To protect my computer form hacking and save my files
<span>To reduce chances of system failure, engineers may use process control. This is a system which involves activities that ensures the whole process variables can be predicted and controlled to prevent failure. This involves the use of safety valves and sensors.</span>
Answer:
The most common use of symbols by programmers is for performing language reflection (particularly for callbacks), and most common indirectly is their use to create object linkages. In the most trivial implementation, they have essentially named integers (e.g. the enumerated type in C).
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