Use a global variable : global variable « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » global variable

1.5.1.Use a global variable

#include <iostream>

using namespace std;



void func1();

void func2();



int count; // This is a global variable.



int main()

{

  int i; // This is a local variable



  for(i=0; i<10; i++) {

    ::count = i * 2;

    func1();

  }



  return 0;

}



void func1()

{

  cout << "count: " << ::count; // access global count

  cout << '\n';

  func2();

}



void func2()

{

  int count;



  for(count=0; count<3; count++)

     cout << '.';

}

count: 0
...count: 2
...count: 4
...count: 6
...count: 8
...count: 10
...count: 12
...count: 14
...count: 16
...count: 18
...

1.5.global variable
	1.5.1.	Use a global variable
	1.5.2.	Global class variable
	1.5.3.	Global variables are known throughout the entire program and may be used by any piece of code.
	1.5.4.	Use :: to reference global variable

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