There is a very subtle difference in the following: int *myarray[10] v’s int (*myarray)[10] The first declaration is interpreted as an array of 10 integers, that are pointers. That is you have 1 array holding 10 pointers that are of type integer. The square brackets have a higher precedence so the myarray[10] gets defined first.… Read More »
Learning about pointers in C is no mean feat. It may seem logical and obvious to the well trained but to the beginner or newbie, it is a challenge and a half. Not only that but trying to find good material on learning about C pointers is tricky as well. There is too much information… Read More »
There’s been a lot made of the recent Dick Smith Electronic debacle. It has changed so much since the 90’s when I use to go in and buy electronic kit sets. Looking for a bargain recently I looked at the website and came across something interesting. These cables are advertised for $14.99 at 50% off.… Read More »
A wonderful book that was given to me back in 2013. Took me 3 years of procrastination before reading it. Highly recommend reading. Full of truisms and relatable stories.
I was researching on what “dnl” meant within a configure.ac file and my Google search showed results from http://www.gnu.org/software/m4/manual/m4-1.4.14/html_node/Dnl.html. Thinking this was the authoritative source, upon reading, I couldn’t for the life of me understand it. After searching some more, it was explained very clearly and succinctly at Stack Overflow of all places. http://stackoverflow.com/questions/3371239/autoconf-dnl-vs In configure.ac, lines commented with… Read More »
Viewing variable values via gdb of a va_list is not as straight forward as gdb> p myvar. It requires a few extra steps not only in execution but in understanding. Read on if you want to know how va_* works and how to view the underlying variables. Step 1: The first step is to understand… Read More »
For some reason I was re-reading a particular section in a book called Mastering Bitcoin by Andreas M. Antonopoulos (http://chimera.labs.oreilly.com/books/1234000001802) and came across this paragraph: This means that a valid block for height 277,316 is one that has a block header hash that is less than the target. In binary that number would have more than the… Read More »
Have you seen the “at” symbol twice with numbers in between? The double at symbols (@@) are known as chunk symbols and is part of the “Unified Format”. You can probably deduce it to some extent by looking at the graphics below: It basically tells you which lines have changed and the range or number… Read More »
The full title is actually: The Age of Cryptocurrency: How Bitcoin and Digital Money Are Challenging the Global Economic Order. Excellent reading. 300 odd pages of delightful insight on the past, present and future. Recommend reading
Introduction If you’ve spent some time reading up on the fundamentals of bitcoins and the block chain but felt it was way over your head, here it is from another angle. Reading the likes of: https://en.bitcoin.it/wiki/Block https://en.bitcoin.it/wiki/Transaction https://en.bitcoin.it/wiki/Block_hashing_algorithm https://en.bitcoin.it/wiki/Protocol_documentation can be a bit daunting so I’ve created some pretty pictures instead. The secret sauce at… Read More »