Chapter 2 – Speaking C#

What type would you choose for the following "numbers"?

1. A person's telephone number

   string

2. A person's height

   float or double

3. A person's age

   int for performance or byte (0 to 255) for size

4. A person's salary

   decimal

5. A book's ISBN

   string

6. A book's price

   decimal

7. A book's shipping weight

   float or double

8. A country's population

   uint (0 to about 4 billion)

9. The number of stars in the universe

   ulong (0 to about 18 quadrillion) or System.Numerics.BigInteger (allows an arbitrarily large integer)

10. The number of employees in each of the small or medium businesses in the UK (up to about 50,000 employees per business)

    Since there are hundreds of thousands of small or medium businesses, we need to take memory size as the determining factor so choose ushort because it only takes 2 bytes compared to an int, which takes 4 bytes.