C# 0 The Complete Reference

AreaPerPerson( )

 that displays the 

area-per-person for a building:

// Add a method to Building.

using System;

class Building {

  public int Floors;    // number of floors

  public int Area;      // total square footage of building

  public int Occupants; // number of occupants

  // Display the area per person.

  public void AreaPerPerson() {

    Console.WriteLine("  " + Area / Occupants + " area per person");

  }

}

// Use the AreaPerPerson() method.

class BuildingDemo {

  static void Main() {

    Building house = new Building();

    Building office = new Building();

    // Assign values to fields in house.

    house.Occupants = 4;

    house.Area = 2500;

    house.Floors = 2;

    // Assign values to fields in office.

    office.Occupants = 25;

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    office.Area = 4200;

    office.Floors = 3;

    Console.WriteLine("house has:\n  " +

                      house.Floors + " floors\n  " +

                      house.Occupants + " occupants\n  " +

                      house.Area + " total area");

    house.AreaPerPerson();

    Console.WriteLine();

    Console.WriteLine("office has:\n  " +

                      office.Floors + " floors\n  " +

                      office.Occupants + " occupants\n  " +

                      office.Area + " total area");

    office.AreaPerPerson();

  }

}

This program generates the following output, which is the same as before:

house has:

  2 floors

  4 occupants

  2500 total area

  625 area per person

office has:

  3 floors

  25 occupants

  4200 total area

  168 area per person

Let’s look at the key elements of this program, beginning with the