C++ MQCs with Explanation (CHAPTER : POINTERS, VIRTUAL FUNCTIONS AND POLYMORPHISM )

Identy the error in the following code segment int *ptr, m = 100; // line 1 cout << *ptr; //line 2

1. Declaring ptr and m in one line is wrong
2. In line 2, *ptr should be written as &ptr
3. The address of m should be assigned to ptr before it is accessed
4. No error

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Answer: 

Option c: The address of m should be assigned to ptr before it is accessed

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Explanation Here