11-Section-Handout

# How to drive from jerrys house in san francisco to

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how to drive from Jerry’s house in San Francisco to Stanford campus: +Francisco,+CA+94114&daddr=Stanford+University,+Stanford,+CA +94305&hl=en&geocode=&mra=ls&sll=37.596475,- 122.301758&sspn=0.35472,0.831528&ie=UTF8&ll=37.597912,- 122.305984&spn=0.354712,0.831528&z=11 While Google Maps is no doubt an awesome product, that URL is a little overwhelming, particularly if you have to drop it into an email and expect all the recipients to cut and paste that to a browser. It also makes it difficult to drop the link into your Facebook or Twitter status, particularly when Twitter limits you to 140 characters. TinyURL allows you to enter a long, nasty URL like this, and maps it to a much simpler URL that can be shared with others more easily. TinyURL now maps the above to this: This tiny URL is effectively the same as the larger one. TinyURL manages the correlation for you. See the trailing dzsoq4 ? You may not immediately see it this way, but that’s actually a number—a base-36 number. TinyURL uses that number behind to scenes to find the original URL so it can fetch the right page for you. Write two functions: TinyURLConvertNumber and TinyURLRecoverNumber . The first one accepts a positive integer and generates the base-36 equivalent, and the second does the opposite. In base 36 land, 0 – 9 correspond to 0 – 9, and a – z correspond to 10 – 35: these are the digits of a base 36 counting system.

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