Question: What is a friend function? How is it useful? Explain static data variable. Distinguish a static data and a global data. What is a container

What is a friend function? How is it useful? Explain static data variable. Distinguish a static data and a global data. What is a container class? Explain with examples.

Explain the use of this pointer. Why are constant pointers deployed? Explain the context under which constant pointer to constant object can be deployed.

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