// Example 3.6. Example of functions using a global variable

#include <iostream>

using namespace std;

int i;                      // global

int main()
{
   void modifyI();

   i = 1;                   // global i is assigned 1

   cout << "Before calling modifyI, i equals " << i << endl;
   modifyI();
   cout << "After calling modifyI, i equals " << i << endl;

   return 0;
}


//
// Function modifies global i
// Pre:  i is a global integer variable.
// Post: Global variable i has been assigned 3.
//

void modifyI()
{
   i = 3;                  // global i is assigned 3
}