92: Mainline

The following program computes the volume of a box car:

#include  
main ( ) { 
  cout << "The volume of the box car is " << 11 * 9 * 40 << endl; 
} 

Of course, if you propose to compute the volumes of many box cars, of varying length, you certainly should define a volume-computing function, perhaps named box_car_volume, to do the work:

#include 
// Definition of box_car_volume function will go here
main ( ) {
  cout << "The volume of the box car is "
       << box_car_volume (11, 9, 40)  
       << endl; 
} 

In this example, the box_car_volume function has three arguments—11, 9, and 40. As illustrated, C++ requires function arguments to be separated by commas.