//Demonstrating a call to a function.
  #include <iostream.h>

 // function Demonstration Function
 // prints out a useful message
 void DemonstrationFunction()
 {
 cout << "In Demonstration Function\n";
 }

 // function main - prints out a message, then
 // calls DemonstrationFunction, then prints out
 // a second message.
 int main()
 {
 cout << "In main\n" ;
 DemonstrationFunction();
 cout << "Back in main\n";
 return 0;
 }