4.16 LAB: Interstate highway numbers

4.16 LAB: Interstate highway numbers

Primary U.S. interstate highways are numbered 1-99. Odd numbers (like the 5 or 95) go north/south, and evens (like the 10 or 90) go east/west. Auxiliary highways are numbered 100-999, and service the primary highway indicated by the rightmost two digits. Thus, I-405 services I-5, and I-290 services I-90. Note: 200 is not a valid auxiliary highway because 00 is not a valid primary highway number.

Given a highway number, indicate whether it is a primary or auxiliary highway. If auxiliary, indicate what primary highway it serves. Also indicate if the (primary) highway runs north/south or east/west.

Ex: If the input is:

90
the output is:

I-90 is primary, going east/west.
Ex: If the input is:

290
the output is:

I-290 is auxiliary, serving I-90, going east/west.
Ex: If the input is:

0
the output is:

0 is not a valid interstate highway number.
Ex: If the input is:

200
the output is:

200 is not a valid interstate highway number.

Complete Answer:

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