problem with my c++ project!!!

Hi
im new to programming. i couldnt solve the following problem.
A plane is moving on x axis.
For example it moves to (5000,0) than (6000,0). I wrote a functions to calculates fuel.
....
....
man->MinusX( man->GetX() ); ......1
man->Setfuel( man->GetMinX()/man->GetHiz()*man->Getfuelconst() );.....2
mane->Addfuel( man->Getfuel() ); .....3
...
...

void Man:MinusX(float a){SetMinX(a - minx);}
...
...
my problem is;if plane moves forward than backwards 2 dont calculates fuel correctly.
I want to implant a simple solution bu i couldnt find it.


Thanks.

A few notes if you want help with your code.

1) Use code tags that will make your code much easier to read.
2) Tell us what your functions do. What is man, what is mane?

Here's a hint:

fabs

Thanks.
fabs() solved my problem.

Now one thig left. Im using Dev-C++ and i couldnt find a way to enable Turkish encoding.
The project is a console app. I tried to Visual Studio 2005 with the same project. I pu t header files to Headers directory and .cpp files to Source directory.
After build it gives lots of errors:

error C2653: 'Car' : is not a class or namespace name
error C2065: 'fuel' : undeclared identifier
error C3861: 'totalfuel: identifier not found
.
.
.

Erm... does it work WITHOUT "Turkish encoding"? It's hard for us to guess when you've posted errors and no code.