I tried my code this day and then I come to one problem.. how to use same int variabel in different cpp files? i have seen people writing extern int?? if i want to read in one file if for example int hello is larger than 10 and int hello is declared in a different file... extern or what?

common.h

#ifndef COMMON_H#define COMMON_Hextern int common;void some_func();#endif

file1.cpp

#include "common.h"int common; //this line can appear in any cpp fileint main(){  common = 32;  some_func();  return 0;}

file2.cpp

#include "common.h"void some_func(){   cout << common << endl;}

The output is 32.

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oki... thanx it works fine..

but when i shift scene now the text that displays looks
messed up... it blinks ?