1) Give detailed answer: A)What are the pointers and dynamic arrays?  How to declare them?   b)What is vector?  What is array?  What are the difference in between them?   c)What is Container class?  How do we declare one?

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Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.