And select some sub modules from each main module to test them and ensure the normal operation of the system. In the process of system design, there will inevitably be some errors. For the expression syntax error, it will be automatically prompted when the program is running, and it needs to be corrected immediately, so it is easier to find and repair this type of error. But another type of error is the result of a wrong operation or a logical error in the formula used to calculate some data during program execution. This type of error is very hidden, sometimes it seems, sometimes it doesn't appear, so it takes a lot of time and effort to investigate this type of dynamic error.<br>
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