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Never mix malloc with delete OR new with free

Never mix malloc with delete OR new with free as the outcome will be undefined behavior. It is not a good programming practice.

Let's look at the two undefined behavior due to the mixed usage of malloc with delete OR new with free and learn how to overcome it:

* malloc with delete (attached mallocdel.cpp) - In this case, memory is allocated with malloc and it is freed using delete or delete[].

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