====== Global Variables ======

Global variables are variables that are declared outside the scope of a function.  While it is common, even encouraged, to declare global constants, global variables are problematic as program size increases.  Because of this, the use of global variables should be limited.

<code c++>

#include <iostream>

using namespace std;

// count is a global variable.  This should be avoided.
int count;

// MAX_SIZE is a global constant.  This is not a problem.
const int MAX_SIZE {10};

int main() {
  ...
}
</code>

You should not use global variables unless you are given permission to do so by your instructor.