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Every time LabTool starts, it waits for the host computer to send it the firmware to execute.
We can use an invariant to help us reason about a piece of code that many programmers find hard to get right by any other means.
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Possibly the worst sin of calling malloc is that it might take a very long time to complete.
We can think of an invariant as being a claim or belief about the state of program that we expect to be true each time control reaches a particular point in the program.