After installing and following the instructions for GMP (using mingw64 since I am on windows) and verifying the installation was correct using make check I tried running the following code in VSCode using the command g -g \path\file.cpp -lgmpxx -lgmp -o \path\file.exe:

#include <gmp.h>
#include <iostream>

using namespace std;

int main()
{
    mpz_class a,b,c;
    cout << "Hello World\n";
    a = 1234;
    b = "5678";
    c = a b;
    return 0;
}

But get the error error: 'mpz_class' was not declared in this scope. So the include path in VSCode is incorrectly set up or the installation was messed up. I am wondering how to fix this: is this VSCode's includePath (compilerPath is not set up), an installation issue (I could not determine the default install location for windows systems since everything I found was for Linux), or is there something else I missed? I saw a flag for ./configure that was --enable-cxx but I wanted to ask before running make clean and retrying with that flag turned on since it takes forever.

I feel like this is something dead simple since I cannot find any help from googling.

Thank you for any help!

EDIT: I have tried running the code not in VSCode and it still has the same issue so I am not so sure it's VSCode.

CodePudding user response：

I don't know anything about GMP, but you seem to include the wrong header.

#include <gmpxx.h> worked for me.