Question

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.

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. 

code is in python

Answer 1

highway_number = int(input())
if highway_number >= 1 and highway_number <= 99:
    if highway_number % 2 == 0:
        print("I-"+str(highway_number)+" is primary, going east/west.")
    else:
        print("I-"+str(highway_number)+" is primary, going north/south.")
elif highway_number >= 100 and highway_number <= 999:
    n = highway_number % 100
    if n % 2 == 0:
        print("I-"+str(highway_number)+" is auxiliary, serving I-"+str(n)+", going east/west.")
    else:
        print("I-"+str(highway_number)+" is auxiliary, serving I-"+str(n)+", going north/south.")
else:
    print(str(highway_number)+" is not a valid interstate highway number.")