Introduction

1. The property is a condominium
2. The property has one story

If we find a condo, since all of our condos have only one level, the criterion set by the customer is true. Even if we were considering another (type of) property, it wouldn't matter. This can be resumed in the following table:

The other properties would not be considered, especially if they have more than one story:

To check for either of two conditions, in Boolean algebra, you can use an operator called OR. We can show this operation as follows:

In Boolean algebra, this type of comparison is performed using the OR operator. In C#, the OR operator is performed using the || operator. Here is an example:

using System;

public enum HouseType
{
    Unknown,
    SingleFamily,
    Townhouse,
    Condominium
}

class Program
{
    static void Main()
    {
        HouseType type = HouseType.Unknown;
        int choice;
        int stories = 1;

        Console.WriteLine("Enter the type of house you want to purchase");
        Console.WriteLine("1. Single Family");
        Console.WriteLine("2. Townhouse");
        Console.WriteLine("3. Condominium");
        Console.Write("You Choice? ");
        choice = int.Parse(Console.ReadLine());

        if (choice == 1)
            type = HouseType.SingleFamily;
        if (choice == 2)
            type = HouseType.Townhouse;
        if (choice == 3)
            type = HouseType.Condominium;

        Console.Write("How many stories? ");
        stories = int.Parse(Console.ReadLine());

        Console.WriteLine("\nDesired House Type: {0}", type);
        Console.WriteLine("Number of Stories:  {0}", stories);

        if ((type == HouseType.Condominium) || (stories == 1))
            Console.WriteLine("\nDesired House Matched");
        else
            Console.WriteLine("\nThe House Doesn't Match the Desired Criteria");
    }
}

Here is an example of running the program:

Enter the type of house you want to purchase
1. Single Family
2. Townhouse
3. Condominium
You Choice? 3
How many stories? 6

Desired House Type: Condominium
Number of Stories:  6

Desired House Matched
Press any key to continue . . .

Suppose that, among the properties our real estate company has available, there is no condominium. In this case, we would then consider the other properties:

If we have a few single family homes, we would look for one that has only one story. Once we find one, our second criterion becomes true:

This can be illustrated in the following run of the above program:

Enter the type of house you want to purchase
1. Single Family
2. Townhouse
3. Condominium
You Choice? 1
How many stories? 1

Desired House Type: SingleFamily
Number of Stories:  1

Desired House Matched
Press any key to continue . . .

If we find a condo and it is one story, both criteria are true. This can be illustrated in the following table:

The following run of the program demonstrates this:

Enter the type of house you want to purchase
1. Single Family
2. Townhouse
3. Condominium
You Choice? 3
How many stories? 1

Desired House Type: Condominium
Number of Stories:  1

Desired House Matched
Press any key to continue . . .

A Boolean OR operation produces a false result only if BOTH conditions ARE FALSE:

Here is another example of running the program:

Enter the type of house you want to purchase
1. Single Family
2. Townhouse
3. Condominium
You Choice? 2
How many stories? 2

Desired House Type: Townhouse
Number of Stories:  2

The House Doesn't Match the Desired Criteria
Press any key to continue . . .

As opposed to evaluating only two conditions, you may face a situation that presents three of them and must consider a combination of more than two conditions.