GIGO: Garbage In, Garbage Out
Input and output are closely related; a program’s output depends on the input received. Thus, if a program receives garbage data as input, it will produce garbage as an output. In kittenbook, we ask users for their name and then (foolishly?) assume that they are actually going to enter their real name. If it’s not their real name, we assume that they will at least provide a real name, or something that looks remotely like a name. But the text box we provide is free form, and our users can enter whatever characters they want. They could enter their address, their favorite movie quote, a math equation, or even some malicious code. If anything but a name is entered, the output won’t make any sense: Hello, Do, or do ...
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