Ans. External variables are declared outside all functions,i.e. in the beginning of the program file. As all the functions will be defined after these variables declarations , so these variables are visible to all functions in a program file .
1. Write the shorts notes on Garbage collection. Ans. Garbage collection in C++ isn't native to the language; it relies on manual memory management using constructs like new and delete . However, some third-party libraries or smart pointers like std::shared_ptr and std::unique_ptr offer automated memory management. C++11 introduced smart pointers, reducing manual memory handling but lacking the automatic garbage collection found in languages like Java or Python. 2. What is multiple heritance? Ans. Multiple inheritance in C++ enables a class to inherit attributes and behaviors from more than one base class. It allows a derived class to access features from multiple parent classes, fostering complex class hierarchies but potentially causing issues like the diamond problem due to ambiguous member access. 3. What do you mean by operator overloading ? Ans. Operator overloading in C++ allows defining custom behaviors for operators like +, -, *, etc., for user-defined types. It enable
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