int x = 10;
int y = 20;
int z = x + y;.webp){kind=logo}
Ask the right questions to secure the right C++ talent among an increasingly shrinking pool of talent.
C++ is a high-level, general-purpose programming language, created by Bjarne Stroustrup at Bell Labs in 1979. It was developed as an extension of the C language, with additional features such as classes and objects, supporting the concept of object-oriented programming. C++ has been widely adopted in software engineering and is used for a variety of tasks, including system/software development and game programming. Its efficiency and flexibility have made it one of the most popular languages in the world. The language has been standardized by the International Organization for Standardization (ISO), with its latest version being C++20.
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
'This' is a keyword in C++ which is a pointer that points to the object which invokes the member function.
A function pointer can be declared and used like this: 'int (*funcPtr)(int,int);' This declares a pointer to a function that takes two integers as argument and returns an integer. You can assign a function to this pointer using 'funcPtr = &func;', where 'func' is a predefined function.
In C++, the primary difference between a class and a structure is the default access level. For a class, members are private by default, while for a structure, they are public.
C++ supports several types of inheritance: single, multiple, multilevel, hierarchical, and hybrid inheritance.
You would use the asterisk (*) symbol to declare a pointer in C++. For example, 'int* p;' declares a pointer to an integer.
This is important because it provides evidence of the candidate's capabilities and gives an insight into how they work on real-world projects.
This is critical because the field of software development is constantly evolving and successful developers need to be able to keep up with new technologies and techniques.
This would be beneficial as it would reduce the amount of training needed and allow the candidate to contribute more quickly.
This is vital because developers often need to collaborate with others and explain their work to non-technical stakeholders.
This is important because programming often involves solving complex problems and the ability to do so effectively is a key skill for a developer.
This is essential because the candidate needs to have a deep understanding of the language to be able to design and implement efficient software.
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
'Delete' is an operator in C++ which deallocates memory and calls the destructor for the object, while 'free' is a function in C that just deallocates memory without calling the destructor.
A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function.
C++ provides a mechanism to detect and handle runtime anomalies or exceptions. You can use the 'try', 'catch', and 'throw' keywords to work with exceptions. You wrap the code that could potentially throw an exception inside a 'try' block, and handle the exception in a 'catch' block.
Templates are a feature of the C++ programming language that allows functions and classes to operate with generic types. This allows a function or class to work on many different data types without being rewritten for each one.
Overloading refers to having multiple functions with the same name but different parameters, while overriding refers to a subclass providing a different implementation for a function that already exists in its superclass.
A skilled C++ engineer should demonstrate proficiency in understanding and using advanced C++ concepts, problem-solving abilities, and debugging skills. Red flags include over-reliance on libraries without understanding their workings, lack of knowledge about memory management or inability to explain complex algorithms or data structures.
int x = 10;
int y = 20;
int z = x + y;for(int i = 0; i < 5; ++i)
{
std::cout << i;
}int arr[5] = {1, 2, 3, 4, 5};
int sum = 0;
for(int i = 0; i < 5; ++i)
{
sum += arr[i];
}#include
void foo()
{
// do something
}
int main()
{
std::thread t(foo);
t.join();
} class MyClass
{
public:
int x;
MyClass(int val) : x(val) {}
};
int main()
{
MyClass obj(10);
std::cout << obj.x;
}int x = 0;
try
{
if(x == 0)
throw x;
x = 1/x;
}
catch(int e)
{
std::cout << 'Error';
}The final few interview questions for a C++ candidate should typically focus on a combination of technical skills, personal goals, growth potential, team dynamics, and company culture.
A singleton class can be implemented by making the constructor private, and creating a static method that creates the instance only if it doesn't already exist. This ensures that only one instance of the class can be created.
'New' is an operator in C++ which allocates memory and calls the constructor for the object, while 'malloc' is a function in C that just allocates memory without calling the constructor.
A copy constructor is a member function which initializes an object using another object of the same class.
Polymorphism in C++ can be implemented through the use of virtual functions. A base class pointer can point to objects of any of its subclasses, and when a virtual function is called through this pointer, the corresponding function in the derived class gets executed.
Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.
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