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) goeast/west. Auxiliary highways are numbered 100-999, and service theprimary highway indicated by the rightmost two digits. Thus, I-405services I-5, and I-290 services I-90. Note: 200 is not a validauxiliary highway because 00 is not a valid primary highwaynumber.

Given a highway number, indicate whether it is a primary orauxiliary highway. If auxiliary, indicate what primary highway itserves. Also indicate if the (primary) highway runs north/south oreast/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. 

See Wikipedia for more info on highway numbering.

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LAB ACTIVITY

4.16.1: LAB: Interstate highway numbers

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