Beginner C++ question
Author
I''m new to C++ and have a question. I''m making a simple game engine and want each part to be in different source files. The only problem is I don''t know how to use variables and functions from a seperate source file in another source file. Can anybody help me. Thanks in advance.
hmm...i think i might get your drift
in file1.cpp make something like
extern int somenumber;
then you should be able to call it from another file
or maybe you should just use the #include "file.h" directive
in file1.cpp make something like
extern int somenumber;
then you should be able to call it from another file
or maybe you should just use the #include "file.h" directive
Author
I tried the #include "file.h" directive but i get variable already declared errors but i''ll try the extern keyword.
if you want to make a global variable there are two steps:
put the variable in a header file with extern
put the variable in a source file without extern
then simply include the header where you need to.
put the variable in a header file with extern
put the variable in a source file without extern
then simply include the header where you need to.
I had that poblem too:
first create a header file for your variables, something like
"MyVars.h"
in your main module, write
#include "myvars.h"
This is the code for your MyVars header:
Now, you should be able to use the myfirstvar integer variable in
your main module...
Good Luck with your programming,
Edited by - pentium3id on January 1, 2002 11:50:20 PM
first create a header file for your variables, something like
"MyVars.h"
in your main module, write
#include "myvars.h"
This is the code for your MyVars header:
#ifndef myvarsh_abdg23 //this prevents "alredy defined" errors#define myvarsh_abdg23 // use any string after ifndefextern int myfirstvar; // your variable#endif // this is at end of ile, after all code Now, you should be able to use the myfirstvar integer variable in
your main module...
Good Luck with your programming,
[Hugo Ferreira][Positronic Dreams][]
"Research is what I'm doing when I don't know what I'm doing."
- Wernher Von Braun (1912-1977)
Edited by - pentium3id on January 1, 2002 11:50:20 PM
Use extern. It does what it sounds like: "externalizes" the variable. Declare it in one file with extern and you can use it in other files (without the extern).
This topic is closed to new replies.
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