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Silly CAPTCHA
   

I was registering for access to the Sencha forums (www.sencha.com) today when I saw the following on the registration form:

Figure 1

That's pretty advanced math for a CAPTCHA, isn't it?

So, is the math problem this:

6 – (2 x 3)

Or is it this:

(6 – 2 ) x 3

Having a degree in Physics and more than 30 years of experience as a professional software developer, I was certain I knew what I was doing. However, I'd be lying if I told you I got this right on the first try.

All of my years of experience with math told me that the actual problem I was trying to solve was this: 6 – (2 x 3). Everything I knew from high school and college told me that without parenthesis clarifying the problem, the more complicated math happened first followed by less complicated. Even Wikipedia confirmed this here: http://en.wikipedia.org/wiki/Order_of_operations.

The answer's Zero, right?

Nope, that's not the case. So, not only is the registration forum asking me to do more complicated math than simple addition, subtraction or multiplication – but it's also scoffing at normal precedence of operators and essentially forcing me to give the deliberately wrong answer which, according to them, is 12.



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http://www.johnwargo.com/index.php/Miscellaneous/silly-captcha.html
Feb 08, 2012
69 hits



Recent Blog Posts
128


When to Check for Updates
Mon, Aug 11th 2014 7:12a   John Wargo
I’ve been trying to build a sample application using Ionic, an HTML5 framework specifically designed for hybrid applications. I read the instructions, downloaded the code and initiated the command to create a new project. What happened? Failure. I posted my issue on their forum only to be told that my Cordova development environment must be old. I explained that it was all up to date and working perfectly for every other Cordova development I’ve ever done and what I got for my trouble was [read] Keywords: application applications development
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Thu, Jul 31st 2014 5:15p   John Wargo
Whenever I publish a book with my publisher, they always pick one chapter and post it online for anyone to read. Picking the right chapter has always been a challenge for me because I want them to publish a chapter that’s interesting enough to make you want to buy the book while at the same time not being so good that you get everything you need and don’t buy the book. Get it? Please buy my books. I write them because I like to write and think I have a special skill when it comes to describ [read] Keywords: development mobile
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Sun, Jul 13th 2014 7:12a   John Wargo
Print copies of Apache Cordova API Cookbook arrived on Friday; my expectation is that they will be available for shipment from Amazon.com and other retailers by the end of next week. This book, along with my Apache Cordova 3 Programming, provide 600 pages of coverage for Apache Cordova. These two books give mobile developers everything they need to be able to write cross-platform mobile applications using Apache Cordova or Adobe PhoneGap. [read] Keywords: applications mobile
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I was poking around on Amazon yesterday and noticed that the Kindle edition of Apache Cordova API Cookbook was published back in June. You can get your copy immediately using the following link: http://www.amazon.com/gp/product/B00LB6X2SO/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00LB6X2SO&linkCode=as2&tag=mcnsof-20&linkId=AXKNHCPITM4FNLNK. [read] Keywords:
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187


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Mon, Jun 30th 2014 6:10a   John Wargo
I mentioned this on twitter a while back, but I’m consistently amazed by how much effort is made by hackers to hack into my personal web sites. I’d be really interested in seeing what percentage of internet traffic is taken up by these efforts. I plan on doing some analysis of this, but simply haven’t gotten to it. Anyway, I had some issues with the CAPTCHA on this site, and my comments plugin provider isn’t responding to any forum posts on the topic so I had to just leave the comments [read] Keywords: bug twitter
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Tue, Feb 11th 2014 7:11a   John Wargo
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Tue, Feb 4th 2014 7:12a   John Wargo
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