C++ global variables appear before any function

#include <iostream>
using namespace std;
do_fun();//  w w w .  java 2 s  .  c  om
third_fun();  // Prototype discussed later.
int main()
{
   cout << "No variables defined in main() \n\n";
   do_fun();                   // Call the first function.
   return 0;
}
float sales, profit;              // Two global variables.
do_fun()
{
   sales = 20000.00;        // This variable is visible from this point down.
   profit = 5000.00;        // As is this one. They are both global.
   cout << "The sales in the second function are " << sales << "\n";
   cout << "The profit in the second function is " << profit << "\n\n";
   third_fun();          // Call the third function to show that globals are visible.
   return 0;
}
third_fun()
{
   cout << "In the third function: \n";
   cout << "The sales in the third function are " << sales << "\n";
   cout << "The profit in the third function is " << profit << "\n";
   return 0;
}