//4.2 - Variable Scope Example - Mark Lee - Prima Publishing
#include <iostream>
using namespace std;

int subtract (int a, int b);

int global = 5;  

int main(void)
{
     int a, b;
     a = 5;
     b = 3;
     cout << "The value of main's a is: " << a << endl
          << "The value of main's b is: " << b << endl
          << "The value of global is: " << global << endl;
     global = 2 + subtract(a,b);
     cout << "The value of main's a now is: " << a << endl
          << "The value of global now is: " << global << endl;
     return 0;
}  

int subtract(int a, int b)
{
     cout << "The value of subtract's a is: " << a << endl
          << "The value of subtract's b is: " << b << endl;
     a = a - b + global;
     return a;
}