WHAT YOU WILL LEARN IN THIS CHAPTER:
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A function is something that performs a particular task. Take a pocket calculator as an example. It performs lots of basic calculations, such as addition and subtraction. However, many also have function keys that perform more complex operations. For example, some calculators have a button for calculating the square root of a number, and others even provide statistical functions, such as the calculation of an average. Most of these functions could be done with the basic mathematical operations of add, subtract, multiply, and divide, but that might take a lot of steps—it’s much simpler for the user if she only needs to press one button. All she needs to do is provide the data—numbers in this case—and the function key does the rest.