A Programming Excercise

By Daniel Miessler on October 11th, 2005: Tagged as Programming | Python

My buddy and I dabble in some Python and he stumbled across this little puzzle for novice coders. You can do it in any language, but we opted for Python. Anyway, here’s how I solved it:

reverse.py

Ken’s code was a lot more Perl’esque, i.e. it had more power per line. I’ll post a link to his when he makes it available.

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Carl M

If I am reading your code correctly, it finds ONE magic number for each of the numbers from 2 to 9. (This is in fact what the instructions required.) But, my question is: Are the answers unique? Extend that question a little bit … for an integer, i, from 1 to 9 (note that I started at 1), how many six digit numbers have the property that they are equal to their digit reversal when multiplied by i? PERHAPS the answer is that there is only one such six digit number for each of the numbers from 2 to 9, but there are certainly MANY when i=1. How many?
Carl M

If I am reading your code correctly, it finds ONE magic number for each of the numbers from 2 to 9. (This is in fact what the instructions required.) But, my question is: Are the answers unique? Extend that question a little bit … for an integer, i, from 1 to 9 (note that I started at 1), how many six digit numbers have the property that they are equal to their digit reversal when multiplied by i? PERHAPS the answer is that there is only one such six digit number for each of the numbers from 2 to 9, but there are certainly MANY when i=1. How many?
http://kenswain.com/ Ken

You comments are kinds D, but my code was getting complex fast. I think this is the most elegant solution to the problem.

BTW I did find one piece on the challenge site that looked like mine in python, but was almost 40 lines when it was done. WAY TO GO DUDE!
http://kenswain.com Ken

You comments are kinds D, but my code was getting complex fast. I think this is the most elegant solution to the problem.

BTW I did find one piece on the challenge site that looked like mine in python, but was almost 40 lines when it was done. WAY TO GO DUDE!

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