\[ \begin{align}\begin{aligned}\newcommand\blank{~\underline{\hspace{1.2cm}}~}\\% Bold symbols (vectors) \newcommand\bs[1]{\mathbf{#1}}\\% Poor man's siunitx \newcommand\unit[1]{\mathrm{#1}} \newcommand\num[1]{#1} \newcommand\qty[2]{#1~\unit{#2}}\\\newcommand\per{/} \newcommand\squared{{}^2} % % Scale \newcommand\milli{\unit{m}} \newcommand\centi{\unit{c}} \newcommand\kilo{\unit{k}} \newcommand\mega{\unit{M}} % % Angle \newcommand\radian{\unit{rad}} \newcommand\degree{\unit{{}^\circ}} % % Time \newcommand\second{\unit{s}} % % Distance \newcommand\meter{\unit{m}} \newcommand\m{\meter} \newcommand\inch{\unit{in}} \newcommand\feet{\unit{ft}} \newcommand\mile{\unit{mi}} \newcommand\mi{\mile} % % Volume \newcommand\gallon{\unit{gal}} % % Mass \newcommand\gram{\unit{g}} \newcommand\g{\gram} % % Frequency \newcommand\hertz{\unit{Hz}} \newcommand\rpm{\unit{rpm}} % % Voltage \newcommand\volt{\unit{V}} \newcommand\V{\volt} \newcommand\millivolt{\milli\volt} \newcommand\mV{\milli\volt} \newcommand\kilovolt{\kilo\volt} \newcommand\kV{\kilo\volt} % % Current \newcommand\ampere{\unit{A}} \newcommand\A{\ampere} \newcommand\milliampereA{\milli\ampere} \newcommand\mA{\milli\ampere} \newcommand\kiloampereA{\kilo\ampere} \newcommand\kA{\kilo\ampere} % % Resistance \newcommand\ohm{\Omega} \newcommand\milliohm{\milli\ohm} \newcommand\kiloohm{\kilo\ohm} % correct SI spelling \newcommand\kilohm{\kilo\ohm} % "American" spelling used in siunitx \newcommand\megaohm{\mega\ohm} % correct SI spelling \newcommand\megohm{\mega\ohm} % "American" spelling used in siunitx % % Inductance \newcommand\henry{\unit{H}} \newcommand\H{\henry} \newcommand\millihenry{\milli\henry} \newcommand\mH{\milli\henry} % % Temperature \newcommand\celsius{\unit{^{\circ}C}} \newcommand\C{\unit{\celsius}} \newcommand\fahrenheit{\unit{^{\circ}F}} \newcommand\F{\unit{\fahrenheit}} \newcommand\kelvin{\unit{\K}} \newcommand\K{\unit{\kelvin}}\\% Power \newcommand\watt{\unit{W}} \newcommand\W{\watt} \newcommand\milliwatt{\milli\watt} \newcommand\mW{\milli\watt} \newcommand\kilowatt{\kilo\watt} \newcommand\kW{\kilo\watt} % % Torque \newcommand\ozin{\unit{oz}\text{-}\unit{in}} \newcommand\newtonmeter{\unit{N\text{-}m}}\end{aligned}\end{align} \]

Apr 16, 2025 | 243 words | 2 min read

8.2.2. Phone Number Converter

Many companies use telephone numbers like \(555\text{-GET-FOOD}\) so that the number is easier for customers to remember. On a standard telephone, the alphabetic letters are mapped to numbers as shown in Table 8.3.

Table 8.3 Keypad letter mapping.

Numbers	Letters
\(2\)	A,B, and C
\(3\)	D,E, and F
\(4\)	G,H, and I
\(5\)	J,K, and L
\(6\)	M,N, and O
\(7\)	P,Q,R, and S
\(8\)	T,U, and V
\(9\)	W,X,Y, and Z

Write a new function named convert_number that takes a phone number string such as \(555\text{-GET-FOOD}\) as its only argument and returns the telephone number with any alphabetic characters that appeared in the original translated into their numeric equivalent. For example, if the argument is \(555\text{-GET-FOOD}\), the function should return \(555\text{-}438\text{-}3663\). Make sure the function can handle input with both upper and lower case characters.

In your main function, collect a phone number from the user, use your convert_number function to convert it to its numeric equivalent, and then print the results as shown in the sample output.

Sample Output

Use the values in Table 8.4 below to test your program.

Table 8.4 Test Cases

Case	Phone Numbers
1	555-GET-FOOD
2	555-New-Cars
3	555-Flowers

Ensure your program’s output matches the provided samples exactly. This includes all characters, white space, and punctuation. In the samples, user input is highlighted like this for clarity, but your program should not highlight user input in this way.

Case 1 Sample Output

$ python3 phone_number_converter_login.py Enter a telephone number: 555-GET-FOOD 555-GET-FOOD 555-438-3663

Case 2 Sample Output

$ python3 phone_number_converter_login.py Enter a telephone number: 555-New-Cars 555-New-Cars 555-639-2277

Case 3 Sample Output

$ python3 phone_number_converter_login.py Enter a telephone number: 555-Flowers 555-Flowers 555-3569377

Deliverables

Save your finished program as phone_number_converter_login.py, replacing login with your Purdue login. Then submit it along with all the deliverables listed in Table 8.5 below.

Table 8.5 Deliverables

Deliverable	Description
phone_number_converter_login.py	Your finished program.
Screenshot(s)	PNG(s) capturing all 3 test cases.