C++ LANGUAGE SUPPORT.CPP PAGE 37

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C++ LANGUAGE SUPPORT.CPP

 
Second File: support.cpp 


#include <iostream> 
  
extern int count; 
  
void write_extern(void) 
{ 
   std::cout << "Count is " << count << std::endl; 
} 
Here, extern keyword is being used to declare count 
in another file. Now compile these two files as follows: 
$g++ main.cpp support.cpp -o write 
This will produce write executable program, try to execute 
write and check the result as follows: 

$./write 
5