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Showing posts from September, 2018

A Tale Of Two Sundials

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It was the best of times, it was the worst of times, ... it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair ... With apologies to Charles Dickens, I am writing about two sundials on Cornell's campus. One is outside Goldwin Smith Hall in the Arts Quad while the other is in the Engineering Quad.

Tools Of The Trade

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"Like many artists, I am very attached to my brushes. I love them all individually and I’m very familiar with their individual characteristics. I can distinguish between brushes of the same make, series and size. I know their degree of spring, their shape, their balance, and, most importantly of all, the marks I can make with each of them."

This was the opening paragraph from an article on Artists and Illustrators.  I'm no artist, but I felt an instant kinship.  Developers -- the passionate ones -- care about their tools in the same way.

A good computer configuration would include a fast multi-core cpu with two 24" displays.  Dual monitors were fantastic, letting me code on one display and allowing me to read email or web pages on the other.  They became less fantastic when I began to code on both displays.  The angles between the monitors were awkward and the frame separating them was distracting.  A single large monitor became more suitable, and I found 27" i…

The C Programming Language, Part 3

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I found C easy to pick up.  Yet, it had the wonderful property in that the more you used the language, the more there was to learn.

The book in the middle with the red title -- The C Answer Book -- provided solutions to the exercises presented in The C Programming Language (topmost book).  It was neatly done, and kept pace with the concepts presented in the source material.  Depending on how you learn, the answer book can be useful.  Back in the day, before the internet matured, it certainly was.  Today, it's not as essential because sample code abounds.

The book at the bottom was the second edition of The C Programming Language and described the ANSI standard.  A new one on Amazon sold for about $60, which made my first edition quite the bargain.  Emphasizing C's main strength, and at the same time, acknowledging a major source of difficulty, K&R expanded Chapter 5: Pointers and Arrays with diagrams of how memory was organized, how arrays were imagined, and how pointers …

The C Programming Language, Part 2

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The leftmost book was a first edition, and it beckoned me, sometime around 1984, from the shelves of Barnes & Nobles.  Priced at $17.95, the book was a significant out-of-pocket expense for someone on their first job, but it would prove to be quite the investment.

Turning to the Introduction, I noticed it was denoted as Chapter 0. This was a delightful self-reference to the C language itself, where arrays started with an index of 0, instead of 1.  Think of it as an elevator that marks the ground floor as "G" and the next floor up as "1."

C's array and pointer capabilities were what made the language especially powerful, compact, clear, and efficient, but it also took discipline to use them right.  Pointers let you access memory, but sloppy use can take your pointer to bad places, leading to security holes, and ultimately crashing your program.

One technique I've used to corral stray pointers was to set them null after I was done with them.  It was stil…