C++ MQCs with Explanation (CHAPTER 6: CONSTRUCTORS AND DESTRUCTORS)

A constructor for the class Area having two data members length and breadth is declared as followsArea (int length = 15, int breadth = 10); Which one of the following object declarations is illegal?

1. Area A(20, 10);
2. Area A();
3. Area A = Area (20, 10);
4. Area A;

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Answer: 

Option d: Area A;

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Explanation Here