#include <iostream>
  
// function Demonstration Function
// prints out a useful message
void DemonstrationFunction()
{
   std::cout << "In Demonstration Function\n";
}
  
// function main - prints out a message, then
// calls DemonstrationFunction, then prints out
// a second message.
int main()
{
    std::cout << "In main\n" ;
    DemonstrationFunction();
    std::cout << "Back in main\n";
    return 0;
}