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By Owen L. Astrachan

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Additional info for A Computer Science Tapestry: Exploring Programming and Computer Science with C++ (2nd edition)

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Collect the exams from the boxes in order (00–99). This method will work correctly. Try to modify the method to work with four-digit ID numbers and six-digit ID numbers. In making the modification, assume you have only 100 boxes. 7 illustrate the design, development, realization, and implementation of a computer program to multiply two numbers. Consider the following problem: Develop a recipe for a chocolate cake with chocolate icing that tastes delicious and makes you swoon. Develop analogs or parallels to the steps 1–7 for developing such a recipe.

2 Using Components As an example of how software components might be useful, consider digital clocks, the display on a CD player, a car’s odometer, and a counter for web-page hits. All of these devices require the display of numerals that are manipulated in some fashion. The numerals displayed are different according to how the device is used: Clocks display time; the numerals represent hours, minutes, seconds. CD players display information on how many tracks are available on a CD (some also display time).

One of the reasons that computers get less expensive every year is that the pieces that make up a computer get cheaper as more are produced—this is sometimes called economy of scale. Viewed differently, the key is not to do all the work yourself but to use what others provide. Of course, off-the-shelf components don’t always work. A roof of a birdhouse is different from the roof of the house you live in even though both share some common characteristics. It would be very useful to be able to order a standard roof, but then to be able to customize it easily to fulfill your specific needs.

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