for each, for_each, for auto - concept clean

Clean up the concept through below examples.

1. normal method : for, iterator

2. for auto loop

3. for each loop

4. for_each

refer to this example

It would be better if I could handle the parallel loop.
This is next time.

Thank you.

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two types of check sum function

First is intel method.
Second is motorora method.

Check sum used to check for packet confidence in serial communication.

refer to this below code