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3.11: Why functions?

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  • It may not be clear why it is worth the trouble to divide a program into functions. There are several reasons:

    • Creating a new function gives you an opportunity to name a group of statements, which makes your program easier to read and debug.
    • Functions can make a program smaller by eliminating repetitive code. Later, if you make a change, you only have to make it in one place.
    • Dividing a long program into functions allows you to debug the parts one at a time and then assemble them into a working whole.
    • Well-designed functions are often useful for many programs. Once you write and debug one, you can reuse it.
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