline on "#include " using C++

1 Answers1