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In computer programming, a temporary variable is a variable with short lifetime, usually to hold data that will soon be discarded, or before it can be placed at a more permanent memory location. Because it is short-lived, it is usually declared as a local variable, i.e., a variable with local scope.
Most functions only contain two or three variables, so a long name is unnecessary.
Variables are so important to the code that they deserve a good name that accurately describes their purpose. Sometimes a bad name can be the difference between a fellow developer understanding what everything does at first glance and not having any clue where to begin. It's likely that we've all been there.
No other characters are permitted in the variable name. Specifically, spaces are not permitted in the variable names, as variable name must be a single word. Variable name may not start with a digit or underscore, and may not end with an underscore. Double underscores are not permitted in variable name.
Whenever i put up a code for review from professional programmers they tend to point out that "using a variable named temp is bad" but no one seems to know why.
Why is it considered bad ?
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