Variables already defined while linking.

I've not written C in quite a while, sorry if I'm looking over something obvious.

Here is camera.h

Code:

float angle=0.0, deltaAngle = 0.0, ratio;
float x=0.0f, y=1.75f, z=5.0f;
float lx=0.0f, ly=0.0f, lz=-1.0f;

int deltaMove = 0;

Then I'm just using

Code:

#include "camera.h"

in each file where I need those variables. However, during link, I get these errors:

keys.obj : error LNK2005: "int deltaMove" (?deltaMove@@3HA) already defined in camera.obj
keys.obj : error LNK2005: "float lz" (?lz@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float ly" (?ly@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float lx" (?lx@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float z" (?z@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float y" (?y@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float x" (?x@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float deltaAngle" (?deltaAngle@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float angle" (?angle@@3MA) already defined in camera.obj
keys.obj : error LNK2005: "float ratio" (?ratio@@3MA) already defined in camera.obj
render.obj : error LNK2005: "int deltaMove" (?deltaMove@@3HA) already defined in camera.obj
render.obj : error LNK2005: "float lz" (?lz@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float ly" (?ly@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float lx" (?lx@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float z" (?z@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float y" (?y@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float x" (?x@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float deltaAngle" (?deltaAngle@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float angle" (?angle@@3MA) already defined in camera.obj
render.obj : error LNK2005: "float ratio" (?ratio@@3MA) already defined in camera.obj

To surpress any confusion, camera.h is included in camera.cpp, keys.cpp and render.cpp

Please help, I'm quite clueless to the issue. :/

Post all your include statements in all your files. List the include statements next to the file name in which they appear. Don't forget the file with main() in it.

Variables should not be defined in a header file. Variables should only be defined once. They can be declared multiple times. C FAQ. Defining a variable sets aside space and optionally provides an initial value. Declaring a variable simply provides the compiler with the name and type of the variable. No space is set aside.

Declare your variables in the header file like this:

Code:

extern float angle, deltaAngle, ratio;
extern float x, y, z;
extern float lx, ly, lz;

extern int deltaMove;

Then, in one cpp file, define your global variables:

Code:

float angle=0.0, deltaAngle = 0.0, ratio;
float x=0.0f, y=1.75f, z=5.0f;
float lx=0.0f, ly=0.0f, lz=-1.0f;

int deltaMove = 0;