Problem 2

Write a PhoneNumber class that gets initialized with a 10-digit phone number. In the call PhoneNumber.new(ph), the input phtake any of these possible formats:

 

• a 10-digit integer

 

• a string of 10 digits

 

• (ddd) ddd-dddd where d is any digit [parenthesis format]

 

• ddd-ddd-dddd where d is any digit [hyphen format]

 

Wherever whitespace appears in a string format, we can have a string of zero or more whitespace characters (including before and after the string as a whole). A PhoneNumber object responds to the to_s message which returns the number as a string in parenthesis format, and the area_code, prefix, and root messages which return the parts of the number in string format, as illustrated

 

here:

 

a = PhoneNumber.new(1234567890)

 

puts a # (123) 456-7890 puts a.area_code # 123 puts a.prefix # 456

 

puts a.root # 7890

 

puts PhoneNumber.new(' 7778889999 ') # (777) 888-9999 puts PhoneNumber.new(' (555)444-3333') # (555) 444-3333

 

PhoneNumber.new('1234')

 

# ArgumentError: Improper phone number syntax

 

PhoneNumber.new('(12) 333-4444')

 

# ArgumentError: Improper phone number syntax

 

PhoneNumber.new('123- 456- 7890')

# ArgumentError: Improper phone number syntax