CODEWITHSUNDEEP
c++classheader
user3087101
user3087101

Reputation: 54

C++ variable that can be used in any file of the project

I am making a C++ project with the main.cpp which has main function, then a header file header.h and a cpp file program.cpp which has class methods in it. So I wanted to ask is there a way to declare a variable that i would use in main.cpp and methods could read it in program.cpp ?

Upvotes: 0

Views: 69

Answers (2)

Paul Evans
Paul Evans

Reputation: 27577

Global variables are discouraged in general, but you can do this simply with the following in your header file:

extern my_global_type myGlobal;

you then define myGlobal in main.cpp as:

my_global_type myGlobal = \* some init value *\;

and simply use it in program.cpp by including the header with the above extern. You can make it a bit less global (but not get rid of all the problems) by putting myGlobal in a namespace.

Upvotes: 2

Lightness Races in Orbit
Lightness Races in Orbit

Reputation: 385204

Yes.

Look up the extern keyword in your C++ book.

Upvotes: 4

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