OSDev.org

Posted: **Mon Oct 20, 2008 1:29 am**

Hello folks,

I had many experiences around mixing languages
e.g.
qbasic <-> assembly
qbasic <-> pascal
c++ -> qbasic
c++ <-> assembly

but i failed to make mix between qbasic & C++ ( C++ <- qbasic )
i think there is one method to do that,
declare qbasic function as pascal in c++

in qbasic

Code: Select all

 function addone%(n as integer)
             addone%= n + 1
 end function

& i compiled qbasic code & generate qbtst.OBJ

in C++

Code: Select all

 extern "C"{
  int pascal addone(int);
 }

main(){
 int  foo;
  foo=addone(3);//foo must be 4
}

finally, link all .OBJ files
and compiler say:

Linker Error: Undefined symbol addone in module F:\mix.CPP

need your comments

ThankX

Cheers,
Ahmad T. Dajani

Posted: **Mon Oct 20, 2008 3:56 am**

I don't know anything about QBasic, but I'd use objdump to list the symbols from both object files. It might be as simple as a missing underscore.

Posted: **Mon Oct 20, 2008 4:49 am**

Indeed, name mangling is probably your problem. If you're using GCC you could use the -fno-leading-underscore option to GCC to make the names compatible.

Posted: **Mon Oct 20, 2008 8:27 am**

It's nice to experiment but I'm not sure I see the reason behind all of this. If you want something more low-level than C++, there's C (also Pascal), which you already managed. Both C and Pascal support stuff like GOTOs, etc.

Posted: **Mon Oct 20, 2008 8:46 am**

WELL,

I got a library for qbasic "3d4qb.lib" i think

This lib include many functions around 3d (scale,rotate,...)

it's hard to start like this project form scratch since i want only some
functions from that lib in my C code

so, i decide to disassemble it,& i do it ,but huge library like this in assembly langauge is terrible to understand,isn't it

thanX again

Posted: **Mon Oct 20, 2008 9:16 am**

You may consider to write your code against Direct3D's math library instead. And there probably are many more libraries that do math stuff for you.

I see no real need for quickbasic other than it being totally outdated.

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Mixing: Qbasic & C++

Mixing: Qbasic & C++

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