c++ interview questions: 43 C++ Interview Questions To Prepare for Your Interview

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    2023-04-29T15:00:20+00:00
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    c++ interview questions: 43 C++ Interview Questions To Prepare for Your Interview

    Introduction

    In this post, we will provide some sample C++ interview questions that you can use to prepare for your interview. The questions are divided into different sections, which are as follows:

    Section: C++ Interview Questions and Answers

    Section: What is the difference between static and dynamic memory allocation?

    Section: What is a virtual function?

    Section: What is a base class pointer?

    Section: What is the difference between a const reference parameter and a const object parameter in C++?

    C++ Interview Questions and Answers

    C++ is a general purpose programming language. It is used to create low level code, high level code and system software. C++ is also used to create applications, games and other software applications.

    What is the difference between static and dynamic memory allocation?

    Dynamic memory allocation is when the memory is allocated at runtime. This is faster than static memory allocation because it doesn’t have to be compiled into the program, but it can also be less efficient because you don’t know how much space you need until you actually run the program.

    Static memory allocation means that your program has been compiled with all of its variables (like ints and floats) assigned specific locations in memory by default when it starts running. This makes static variables faster than dynamic ones because they don’t need any extra work from your CPU during execution; however, if those locations aren’t big enough for what you want them for then this could cause problems down the line!

    What is a virtual function?

    A virtual function is a function that can be overridden in a derived class. It allows you to create polymorphic behavior, which means that the same function call can have different results depending on which object it’s applied to. For example, let’s say you have an Employee class and an Accountant subclass of it:

    • The Accountant class has its own version of calculateSalary(), so when you call calculateSalary() on an Accountant object, this will run the Accountant version instead of the base Employee version.
    • You could also override getName(), setName() and other methods in your derived classes if they differ from those defined in their base classes (in this case, Employee).

    What is a base class pointer?

    A base class pointer is a pointer that can be used to access members and call methods of its base class. A derived class object cannot be accessed through a base class pointer, but you can use them to call methods on the base class.

    The following example shows how you would declare, initialize and use a base class pointer:

    // Declare an object of type Person with no initial values

    Person *p = nullptr; // Declare another object of type Person with initial values

    // Initialize p with an address in memory where we want our first person stored at runtime (the second argument)

    p = new Person(); // Now let’s do some things with our person object!

    What is the difference between a const reference parameter and a const object parameter in C++?

    • Const reference parameter is a reference to const object.
    • Const object parameter is a copy of const object

    Explain what is meant by recursive function. How can one make sure that it works correctly?

    Recursive functions are functions that call themselves. It’s important to make sure that recursive functions work correctly, and there are a few things you should do to make sure this happens.

    First, test your recursive function on different inputs. If it works properly for all inputs (and there are no special cases), then you can be confident in its use.

    Second, make sure that the termination condition is correct; if not, then your program will never stop calling itself and will either crash or run forever!

    Is there any limit on the number of arguments that can be passed to a function? If yes, what are they?

    There is no limit to the number of arguments that can be passed to a function. However, it’s important to remember that some compilers will only allow you to pass six arguments at most. If you need more than six because your function does something complicated with its parameters (like return values), then you will have to use a std::vector or some other type of container class instead of simple arrays and pointers:

    The following code example shows how this works:

    Explain why it is not possible to have two methods with the same name defined in the same class.

    You can’t have two methods with the same name defined in the same class. This is because there can only be one definition of a method, and if there are two definitions, it will cause problems when you try to compile your code. That’s because the compiler won’t know which version of your method to use!

    The simplest way I’ve found to explain this is that C++ uses static linking (as opposed to dynamic linking). In other words: when you call a function or method from another file (or library), your program looks through all of its source code and finds every place where that function or method is called; then it creates an internal table with all those locations listed as offsets into memory where these references were found; finally when execution reaches one such reference location during runtime it jumps directly over into memory at exactly that offset point where everything needed by that particular call resides ready for execution immediately after returning control back up through whatever layers may have contained some callers before reaching our current caller level–this process happens very quickly so we don’t even notice any lag between pressing ENTER key on keyboard and seeing results coming back from our console window screen display area!

    Explain how you would implement priority queues using STL containers such as vector, list and deque. In your explanation, explain why you decided on these containers over stack or heap APIs. Also mention at least one way of implementing stack using these data structures.

    Priority queues are data structures that provide a way to store elements and access them in sorted order.

    We will use STL containers, such as vector, list and deque for implementing priority queues.

    • In your explanation, explain why you decided on these containers over stack or heap APIs. Also mention at least one way of implementing stack using these data structures.

    These questions will help you understand whether or not you are ready for an interview.

    These questions are from an interview.

    These questions are from a book.

    These questions are from a website.

    Conclusion

    If you are looking for a job in C++, then these questions can be very helpful. They will help you understand whether or not you are ready for an interview and also give some insight into what type of questions might be asked during one.

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