access to a variable from different files

[markitus]

hello... i know this is quite a beginner question. well, i explain my problem. i would like to access to one variable (p.e. int x) defined in a file (p.e. myprogramApp.cpp) from another file (p.e. myprogramView.cpp).. could anyone tell me how could i declare that variable, and how to get access to it from another file???
i hope it's possible.

thank u very much.

 

[xwb]

Method 1: put the variable in a header and declare it as extern. Include the header in both files. Then properly declare it in one of the source files.

Method 2: put the variable in a header and declare it as extern. Include the header in both files. Create a third file where the variable is declared.

Method 2 may not work on some compilers. The fussier older ones like some code in the source: they really moan if you just have declarations.

 

[drewdaman]

i like method 1 above.

also, if you are using classes and your var is a private member, you can use getters and setters.