In computer jargon, an error is referred to as a bug. In case you are interested in the origin of this word, the story goes that when operating the first large-scale digital computer, called the Mark I, an error was traced to a moth that had found its way into the hardware. Incidentally, the Mark I (circa 1944) had 750,000 parts, was 51 feet long, and weighed over five tons. How about putting that on your desktop? It also executed about one instruction every six seconds, as compared to over 200 million instructions per second for a Pentium!

Errors can be grouped into three types based on when they occur—design time, compile time, or run time.

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